Chemistry MCQ (Multiple Choice Questions) - SchoolingAxis

Chemistry MCQ (Multiple Choice Questions)

 Que-  If electricity is passed through CuSO4 solution by using Pt electrode then which of the following possible change occurs? 

a. H2 is deposited at cathode 

b. Colour of the solution becomes fade 

c. Cu is deposited at anode 

d. All are possible 


Answer- Colour of the solution becomes fade


Que-  Stronger the oxidizing agent greater is the 

a. Oxidation potential 

b. Reduction potential 

c. Redox potential 

d. emf of cell 


Answer- Reduction potential


Que-  Which has maximum oxidation number? 

a. N 

b. Cr 

c. S 

d. Mn 


Answer- Mn


Que-  Which of the following cell is not rechargeable? 

a. Lead storage battery 

b. Silver oxide cell 

c. Fuel cell 

d. Ni-Cd cell 


Answer- Silver oxide cell


Que-  In an electrolytic cell current flows ? 

a. From cathode to anode in outer circuit 

b. From anode to cathode outside the cell 

c. From cathode to anode inside the cell 

d. both b & c 


Answer- From anode to cathode outside the cell


Que-  Which of the following is true in the case of Zn-Cu cell? 

a. The flow of electrons takes place from copper to zinc 

b. E0red of copper electrode is less than that of zinc electrode 

c. Zinc acts as an anode and copper as cathode 

d. All are correct 


Answer- Zinc acts as an anode and copper as cathode


Que-  In a galvanic cell 

a. Chemical energy is converted into electricity 

b. Chemical energy is converted into heat 

c. Electrical energy is converted into chemical energy 

d. Electrical energy is converted into heat 


Answer- Chemical energy is converted into electricity


Que-  The degree of dissociation of week electrolyte increases as 

a. Pressure increases 

b. Dilution decreases 

c. Dilution increases 

d. None 


Answer- Dilution increases


Que-  Molten NaCl conducts electricity due to the presence of 

a. Free electrons 

b. Free molecules 

c. Free ions 

d. Atoms of Na and Cl 


Answer- Free ions


Que-  Electricity in voltaic cell is produced due to 

a. neutralization 

b. oxidation 

c. reduction 

d. both b & c 


Answer- both b & c


Que-  In electrolytic solution conductance of electricity is due to 

a. free electrons 

b. ions 

c. metals 

d. electrodes 


Answer- ions


Que-  In electrolytic cell electricity carries 

a. spontaneous reaction 

b. non-wpontaneous reaction 

c. neutralization 

d. all of above 


Answer- non-wpontaneous reaction


Que-  Reaction at anode is called 

a. oxidation 

b. reduction 

c. redox 

d. decomposition 


Answer- oxidation


Que-  In Galvanic cell electrons flow from anode to cathode through 

a. external electric circuit 

b. salt bridge 

c. movement of ions 

d. all of the above 


Answer- external electric circuit


Que-  Decrease in oxidation number is called 

a. oxidation 

b. reduction 

c. oxidation-reduction 

d. all of above represent same entity 


Answer- reduction


Que-  For the measurement of standard electrode potential Zn is dipped in 

a. 1 M ZnO solution 

b. 1 M ZnSO4 solution 

c. 5 M ZnSO4 solution 

d. 1 M ZnSO4 solution 


Answer- 1 M ZnSO4 solution


Que-  Right half cell contains __________ electrode 

a. A1 

b. Zn 

c. Cu 

d. Fe 


Answer- Cu


Que-  Salt bridge transfers 

a. electrons 

b. anion 

c. current 

d. ions 


Answer- ions


Que-  Voltaic cell can be recharged by 

a. by addition of fresh solution 

b. by replacing external circuit with external source of electricity 

c. by removal of solution 

d. by heating it 


Answer- by replacing external circuit with external source of electricity


Que-  E0red of an element cab be calculated by comparing it with 

a. New electrode of same element 

b. SHE 

c. 1M solution of ions of respective element 

d. 2M solution of HCI 


Answer- SHE


Que-  Temperature for the measurement of standard electrode potential is 

a. 298K 

b. 300K 

c. 30Degree Centigrade 

d. 310K 


Answer- 298K


Que-  H2 gas in SHE is filled at pressure of 

a. 760mm of Hg 

b. 750mm of Hg 

c. 780mm of Hg 

d. 800mm of Hg 


Answer- 760mm of Hg


Que-  Potential of SHE is considered as 

a. zero 

b. unity 

c. constant 

d. multiple of 1 


Answer- zero


Que-  Chemical used in salt bridge is 

a. KOH 

b. KCI 

c. KNO3 

d. KBr 


Answer- KCI


Que-  Electrode potential of Zn is 

a. oxidation 

b. reduction 

c. oxidation-reduction 

d. depends on the nature of the coupled electrode 


Answer- depends on the nature of the coupled electrode


Que-  List of elements based on hydrogen scale is called 

a. periodic table 

b. groups 

c. periods 

d. electrochemical series 


Answer- electrochemical series


Que-  The element that act as anode always have _______ position in electrochemical cell 

a. higher 

b. lower 

c. in middle 

d. no effect of position 


Answer- higher


Que-  In galvanic cell Zn acts as an anode so its value of standard reduction potential in comparison to coupled electrode would be 

a. greater 

b. lesser 

c. sum of reduction and oxidation potentials 

d. none 


Answer- greater


Que-  Greater value of standard reduction potential greater will be tendency 

a. to get oxidized 

b. to get reduced 

c. to accept electrons 

d. both b and c 


Answer- both b and c


Que-  Greater value of standard reduction potential smaller will be tendency 

a. to form positive ions 

b. to form negative ions 

c. gain electrons 

d. all are possible 


Answer- to form positive ions


Que-  Secondary cell is 

a. rechargeable 

b. non rechargeable 

c. electrolytic cell 

d. Daniel cell 


Answer- rechargeable


Que-  Lead accumulators are 

a. secondary cell 

b. primary cell 

c. voltaic cell 

d. both a & c 


Answer- both a & c


Que-  Density of H2SO4 in lead accumulator is 

a. 25g/cm3 

b. 3g/cm3 

c. 20g/cm3 

d. 15g/cm3 


Answer- 25g/cm3


Que-  Capacity of one lead accumulator cell is 

a. 5 volts 

b. 2 volts 

c. 3 volts 

d. 1 volts 


Answer- 2 volts


Que-  In alkaline battery the anode is made up of 

a. MnO2 

b. Zn 

c. AgO2 

d. cadmium 


Answer- Zn


Que-  The strength of solution of an element whose electrode potential is to be measured is 

a. 2M 

b. 1N 

c. 1m 

d. 1M 


Answer- 1M


Que-  Apparent charge on atom in molecule is 

a. valency 

b. coordination number 

c. oxidation number 

d. charge number 


Answer- oxidation number


Que-  Voltaic cell is a 

a. irreversible cell 

b. reversible cell 

c. alkaline cell 

d. all of the above 


Answer- all of the above


Que-  In K2Cr2O7 the oxidation number of chromium is 

a. 7 

b. 6 

c. -7 

d. -6 


Answer- 6


Que-  Percentage of sulphuric acid in lead accumulator is 

a. 40% 

b. 25% 

c. 30% 

d. 50% 


Answer- 30%


Que-  The reduction potential Zn is 

a. 76 

b. -0.76 

c. -0.55 

d. 55 


Answer- -0.76


Que-  The half cells are interconnected through 

a. wire 

b. salt bridge 

c. electric circuit 

d. no connection exists 


Answer- salt bridge


Que-  The rate of reaction 

a. Increases as the reaction proceeds 

b. Decreases as the reaction proceeds 

c. Remains the same as the reaction proceeds 

d. May decrease or increase as the reaction proceeds 


Answer- Decreases as the reaction proceeds


Que-  The addition of a catalyst to the reaction system 

a. Increases the rate of forward reaction only 

b. Increases the rate of reverse reaction 

c. Increases the rate of forward but decreases the rate of backward reaction 

d. Increases the rate of forward as well as backward reaction equally 


Answer- Increases the rate of forward as well as backward reaction equally


Que-  The specific rate constant of a first order reaction depends on the 

a. Time 

b. Concentration of the reactant 

c. Temperature 

d. Concentration of the product 


Answer- Temperature


Que-  On increasing the temperature the rate of reaction increases mainly because 

a. The activation energy of the reaction increases 

b. Concentration of the reacting molecules increases 

c. Collision frequency increases 

d. None of these 


Answer- Collision frequency increases


Que-  The value of activation energy is primarily determined by 

a. Temperature 

b. Effective collision 

c. Concentration of reactants 

d. Chemical nature of reactants and products 


Answer- Effective collision


Que-  Sum of exponents of molar concentration is called 

a. Order of reaction 

b. Molecularity 

c. Rate of reaction 

d. Average of reaction 


Answer- Order of reaction


Que-  Spontaneous reactions are 

a. Moderate 

b. Slow 

c. Fast 

d. not natural 


Answer- Fast


Que-  In rate expression the concentration of reactants is negative. It shows 

a. Concentration of reactant does not change 

b. Concentration of product increases 

c. Concentration of reactant decreases 

d. Concentration of reactant increases 


Answer- Concentration of reactant decreases


Que-  Unit of rate of reaction is 

a. Moles dm-3 sec-1 

b. Moles dm-3 

c. Moles sec-1 

d. Mol-1 dm3 sec-1 


Answer- Moles dm-3 sec-1


Que-  When a graph is plotted between 1/T on X-axis and log k on y-axis a straight line is obtained with a negative slope which has two end in 

a. I and II quadrant 

b. II and III quadrant 

c. III and IV quadrant 

d. II and IV quadrant 


Answer- II and IV quadrant


Que-  Rate of disappearance of reactant is equal to 

a. Rate of reaction 

b. Rate of formation of product 

c. Energy released during reaction 

d. a and b 


Answer- Rate of reaction


Que-  Rate of reaction when concentration of reactants are taken as unity is called 

a. Arrhenius constant 

b. Molecularity 

c. Specific rate constant 

d. Ideal rate constant 


Answer- Specific rate constant


Que-  For 3rd order reaction the hhalf life is inversely proportional to initial concentration of reactants 

a. Single 

b. Square 

c. Cube 

d. Raise to power four 


Answer- Square


Que-  Which order of reaction obeys the relation t1/2 = 1/Ka 

a. First order 

b. Second order 

c. Third order 

d. Zero order 


Answer- Second order


Que-  Radiations are absorbed in 

a. Spectrophotometer method 

b. Dilatometric method 

c. Optical relation method 

d. Refractometric method 


Answer- Spectrophotometer method


Que-  Activated complex is formed due to 

a. Pressure 

b. Effective collision 

c. Ineffective collisions 

d. Temperature 


Answer- Effective collision


Que-  Energy of reactant higher than energy of product favours 

a. Endothermic 

b. Exothermic 

c. Moderate reaction 

d. No reaction 


Answer- Exothermic


Que-  Energy required to form transition state is called 

a. Ea 

b. P.E 

c. V 

d. K.E 


Answer- Ea


Que-  Which of the following will have very high rate of reaction? 

a. Double decomposition reaction 

b. Neutralization reaction 

c. Ionic reactions 

d. all of above 


Answer- all of above


Que-  Greater the conc. Of reactant 

a. Greater will be dx/dt 

b. Lesser will be dx/dt 

c. dx/dt will be moderate 

d. any of above 


Answer- Greater will be dx/dt


Que-  Anything which increases rate of reaction without being involved in the reaction 

a. Promoter 

b. Catalyst 

c. Inhibitor 

d. All of the above 


Answer- Catalyst


Que-  The substances that reduces the effectiveness of a catalyst are called 

a. Promoters 

b. Poisoning catalysts 

c. Inhibitors 

d. pro-catalysts 


Answer- Poisoning catalysts


Que-  When catalysts and reactants are in more than one phase it is 

a. Homogeneous catalysis 

b. Heterogeneous catalysis 

c. Catalysis 

d. Ea 


Answer- Heterogeneous catalysis


Que-  Each catalyst has 

a. Specificity 

b. Special structure 

c. Its own Ea 

d. all of above 


Answer- all of above


Que-  Biocatalytical proteins are 

a. Enzymes 

b. Substrate 

c. Lipids 

d. any of above 


Answer- Enzymes


Que-  A catalyst can not effect 

a. Products 

b. Chemical equilibrium 

c. Reactants 

d. both a & b 


Answer- both a & b


Que-  An enzyme has its specificity due to 

a. Substrate 

b. Structure 

c. Temperature 

d. Pressure 


Answer- Structure


Que-  Co-enzymes are 

a. Non proteineous 

b. Proteineous 

c. sugars 

d. lipids 


Answer- Non proteineous


Que-  A substance which increases the reactivity of enzyme is called 

a. Promoters 

b. Inhibitors 

c. Stimulators 

d. Non-activators 


Answer- Promoters


Que-  End name of enzyme is 

a. yl 

b. ase 

c. one 

d. al 


Answer- ase


Que-  When the reaction completes in more than one steps rate of reaction will be determined by 

a. Fast step 

b. Slowest step 

c. All steps 

d. Molecularity of the reaction 


Answer- Slowest step


Que-  For determining the order of reaction we use 

a. Refractometric method 

b. Dilatometric method 

c. Optical activity method 

d. Half life method 


Answer- Half life method


Que-  Energy of activation for backward reaction is less than forward reaction for ________ reaction 

a. Endothermic 

b. Exothermic 

c. Moderate 

d. Fast 


Answer- Endothermic


Que-  Which statement is incorrect about catalyst 

a. it is used in smaller amount 

b. decrease activation energy 

c. specific in action 

d. it affects specific rate constant 


Answer- it affects specific rate constant


Que-  Elements in the same vertical group of the periodic table have same 

a. Number of valence electrons 

b. Atomic number 

c. Atomic mass 

d. Atomic volume 


Answer- Number of valence electrons


Que-  An element having low value of ionization energy and low value of electron affinity is likely to belong to 

a. Group IA 

b. Group IB 

c. Group VIIA 

d. Group VIII 


Answer- Group IA


Que-  Which set of elements is listed in order of increasing ionization energy? 

a. Sb < As < S < P < Cl 

b. Cl < Sb < P < As < S 

c. As < Cl < P < S < Sb 

d. Sb < As < Cl < S < P 


Answer- Sb < As < S < P < Cl


Que-  Which of the following always increases on going from top to bottom in a group? 

a. Metallic character 

b. Electronegativity 

c. Oxidizing power 

d. Tendency to get reduced 


Answer- Metallic character


Que-  Which of the p-block elements are not representative elements? 

a. Alkali metals (I-A) 

b. Group-14 elements (IV-A) 

c. Group-18 elements (VIII-A) 

d. Halogens (VII-A) 


Answer- Group-18 elements (VIII-A)


Que-  Among halogens the highest boiling point is of 

a. Flrorine 

b. Chlorine 

c. Bromine 

d. Iodine 


Answer- Iodine


Que-  Which of the following will not form crystalline structure with opporitely charged ions 

a. H+ 

b. H- 

c. Mg2+ 

d. Ca2+ 


Answer- H+


Que-  Which statement is incorrect? 

a. All the metals are good conductor of electricity. 

b. All the metals are good conductor of heat 

c. All the metals form positive ions 

d. All the metals form acidic oxides 


Answer- All the metals form acidic oxides


Que-  Periodic table provides a basic framework to study elements with respect to their 

a. Physical properties 

b. Chemical properties 

c. Properties of their compounds 

d. All 


Answer- All


Que-  The scientist who did not contribute in the construction of periodic table? 

a. Al-Razi 

b. Moseley 

c. Dobereiner 

d. Democritus 


Answer- Democritus


Que-  Concept of Triads was introduced by 

a. Dobereiner 

b. Newland 

c. Mendeleev 

d. Al-Razi 


Answer- Dobereiner


Que-  Which element was not known when Mendeleev proposed his classification? 

a. Hydrogen 

b. Sodium 

c. Copper 

d. Germanium 


Answer- Germanium


Que-  Elements with similar chemical properties appear in the 

a. Same family 

b. Same period 

c. p block elements 

d. Right upper corner 


Answer- Same family


Que-  Noble gases are named so because they are 

a. less reactive 

b. Zero group elements 

c. Having completely filled valence shell 

d. All 


Answer- All


Que-  In modern periodic table all the leements are arranged in ascending order of 

a. Valency 

b. Atomic mass 

c. Atomic number 

d. Valence electrons 


Answer- Atomic number


Que-  The longest period in the modern periodic table is 

a. 6th 

b. 7th 

c. 2nd and 3rd both 

d. 5th 


Answer- 6th


Que-  Inner transition elements are called 

a. Lanthanides 

b. Actinides 

c. Rare earth metals 

d. All 


Answer- All


Que-  Seventh period contains ______________ normal elements 

a. 2 

b. 4 

c. 6 

d. 8 


Answer- 2


Que-  Modern periodic table has been divided in _______ blocks 

a. 2 

b. 4 

c. 8 

d. 7 


Answer- 4


Que-  Non-metals usually form ______________ oxides 

a. Acidic 

b. Amphoteric 

c. Neutral 

d. All of the above 


Answer- Acidic


Que-  Amphoteric exides are those which possess ________ properties 

a. Acidic 

b. Basic 

c. Acidic and basic 

d. Neutral and acidic 


Answer- Acidic and basic


Que-  Best position of hydrogen in the periodic table is above I.A Group which is mainly due to 

a. Both are electropositive 

b. Similar outer most shell electronic configuration 

c. Both form ionic compounds 

d. All 


Answer- All


Que-  Hydrogen resembles with carbon because of having 

a. Same number of electrons in the valence shell 

b. Similar physical state 

c. Remarkable reducing properties 

d. Homovalent (show same valency) 


Answer- Remarkable reducing properties


Que-  Which one of the following sets consists of all coinage metals? 

a. Cu Hg Au 

b. Cu Ag Au 

c. Ag Au Hg 

d. Cu Fe Au 


Answer- Cu Ag Au

Previous Post Next Post