(self.webpackChunk_N_E=self.webpackChunk_N_E||[]).push([[847],{6355:function(e,n,i){(window.__NEXT_P=window.__NEXT_P||[]).push(["/enterance_exam/chemistry",function(){return i(9060)}])},9060:function(e,n,i){"use strict";i.r(n),i.d(n,{default:function(){return s}});var o=i(5893),t=i(7294),a=i(6640),r=i(9634),c=[{question:"Calculate the number of grams $H_2SO_4$ needed to make 200mL of 0.200$MH_2SO_4$.",name:"questionunknown0",type:"radio",unit:"unit_0",choices:[{label:"(a) 4.92",id:"qunknown0_a",is_correct:!1},{label:"(b) 1.92",id:"qunknown0_b",is_correct:!1},{label:"(c) 2.92",id:"qunknown0_c",is_correct:!1},{label:"(d) 3.92",id:"qunknown0_d",is_correct:!0},],answer:"d"},{question:"What percent is gold in 18 karat gold?",name:"questionunknown1",type:"radio",unit:"unit_0",choices:[{label:"(a) 25%",id:"qunknown1_a",is_correct:!1},{label:"(b) 18%",id:"qunknown1_b",is_correct:!1},{label:"(c) 89%",id:"qunknown1_c",is_correct:!1},{label:"(d) 75%",id:"qunknown1_d",is_correct:!0},],answer:"d"},{question:"What is the concentration of a solution in parts premillion, if 0.02g of $Na_3PO_4$ is dissolved in 1000g of water?",name:"questionunknown2",type:"radio",unit:"unit_0",choices:[{label:"(a) 0.2ppm",id:"qunknown2_a",is_correct:!1},{label:"(b) 20ppm",id:"qunknown2_b",is_correct:!0},{label:"(c) 0.0ppm",id:"qunknown2_c",is_correct:!1},{label:"(d) 2ppm",id:"qunknown2_d",is_correct:!1},],answer:"b"},{question:"A fraction $10^{12}$ represents a prefix",name:"questionunknown3",type:"radio",unit:"unit_0",choices:[{label:"(a) Giga",id:"qunknown3_a",is_correct:!1},{label:"(b) Mega",id:"qunknown3_b",is_correct:!1},{label:"(c) Tera",id:"qunknown3_c",is_correct:!0},{label:"(d) Pico",id:"qunknown3_d",is_correct:!1},],answer:"c"},{question:"Which one is used as a unit of time for long time interval?",name:"questionunknown4",type:"radio",unit:"unit_0",choices:[{label:"(a) Hour",id:"qunknown4_a",is_correct:!0},{label:"(b) Microsecond",id:"qunknown4_b",is_correct:!1},{label:"(c) Second",id:"qunknown4_c",is_correct:!1},{label:"(d) Millisecond",id:"qunknown4_d",is_correct:!1},],answer:"a"},{question:"Which of the following is not intensive properties?",name:"questionunknown5",type:"radio",unit:"unit_0",choices:[{label:"(a) Colour",id:"qunknown5_a",is_correct:!1},{label:"(b) Conductivity",id:"qunknown5_b",is_correct:!1},{label:"(c) Odor",id:"qunknown5_c",is_correct:!1},{label:"(d) Area",id:"qunknown5_d",is_correct:!0},],answer:"d"},{question:"What is the exothermic step in a solution of $CaCL_2$ in water?",name:"questionunknown6",type:"radio",unit:"unit_0",choices:[{label:"(a) Separation of the water molecules",id:"qunknown6_a",is_correct:!1},{label:"(b) Hydration (solvation) of the ions from the salt",id:"qunknown6_b",is_correct:!0},{label:"(c) Separation of the salt into in gaseous state",id:"qunknown6_c",is_correct:!1},{label:"(d) Separation of the salt into ion in gaseous state and separation of the water.",id:"qunknown6_d",is_correct:!1},],answer:"b"},{question:"What is the most important type of solute-solvent interaction in a solution of ammonia in water?",name:"questionunknown7",type:"radio",unit:"unit_0",choices:[{label:"(a) Hydrogen bonding",id:"qunknown7_a",is_correct:!0},{label:"(b) Ion-dipole",id:"qunknown7_b",is_correct:!1},{label:"(c) London-dispersion force",id:"qunknown7_c",is_correct:!1},{label:"(d) Dipole-dipole",id:"qunknown7_d",is_correct:!1},],answer:"a"},{question:"A concise verbal statement or mathematical equation that summarizes a broad variety of observation is",name:"questionunknown8",type:"radio",unit:"unit_0",choices:[{label:"(a) Law",id:"qunknown8_a",is_correct:!0},{label:"(b) Theory",id:"qunknown8_b",is_correct:!1},{label:"(c) Observation",id:"qunknown8_c",is_correct:!1},{label:"(d) Hypothesis",id:"qunknown8_d",is_correct:!1},],answer:"a"},{question:"In which of the following period of the periodic table is an element with atomic number 20 placed?",name:"questionunknown9",type:"radio",unit:"unit_0",choices:[{label:"(a) 4",id:"qunknown9_a",is_correct:!0},{label:"(b) 2",id:"qunknown9_b",is_correct:!1},{label:"(c) 3",id:"qunknown9_c",is_correct:!1},{label:"(d) 1",id:"qunknown9_d",is_correct:!1},],answer:"a"},{question:"How many spectral lines are emitted form a hydrogen atom excited to the state designated by the principal quantum number, n= 3?",name:"questionunknown10",type:"radio",unit:"unit_0",choices:[{label:"(a) 4",id:"qunknown10_a",is_correct:!1},{label:"(b) 1",id:"qunknown10_b",is_correct:!1},{label:"(c) 2",id:"qunknown10_c",is_correct:!1},{label:"(d) 3",id:"qunknown10_d",is_correct:!0},],answer:"d"},{question:"Hydrogen atoms are existed to the stationary state designated by the principal quantum number, n=4. What will be the number of line (frequencies) emitted by the hydrogen atoms?",name:"questionunknown11",type:"radio",unit:"unit_0",choices:[{label:"(a) 16",id:"qunknown11_a",is_correct:!1},{label:"(b) 6",id:"qunknown11_b",is_correct:!1},{label:"(c) 4",id:"qunknown11_c",is_correct:!0},{label:"(d) 1",id:"qunknown11_d",is_correct:!1},],answer:"c"},{question:"Which one of the following electromagnetic radiation has the longest wavelength?",name:"questionunknown12",type:"radio",unit:"unit_0",choices:[{label:"(a) Radio waves",id:"qunknown12_a",is_correct:!0},{label:"(b) X-rays",id:"qunknown12_b",is_correct:!1},{label:"(c) Gamma rays",id:"qunknown12_c",is_correct:!1},{label:"(d) Microwaves",id:"qunknown12_d",is_correct:!1},],answer:"a"},{question:"Natural copper consists of $^{63}Cu$ and $^{65}Cu$ what is the percentage abundance of $^{63}Cu$ if the average mass of Cu is 63.5?",name:"questionunknown13",type:"radio",unit:"unit_0",choices:[{label:"(a) 50%",id:"qunknown13_a",is_correct:!1},{label:"(b) 33%",id:"qunknown13_b",is_correct:!1},{label:"(c) 25%",id:"qunknown13_c",is_correct:!1},{label:"(d) 75%",id:"qunknown13_d",is_correct:!0},],answer:"d"},{question:"During the titration of known volume of a strong acid with a strong base, there is",name:"questionunknown14",type:"radio",unit:"unit_0",choices:[{label:"(a) A steady increase in PH",id:"qunknown14_a",is_correct:!1},{label:"(b) A sharp increase in PH around the end point",id:"qunknown14_b",is_correct:!0},{label:"(c) A sharp decrease in PH around the end point",id:"qunknown14_c",is_correct:!1},{label:"(d) A steady decrease in PH",id:"qunknown14_d",is_correct:!1},],answer:"b"},{question:"A solution with a PH of 7.5 would be described as:",name:"questionunknown15",type:"radio",unit:"unit_0",choices:[{label:"(a) Very acidic",id:"qunknown15_a",is_correct:!1},{label:"(b) Slightly acidic",id:"qunknown15_b",is_correct:!1},{label:"(c) Very basic",id:"qunknown15_c",is_correct:!1},{label:"(d) Slightly base",id:"qunknown15_d",is_correct:!0},],answer:"d"},{question:"A beaker filled to the 100mL mark with salt (the salt has a mass of 100g) and another beaker to the 100mL mark with water (the water has a mass of 100g) are mixed together in a bigger beaker until the salt is completely dissolved. What will be the mass of the solution?",name:"questionunknown16",type:"radio",unit:"unit_0",choices:[{label:"(a) It will be exactly 200g",id:"qunknown16_a",is_correct:!0},{label:"(b) It will be much smaller than 200g",id:"qunknown16_b",is_correct:!1},{label:"(c) It will be slightly more than 200g",id:"qunknown16_c",is_correct:!1},{label:"(d) It will be much more than 200g",id:"qunknown16_d",is_correct:!1},],answer:"a"},{question:"Which one of the following is NOT an intensive property?",name:"questionunknown17",type:"radio",unit:"unit_0",choices:[{label:"(a) Color",id:"qunknown17_a",is_correct:!1},{label:"(b) Mass",id:"qunknown17_b",is_correct:!0},{label:"(c) Density",id:"qunknown17_c",is_correct:!1},{label:"(d) Temperature",id:"qunknown17_d",is_correct:!1},],answer:"b"},{question:"Which of the following is natural polymer?",name:"questionunknown18",type:"radio",unit:"unit_0",choices:[{label:"(a) PVC",id:"qunknown18_a",is_correct:!1},{label:"(b) Cotton",id:"qunknown18_b",is_correct:!0},{label:"(c) Nylon",id:"qunknown18_c",is_correct:!1},{label:"(d) Dacron",id:"qunknown18_d",is_correct:!1},],answer:"b"},{question:"Which of the following metals from a volatile compound during the extraction process?",name:"questionunknown19",type:"radio",unit:"unit_0",choices:[{label:"(a) Fe",id:"qunknown19_a",is_correct:!1},{label:"(b) Ni",id:"qunknown19_b",is_correct:!0},{label:"(c) Co",id:"qunknown19_c",is_correct:!1},{label:"(d) Cu",id:"qunknown19_d",is_correct:!1},],answer:"b"},{question:"Which of the following metals is NOT obtained by commercial electrolytic process?",name:"questionunknown20",type:"radio",unit:"unit_0",choices:[{label:"(a) Na",id:"qunknown20_a",is_correct:!1},{label:"(b) Al",id:"qunknown20_b",is_correct:!1},{label:"(c) Ag",id:"qunknown20_c",is_correct:!0},{label:"(d) Cu",id:"qunknown20_d",is_correct:!1},],answer:"c"},{question:"Which of the following metals has the highest electrical and thermal conductivities?",name:"questionunknown21",type:"radio",unit:"unit_0",choices:[{label:"(a) Co",id:"qunknown21_a",is_correct:!1},{label:"(b) Cu",id:"qunknown21_b",is_correct:!1},{label:"(c) Ag",id:"qunknown21_c",is_correct:!0},{label:"(d) Ni",id:"qunknown21_d",is_correct:!1},],answer:"c"},{question:"Enthalpy is defined as the heat content of the system at constant:",name:"questionunknown22",type:"radio",unit:"unit_0",choices:[{label:"(a) Heat",id:"qunknown22_a",is_correct:!1},{label:"(b) Volume",id:"qunknown22_b",is_correct:!1},{label:"(c) Moles",id:"qunknown22_c",is_correct:!1},{label:"(d) Pressure",id:"qunknown22_d",is_correct:!0},],answer:"d"},{question:"Which of the following element is the second most abundant element in the earth’s crust?",name:"questionunknown23",type:"radio",unit:"unit_0",choices:[{label:"(a) Silicon",id:"qunknown23_a",is_correct:!0},{label:"(b) Oxygen",id:"qunknown23_b",is_correct:!1},{label:"(c) Iron",id:"qunknown23_c",is_correct:!1},{label:"(d) Aluminum",id:"qunknown23_d",is_correct:!1},],answer:"a"},{question:"Which of the following plant nutrient will be produced as a result of nitrogen fixation?",name:"questionunknown24",type:"radio",unit:"unit_0",choices:[{label:"(a) Carbohydrate",id:"qunknown24_a",is_correct:!1},{label:"(b) Cellulose",id:"qunknown24_b",is_correct:!1},{label:"(c) Mineral",id:"qunknown24_c",is_correct:!0},{label:"(d) Protein",id:"qunknown24_d",is_correct:!1},],answer:"c"},{question:"What is the number of significant figures in 0.0030050?",name:"questionunknown25",type:"radio",unit:"unit_0",choices:[{label:"(a) 4",id:"qunknown25_a",is_correct:!1},{label:"(b) 8",id:"qunknown25_b",is_correct:!1},{label:"(c) 5",id:"qunknown25_c",is_correct:!0},{label:"(d) 7",id:"qunknown25_d",is_correct:!1},],answer:"c"},{question:"Based on molecular orbital theory, the bond orders of $H_2$, $H_2^+$, and $H_2^-$  are _____, respectively.",name:"questionunknown26",type:"radio",unit:"unit_0",choices:[{label:"(a) 1, 0, and 1/2",id:"qunknown26_a",is_correct:!1},{label:"(b) 1, 1/2, and 1/2",id:"qunknown26_b",is_correct:!0},{label:"(c) 1, 1/2, and 0",id:"qunknown26_c",is_correct:!1},{label:"(d) 1, 0, and 0",id:"qunknown26_d",is_correct:!1},],answer:"b"},{question:"How many 3d electrons are present in the ground state of chromium atom?",name:"questionunknown27",type:"radio",unit:"unit_0",choices:[{label:"(a) 4",id:"qunknown27_a",is_correct:!1},{label:"(b) 5",id:"qunknown27_b",is_correct:!0},{label:"(c) 6",id:"qunknown27_c",is_correct:!1},{label:"(d) 10",id:"qunknown27_d",is_correct:!1},],answer:"b"},{question:"In the following reactions:$\\newline$ $3Cl^-$(aq) + $4CrO_4^{2-}$(aq) + $23H^+$(aq) → $3HClO_2$(aq) + $4Cr^{3+}$(aq) + $10H_2O(l)$ $\\newline$What is the behavior $Cl^-$(aq)?",name:"questionunknown28",type:"radio",unit:"unit_0",choices:[{label:"(a) An acid",id:"qunknown28_a",is_correct:!1},{label:"(b) A base",id:"qunknown28_b",is_correct:!1},{label:"(c) An oxidizing agent",id:"qunknown28_c",is_correct:!1},{label:"(d) A reducing agent",id:"qunknown28_d",is_correct:!0},],answer:"d"},{question:"Devices in which oxidation - reduction reaction is induced by an electric current are called",name:"questionunknown29",type:"radio",unit:"unit_0",choices:[{label:"(a) Voltaic cells",id:"qunknown29_a",is_correct:!1},{label:"(b) Electromotive cells",id:"qunknown29_b",is_correct:!1},{label:"(c) Electrolytic cells",id:"qunknown29_c",is_correct:!0},{label:"(d) Galvanic are called",id:"qunknown29_d",is_correct:!1},],answer:"c"},{question:"2.3g of ethanol $(CH_3CH_2CH)$ is added to 500g of water. What is the molality of the resulting solution?",name:"questionunknown30",type:"radio",unit:"unit_0",choices:[{label:"(a) 0.01m",id:"qunknown30_a",is_correct:!1},{label:"(b) 1.0m",id:"qunknown30_b",is_correct:!1},{label:"(c) 10.0m",id:"qunknown30_c",is_correct:!1},{label:"(d) 0.1m",id:"qunknown30_d",is_correct:!0},],answer:"d"},{question:"During the electrolysis of a concentrated aqueous solution of NaCl, what substance is formed at the cathode?",name:"questionunknown31",type:"radio",unit:"unit_0",choices:[{label:"(a) Sodium",id:"qunknown31_a",is_correct:!1},{label:"(b) Hydrogen",id:"qunknown31_b",is_correct:!0},{label:"(c) Chlorine",id:"qunknown31_c",is_correct:!1},{label:"(d) Oxygen",id:"qunknown31_d",is_correct:!1},],answer:"b"},{question:"In a voltaic cell, electrons flow from the _____ to the ____",name:"questionunknown32",type:"radio",unit:"unit_0",choices:[{label:"(a) Salt bridge, anode",id:"qunknown32_a",is_correct:!1},{label:"(b) Anode, cathode",id:"qunknown32_b",is_correct:!0},{label:"(c) Anode, salt bridge",id:"qunknown32_c",is_correct:!1},{label:"(d) Salt bridge, cathode",id:"qunknown32_d",is_correct:!1},],answer:"b"},{question:"What is the PH of a mixture of 15.0 m L of 0.126M $NaOH$ and 21.0M $H_2SO_4$",name:"questionunknown33",type:"radio",unit:"unit_0",choices:[{label:"(a) 13.60",id:"qunknown33_a",is_correct:!1},{label:"(b) 1.7",id:"qunknown33_b",is_correct:!0},{label:"(c) 2.15",id:"qunknown33_c",is_correct:!1},{label:"(d) 11.81",id:"qunknown33_d",is_correct:!1},],answer:"b"},{question:"Acetylene, $C_2H_2$ reacts with oxygen to produce carbondioxide and water. What is $O_2/C_2H_2$ ration in the balanced equation?",name:"questionunknown34",type:"radio",unit:"unit_0",choices:[{label:"(a) 2/1",id:"qunknown34_a",is_correct:!1},{label:"(b) 3/1",id:"qunknown34_b",is_correct:!1},{label:"(c) 5/2",id:"qunknown34_c",is_correct:!0},{label:"(d) 3/2",id:"qunknown34_d",is_correct:!1},],answer:"c"},{question:"Consider the following half-reactions:$\\newline$ Fe(OH)$_2$(s) + 2e$^-$ $\\to$ Fe(s) + 2OH$^-$(aq), E$^0$ = -0.88v$\\newline$NiO$_2$(s) + 2H$_2$O(l) + 2e$^-$ $\\to$ Ni(OH)$_2$(s) + 2OH$^-$(aq), E$^0$ = 0.49v$\\newline$What is the standard cell potential for the voltaic cell using these electrodes?",name:"questionunknown35",type:"radio",unit:"unit_0",choices:[{label:"(a) -1.37v",id:"qunknown35_a",is_correct:!1},{label:"(b) 0.49v",id:"qunknown35_b",is_correct:!1},{label:"(c) -0.39v",id:"qunknown35_c",is_correct:!1},{label:"(d) 1.37v",id:"qunknown35_d",is_correct:!0},],answer:"d"},{question:"In process known as 'roasting', a(n)_____is chemically converted to a(n) ___.",name:"questionunknown36",type:"radio",unit:"unit_0",choices:[{label:"(a) Sulfide;oxide",id:"qunknown36_a",is_correct:!0},{label:"(b) Carbonate;oxide",id:"qunknown36_b",is_correct:!1},{label:"(c) Oxide;sulfide",id:"qunknown36_c",is_correct:!1},{label:"(d) Phosphate;phosphide",id:"qunknown36_d",is_correct:!1},],answer:"a"},{question:"Which of the following is correct about the heat absorbed by 15kg of water to raise its temperature from 20$^0$c to 50$^0$c at constant pressure? (Cwater = 4.18J/g/C$^o$)",name:"questionunknown37",type:"radio",unit:"unit_0",choices:[{label:"(a) 15kJ",id:"qunknown37_a",is_correct:!1},{label:"(b) 1.88kJ",id:"qunknown37_b",is_correct:!0},{label:"(c) 4.18kJ",id:"qunknown37_c",is_correct:!1},{label:"(d) 30kJ",id:"qunknown37_d",is_correct:!1},],answer:"b"},{question:"How many moles of sodium hydroxide are present in 2.5L of 0.5M aqueous solution?",name:"questionunknown38",type:"radio",unit:"unit_0",choices:[{label:"(a) 1.25mol",id:"qunknown38_a",is_correct:!0},{label:"(b) 3mol",id:"qunknown38_b",is_correct:!1},{label:"(c) 1mol",id:"qunknown38_c",is_correct:!1},{label:"(d) 2.15mol",id:"qunknown38_d",is_correct:!1},],answer:"a"},{question:"What are isotopes? Isotopes are atoms with the same number of protons but different number of",name:"questionunknown39",type:"radio",unit:"unit_0",choices:[{label:"(a) Electrons",id:"qunknown39_a",is_correct:!1},{label:"(b) Ions",id:"qunknown39_b",is_correct:!1},{label:"(c) Neutrons",id:"qunknown39_c",is_correct:!0},{label:"(d) Protons",id:"qunknown39_d",is_correct:!1},],answer:"c"},{question:"Which statement is correct for the emission spectrum of the hydrogen atom?",name:"questionunknown40",type:"radio",unit:"unit_0",choices:[{label:"(a) The line corresponding to the greatest emission of energy is in the ultraviolet region.",id:"qunknown40_a",is_correct:!0},{label:"(b) The lines are produced when electrons move from second to fourth.",id:"qunknown40_b",is_correct:!1},{label:"(c) The lines in the visible region involve electron transitions into the energy level closest to the nucleus.",id:"qunknown40_c",is_correct:!1},{label:"(d) The lines are produced when electrons move from lower to higher energy levels.",id:"qunknown40_d",is_correct:!1},],answer:"a"},{question:"Which of the following states the law of definite proportions?",name:"questionunknown41",type:"radio",unit:"unit_0",choices:[{label:"(a) The total mass in universe is always constant.",id:"qunknown41_a",is_correct:!1},{label:"(b) The mass of the products in chemical reaction must be equal to the mass of the reactants.",id:"qunknown41_b",is_correct:!1},{label:"(c) Chemical compounds are formed when atoms combine in whole number rations.",id:"qunknown41_c",is_correct:!1},{label:"(d) Every compound always contains the same elements in the same proportions by weight.",id:"qunknown41_d",is_correct:!0},],answer:"d"},{question:"What did J.J Thomson contributed with his experiments in cathode ray tubes in understanding the atomic structure of the atom?",name:"questionunknown42",type:"radio",unit:"unit_0",choices:[{label:"(a) Cathode rays and electric charge were combined together and at separate entities.",id:"qunknown42_a",is_correct:!1},{label:"(b) Cathode rays were actually electrons.",id:"qunknown42_b",is_correct:!0},{label:"(c) Cathode rays and electric chare were separate entities, and not combined together.",id:"qunknown42_c",is_correct:!1},{label:"(d) The electric charge deposited was negative.",id:"qunknown42_d",is_correct:!1},],answer:"b"},{question:"Which of the following properties is true about covalent molecules?",name:"questionunknown43",type:"radio",unit:"unit_0",choices:[{label:"(a) Low melting and boiling points",id:"qunknown43_a",is_correct:!0},{label:"(b) Low melting but high boiling point",id:"qunknown43_b",is_correct:!1},{label:"(c) High melting but low boiling points",id:"qunknown43_c",is_correct:!1},{label:"(d) High electrical and thermal conductivity",id:"qunknown43_d",is_correct:!1},],answer:"a"},{question:"When 20grams of sodium sulfate, Na$_2$SO$_4$, is dissolved in 100 grams of water at 20$^0$C, the solution can be correctly described as",figure:"/334.png",description:"The solubility curves of some common salts in water at 30$^0$C are shown below:",name:"questionunknown44",type:"radio",unit:"unit_0",choices:[{label:"(a) Diluted",id:"qunknown44_a",is_correct:!1},{label:"(b) Supersaturated",id:"qunknown44_b",is_correct:!0},{label:"(c) Saturated",id:"qunknown44_c",is_correct:!1},{label:"(d) Unsaturated",id:"qunknown44_d",is_correct:!1},],answer:"b"},{question:"What is the Arrhenius concept of a base?",name:"questionunknown45",type:"radio",unit:"unit_0",choices:[{label:"(a) A substance that releases hydrogen ion is water is a base.",id:"qunknown45_a",is_correct:!1},{label:"(b) A base is proton acceptor",id:"qunknown45_b",is_correct:!1},{label:"(c) A substance that increase hydroxide ion in water is a base.",id:"qunknown45_c",is_correct:!0},{label:"(d) A base furnishes a pair of electrons.",id:"qunknown45_d",is_correct:!1},],answer:"c"},{question:"The branch of chemistry that is involved in separation, identifying and determined the relative amounts of components in a sample of material is known as",name:"questionunknown46",type:"radio",unit:"unit_0",choices:[{label:"(a) Physical chemistry",id:"qunknown46_a",is_correct:!1},{label:"(b) Inorganic chemistry",id:"qunknown46_b",is_correct:!1},{label:"(c) Biochemistry",id:"qunknown46_c",is_correct:!1},{label:"(d) Analytical chemistry",id:"qunknown46_d",is_correct:!0},],answer:"d"},{question:"Significant figures are figures with",name:"questionunknown47",type:"radio",unit:"unit_0",choices:[{label:"(a) Measured values with the highest accuracy",id:"qunknown47_a",is_correct:!1},{label:"(b) Measured values with the highest uncertainty",id:"qunknown47_b",is_correct:!1},{label:"(c) Measured values with the highest precision",id:"qunknown47_c",is_correct:!1},{label:"(d) Exactly known digits the last digit uncertain",id:"qunknown47_d",is_correct:!0},],answer:"d"},{question:"One of the following is NOT a cause of uncertainty in measurement?",name:"questionunknown48",type:"radio",unit:"unit_0",choices:[{label:"(a) The environment where the measurement is made",id:"qunknown48_a",is_correct:!1},{label:"(b) The measurement device",id:"qunknown48_b",is_correct:!1},{label:"(c) The person doing the experiment",id:"qunknown48_c",is_correct:!1},{label:"(d) The type of material measured",id:"qunknown48_d",is_correct:!0},],answer:"d"},{question:"Which one of the following is needed for photosynthesis?",name:"questionunknown49",type:"radio",unit:"unit_0",choices:[{label:"(a) Carbon dioxide",id:"qunknown49_a",is_correct:!0},{label:"(b) Phosphorus",id:"qunknown49_b",is_correct:!1},{label:"(c) Oxygen",id:"qunknown49_c",is_correct:!1},{label:"(d) Nitrogen",id:"qunknown49_d",is_correct:!1},],answer:"a"},{question:"Commercial concentrated sulfuric acid (density = 1.831 g/$cm^3$) is 94.0% H$_2$SO$_4$, by mass. What is the normality of H$_2$SO$_4$ solution?$\\newline$(Molar mass of H$_2$SO$_4$ = 98  mol$^{-1}$)",name:"questionunknown50",type:"radio",unit:"unit_0",choices:[{label:"(a) 28.2M",id:"qunknown50_a",is_correct:!1},{label:"(b) 35.0M",id:"qunknown50_b",is_correct:!0},{label:"(c) 40.4M",id:"qunknown50_c",is_correct:!1},{label:"(d) 16.7M",id:"qunknown50_d",is_correct:!1},],answer:"b"},{question:"During the electrolysis of a concentrated aqueous solution of NaCl, what substance is formed at the cathode?",name:"questionunknown51",type:"radio",unit:"unit_0",choices:[{label:"(a) Oxygen",id:"qunknown51_a",is_correct:!1},{label:"(b) Sodium",id:"qunknown51_b",is_correct:!1},{label:"(c) Chlorine",id:"qunknown51_c",is_correct:!1},{label:"(d) Hydrogen",id:"qunknown51_d",is_correct:!0},],answer:"d"},{question:"In a voltaic cell, electrons flow from the____ to the_____.",name:"questionunknown52",type:"radio",unit:"unit_0",choices:[{label:"(a) Anode, salt bridge",id:"qunknown52_a",is_correct:!1},{label:"(b) Salt bridge, anode",id:"qunknown52_b",is_correct:!1},{label:"(c) Anode, cathode",id:"qunknown52_c",is_correct:!0},{label:"(d) Salt bridge, cathode",id:"qunknown52_d",is_correct:!1},],answer:"c"},{question:"The relationship between picometer (pm) and nanometer (nm) is",name:"questionunknown53",type:"radio",unit:"unit_0",choices:[{label:"(a) 1 pm = 100 nm",id:"qunknown53_a",is_correct:!1},{label:"(b) 1 nm = 10pm",id:"qunknown53_b",is_correct:!1},{label:"(c) 1 pm = 10 nm",id:"qunknown53_c",is_correct:!1},{label:"(d) 1 nm = 1000 pm",id:"qunknown53_d",is_correct:!0},],answer:"d"},{question:"What would be the wavelength of a radio wave having a frequency of 3 MHz?",name:"questionunknown54",type:"radio",unit:"unit_0",choices:[{label:"(a) 100nm",id:"qunknown54_a",is_correct:!1},{label:"(b) 100m",id:"qunknown54_b",is_correct:!0},{label:"(c) 300nm",id:"qunknown54_c",is_correct:!1},{label:"(d) 300nm",id:"qunknown54_d",is_correct:!1},],answer:"b"},{question:"Which of the following correctly lists electromagnetic waves is order from shortest to longest wavelength?",name:"questionunknown55",type:"radio",unit:"unit_0",choices:[{label:"(a) Gamma rays, ultraviolet, infrared, microwaves",id:"qunknown55_a",is_correct:!0},{label:"(b) Radio waves, infrared, gamma rays, ultraviolet",id:"qunknown55_b",is_correct:!1},{label:"(c) Microwaves, ultraviolet, visible light, gamma rays",id:"qunknown55_c",is_correct:!1},{label:"(d) Gamma rays, infrared, ultraviolet, microwaves",id:"qunknown55_d",is_correct:!1},],answer:"a"},{question:"How many electron are shared between two atoms in a double bond?",name:"questionunknown56",type:"radio",unit:"unit_0",choices:[{label:"(a) 6",id:"qunknown56_a",is_correct:!0},{label:"(b) 4",id:"qunknown56_b",is_correct:!1},{label:"(c) 3",id:"qunknown56_c",is_correct:!1},{label:"(d) 2",id:"qunknown56_d",is_correct:!1},],answer:"a"},{question:"The forces that hold different atoms or ions together are called?",name:"questionunknown57",type:"radio",unit:"unit_0",choices:[{label:"(a) Electric forces",id:"qunknown57_a",is_correct:!1},{label:"(b) Chemical bonds",id:"qunknown57_b",is_correct:!0},{label:"(c) Physical bonds",id:"qunknown57_c",is_correct:!1},{label:"(d) Atomic forces",id:"qunknown57_d",is_correct:!1},],answer:"b"},{question:"Which of the following covalent bonds is the most polar?",name:"questionunknown58",type:"radio",unit:"unit_0",choices:[{label:"(a) H - H",id:"qunknown58_a",is_correct:!1},{label:"(b) H - F",id:"qunknown58_b",is_correct:!0},{label:"(c) H - C",id:"qunknown58_c",is_correct:!1},{label:"(d) H - N",id:"qunknown58_d",is_correct:!1},],answer:"b"},{question:"Which of the following general class of organic molecules do triglycerides belong to?",name:"questionunknown59",type:"radio",unit:"unit_0",choices:[{label:"(a) Ethers",id:"qunknown59_a",is_correct:!1},{label:"(b) Esters",id:"qunknown59_b",is_correct:!0},{label:"(c) Ketones",id:"qunknown59_c",is_correct:!1},{label:"(d) Carbonxylic acid",id:"qunknown59_d",is_correct:!1},],answer:"b"},{question:"Which of the following methods is used to convert is used to convert oils into fats?",name:"questionunknown60",type:"radio",unit:"unit_0",choices:[{label:"(a) Hydrogenation reaction at high temperature and in the presence of a catalyst",id:"qunknown60_a",is_correct:!0},{label:"(b) Hydrolysis reaction in the presence of water and a catalyst",id:"qunknown60_b",is_correct:!1},{label:"(c) Esterification reaction using strong bases like NaOH or KOH",id:"qunknown60_c",is_correct:!1},{label:"(d) Saponification reaction using strong bases like NaOH or KOH",id:"qunknown60_d",is_correct:!1},],answer:"a"},{question:"The chemical makeup of oil is esters of glycerol with three",name:"questionunknown61",type:"radio",unit:"unit_0",choices:[{label:"(a) Identical saturated fatty acids",id:"qunknown61_a",is_correct:!1},{label:"(b) Identical unsaturated fatty acids",id:"qunknown61_b",is_correct:!1},{label:"(c) Predominantly saturated fatty acids",id:"qunknown61_c",is_correct:!1},{label:"(d) Predominantly unsaturated fatty acids",id:"qunknown61_d",is_correct:!0},],answer:"d"},{question:"Which if the following types of solution are possible? $\\newline$Solid dissolved in a liquid$\\newline$Gas dissolved in a liquid$\\newline$Gas dissolved in a gas$\\newline$Solid dissolved in a solid",name:"questionunknown62",type:"radio",unit:"unit_0",choices:[{label:"(a) 1, 2, 3 and 4",id:"qunknown62_a",is_correct:!0},{label:"(b) 1",id:"qunknown62_b",is_correct:!1},{label:"(c) 1, 2 and 4",id:"qunknown62_c",is_correct:!1},{label:"(d) 1 and 2",id:"qunknown62_d",is_correct:!1},],answer:"a"},{question:"Which of the following pairs of substance are miscible?",name:"questionunknown63",type:"radio",unit:"unit_0",choices:[{label:"(a) Water and salt",id:"qunknown63_a",is_correct:!1},{label:"(b) Water and ethanol",id:"qunknown63_b",is_correct:!0},{label:"(c) Water and gasoline",id:"qunknown63_c",is_correct:!1},{label:"(d) Water and oxygen",id:"qunknown63_d",is_correct:!1},],answer:"b"},{question:"Which of the following will increase the rate at which a solid dissolved in a liquid?",name:"questionunknown64",type:"radio",unit:"unit_0",choices:[{label:"(a) Lowering the temperature of the solvent.",id:"qunknown64_a",is_correct:!1},{label:"(b) Grinding the solid into smaller pieces.",id:"qunknown64_b",is_correct:!0},{label:"(c) Placing the solution in opaque container",id:"qunknown64_c",is_correct:!1},{label:"(d) Supersaturated the solution.",id:"qunknown64_d",is_correct:!1},],answer:"b"},{question:"For an acidic solution, which of the following is correct?",name:"questionunknown65",type:"radio",unit:"unit_0",choices:[{label:"(a) pH 7",id:"qunknown65_a",is_correct:!0},{label:"(b) pH > pOH and pKw - pH < 7",id:"qunknown65_b",is_correct:!1},{label:"(c) For acidic solution pH < 7, [H$^+$] < 1 x 0.0000001",id:"qunknown65_c",is_correct:!1},{label:"(d) pH = pOH and pH = $\frac${1/2}pKw =7",id:"qunknown65_d",is_correct:!1},],answer:"a"},{question:"In the production of NH$_3$ by the Haber process according to the equation N$_2$(g) + 3H$_2$(g) ↔ 2NH$_3$(g)ΔH = -92KJmol$^{-1}$ $\\newline$What are the favorable conditions for the production of high yield of NH$_3$?",name:"questionunknown66",type:"radio",unit:"unit_0",choices:[{label:"(a) High pressure and low temperature",id:"qunknown66_a",is_correct:!0},{label:"(b) Low pressure and high temperature",id:"qunknown66_b",is_correct:!1},{label:"(c) Low pressure and low temperature(d) High pressure and high temperature",id:"qunknown66_c",is_correct:!1},],answer:"a"},{question:"Which is the characteristic smell of an ester?",name:"questionunknown67",type:"radio",unit:"unit_0",choices:[{label:"(a) Rotten egg smell",id:"qunknown67_a",is_correct:!1},{label:"(b) Fish like smell",id:"qunknown67_b",is_correct:!1},{label:"(c) Fruity like smell",id:"qunknown67_c",is_correct:!0},{label:"(d) Alcoholic smell",id:"qunknown67_d",is_correct:!1},],answer:"c"},{question:'The theory that states "the collision between two reacting species results in the formation of an activated complex" is known as',name:"questionunknown68",type:"radio",unit:"unit_0",choices:[{label:"(a) Intermediate state theory",id:"qunknown68_a",is_correct:!1},{label:"(b) Collision theory",id:"qunknown68_b",is_correct:!1},{label:"(c) Rate theory",id:"qunknown68_c",is_correct:!1},{label:"(d) Transition state",id:"qunknown68_d",is_correct:!0},],answer:"d"},{question:"Which statement is correct for the reactions: 2A + B $\\to$ C?",name:"questionunknown69",type:"radio",unit:"unit_0",choices:[{label:"(a) The rate of disappearance of B is twice that of A.",id:"qunknown69_a",is_correct:!1},{label:"(b) C appears at a rate equal to the sum of the rates of the disappearance of A and B.",id:"qunknown69_b",is_correct:!1},{label:"(c) The rate of disappearance of A is twice that of B.",id:"qunknown69_c",is_correct:!0},{label:"(d) The rate of appearance of C equals the rate of disappearance of A.",id:"qunknown69_d",is_correct:!1},],answer:"c"},{question:"Which of the following statements is correct about fats and oils?",name:"questionunknown70",type:"radio",unit:"unit_0",choices:[{label:"(a) They are soluble in polar solvents",id:"qunknown70_a",is_correct:!1},{label:"(b) They are readily volatile",id:"qunknown70_b",is_correct:!1},{label:"(c) The burn without leaving ash",id:"qunknown70_c",is_correct:!0},{label:"(d) They are heavier than water",id:"qunknown70_d",is_correct:!1},],answer:"c"},{question:"Which statement is true about catalist?",name:"questionunknown71",type:"radio",unit:"unit_0",choices:[{label:"(a) A negative catalyst increase the rate of a reaction by decreasing the value of activation energy",id:"qunknown71_a",is_correct:!1},{label:"(b) The role of a catalyst is to increase or decrease the rate of a reaction by lowering or increasing the activation energy.",id:"qunknown71_b",is_correct:!0},{label:"(c) A positive catalyst decrease the rate of a reaction by increasing the activation energy.",id:"qunknown71_c",is_correct:!1},{label:"(d) A catalyst slows down or speeds up a reaction, itself being consumed.",id:"qunknown71_d",is_correct:!1},],answer:"b"},{question:"The mathematical expression k = (-Ea/2.3303R)1/T + log A derived from the Arrhenius equation is of important as it shows.",name:"questionunknown72",type:"radio",unit:"unit_0",choices:[{label:"(a) Reactions with larger activation energies have higher values",id:"qunknown72_a",is_correct:!1},{label:"(b) For a given value of activation energy of the rate constant increases as the temperature increases.",id:"qunknown72_b",is_correct:!0},{label:"(c) Reactions with larger activation energies, the value of the rate constant decreases as the temperature increases.",id:"qunknown72_c",is_correct:!1},{label:"(d) For a given value of activation energy, the value of the rate constant decreases as the temperature increases",id:"qunknown72_d",is_correct:!1},],answer:"b"},{question:"What factors affect chemical equilibrium in a chemical reaction?",name:"questionunknown73",type:"radio",unit:"unit_0",choices:[{label:"(a) Change in reactants (s) concentrations (s), volume changes, temperature, presence of catalyst",id:"qunknown73_a",is_correct:!1},{label:"(b) Change in reactant or product concentrations, volume and pressure changes temperature, presence of catalyst",id:"qunknown73_b",is_correct:!1},{label:"(c) Change in reactant or product concentrations, pressure change, temperature, presence of catalyst",id:"qunknown73_c",is_correct:!1},{label:"(d) Change in reactant or product concentrations, volume and pressure changes, temperature",id:"qunknown73_d",is_correct:!0},],answer:"d"},{question:"In the modern periodic table",name:"questionunknown74",type:"radio",unit:"unit_0",choices:[{label:"(a) Elements with similar properties are placed in the same period",id:"qunknown74_a",is_correct:!1},{label:"(b) Metals are placed on the right hand side of the periodic table",id:"qunknown74_b",is_correct:!1},{label:"(c) Non-metals are placed on the right hand side of the periodic table",id:"qunknown74_c",is_correct:!0},{label:"(d) Transition and inner transition elements are placed in the middle of the periodic table",id:"qunknown74_d",is_correct:!1},],answer:"c"},{question:"Which of the following procedures indicates a system which CAN-NOT exchange both energy and matter with the surroundings?",name:"questionunknown75",type:"radio",unit:"unit_0",choices:[{label:"(a) Keeping hot water in a thermostat",id:"qunknown75_a",is_correct:!0},{label:"(b) Baking injera",id:"qunknown75_b",is_correct:!1},{label:"(c) Water boiling in an open beaker",id:"qunknown75_c",is_correct:!1},{label:"(d) Cooking shiro-wet in a closed pan",id:"qunknown75_d",is_correct:!1},],answer:"a"},{question:"Natural polymers are",name:"questionunknown76",type:"radio",unit:"unit_0",choices:[{label:"(a) Polymers produced by the substitution of one or more atoms in the monomer units.",id:"qunknown76_a",is_correct:!1},{label:"(b) Polymers produced by condensation reaction of monomer units.",id:"qunknown76_b",is_correct:!1},{label:"(c) Polymers produced by the addition reaction of monomer units.",id:"qunknown76_c",is_correct:!1},{label:"(d) Polymers found in some substances like rubber in nature.",id:"qunknown76_d",is_correct:!0},],answer:"d"},{question:"One of the following examples of polymers is correctly matched with is uses.",name:"questionunknown77",type:"radio",unit:"unit_0",choices:[{label:"(a) Polytetrafluoroethylenes; making shoes",id:"qunknown77_a",is_correct:!1},{label:"(b) Polyvinyl chloride; making pipes",id:"qunknown77_b",is_correct:!0},{label:"(c) Polypropylene; electric insulation",id:"qunknown77_c",is_correct:!1},{label:"(d) Polyethylene; food containers",id:"qunknown77_d",is_correct:!1},],answer:"b"},{question:"Which of the following statements is NOT true in relation to the triple point on a single component phase diagram?",name:"questionunknown78",type:"radio",unit:"unit_0",choices:[{label:"(a) The triple point exists at a single temperature and is independent of pressure.",id:"qunknown78_a",is_correct:!0},{label:"(b) The system must be enclosed so that no vapour can escape.",id:"qunknown78_b",is_correct:!1},{label:"(c) The triple point exists for a substance occurs at a specific temperature and pressure.",id:"qunknown78_c",is_correct:!1},{label:"(d) The point at which the solid, liquid and gaseous phases for a substance co-exist.",id:"qunknown78_d",is_correct:!1},],answer:"a"},{question:"Which one the following types of bonding exists between atoms with every different electro negatives?",name:"questionunknown79",type:"radio",unit:"unit_0",choices:[{label:"(a) Ionic bonding",id:"qunknown79_a",is_correct:!0},{label:"(b) Network covalent bonding",id:"qunknown79_b",is_correct:!1},{label:"(c) Metal bonding",id:"qunknown79_c",is_correct:!1},{label:"(d) Ionic bonding",id:"qunknown79_d",is_correct:!1},],answer:"a"},],s=function(){var e=(0,t.useState)(!1),n=e[0],i=e[1];return(0,o.jsx)(r.Z,{title:"Chemistry Enterance Exam",children:(0,o.jsx)("div",{className:"relative mx-auto mb-10 flex flex-col px-8 md:px-0 lg:mx-0",children:(0,o.jsx)("div",{className:"mt-8 flex lg:px-10",children:(0,o.jsx)("div",{className:" lg:lg:max-w-7xl",children:(0,o.jsx)(a.Z,{questions:c,open:n,title:"Chemistry Exam",setOpen:i})})})})})}}},function(e){e.O(0,[573,664,675,361,774,888,179],function(){return e(e.s=6355)}),_N_E=e.O()}]);