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

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