Electrochemistry Class 12 MCQ Questions free PDF Download

Electrochemistry Class 12 MCQ Questions We have provided you with Electrochemistry class 12 MCQ Question with Answers free PDF download as per latest CBSE syllabus. To score good marks in your exam practice these MCQ Questions on a daily basis.You can also get an unseen passage for class 4 to 12 in hindi and english here.

Question. Which of the following statements about galvanic cell is incorrect

(a) anode is positive

(b) oxidation occurs at the electrode with lower reduction potential

(c) cathode is positive

(d) reduction occurs at cathode

Answer

Question. Which device converts chemical energy of a spontaneous redox reaction into electrical energy?

(a) Galvanic cell

(b) Electrolytic cell

(c) Daniell cell

(d) Both (a) and (c)

Answer

Question. The tendency of an electrode to lose electrons is known as

(a) electrode potential

(b) reduction potential

(c) oxidation potential

(d) e.m.f.

Answer

Question. The reference electrode is made by using

(a) ZnCl2

(b) CuSO4

(c) HgCl2

(d) Hg2Cl2

Answer

Question. Which of the following statements is incorrect regarding electrochemistry?

(a) It is the study of production of electricity from energy released during spontaneous chemical reactions.

(b) NaOH, Cl2, alkali and alkaline earth metals are prepared by electrochemical methods.

(c) The demerit associated with electrochemical methods is that they are more polluting. Thus they are ecodestructive.

(d) Electrochemical reactions are more energy efficient and less polluting.

Answer

Question. What flows in the internal circuit of a galvanic cell?

(a) Ions

(b) Electrons

(c) Electricity

(d) Atoms

Answer

Question. In which of the following conditions salt bridge is not required in a galvanic cell?

(a) When galvanic cell is used in geyser.

(b) When distance between oxidation half cell and reduction half cell is negligible.

(c) Electrolytic solutions used in both the half cells are of same concentration.

(d) When both the electrodes are dipped in the same electrolytic solution.

Answer

Question. The standard hydrogen electrode potential is zero, because

(a) hydrogen oxidized easily

(b) electrode potential is considered as zero

(c) hydrogen atom has only one electron

(d) hydrogen is a very light element

Answer

Question. The oxidation potentials of A and B are +2.37 and +1.66 V respectively. In chemical reactions

(a) A will be replaced by B

(b) A will replace B

(c) A will not replace B

(d) A and B will not replace each other

Answer

Question. Without losing its concentration ZnCl2 solution cannot be kept in contact with

(a) Au

(b) Al

(c) Pb

(d) Ag

Answer

Question. Which of the following statement is not correct about an inert electrode in a cell ?

(a) It does not participate in the cell reaction.

(b) It provides surface either for oxidation or for reduction reaction.

(c) It provides surface for conduction of electrons.

(d) It provides surface for redox reaction.

Answer

Question. The standard emf of a cell, involving one electron change is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is (F = 96500 C mol–1)

(a) 1.0 × 101

(b) 1.0 × 105

(c) 1.0 × 1010

(d) 1.0 ×1030

Answer

Question. A smuggler could not carry gold by depositing iron on the gold surface since

(a) gold is denser

(b) iron rusts

(c) gold has higher reduction potential than iron

(d) gold has lower reduction potential than iron

Answer

Question. If 0.01 M solution of an electrolyte has a resistance of 40 ohms in a cell having a cell constant of 0.4 cm–1, then its molar conductance in ohm–1 cm2 mol–1 is

(a) 102

(b) 104

(c) 10

(d) 103

Answer

Question. Specific conductance of 0.1 M HNO3 is 6.3×10–2 ohm–1 cm–1. The molar conductance of the solution is

(a) 100 ohm–1 cm2

(b) 515 ohm–1 cm2

(c) 630 ohm–1 cm2

(d) 6300 ohm–1 cm2

Answer

Question. The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm–1cm–1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm.The cell constant will be

(a) 0.142 cm–1

(b) 0.66 cm–1

(c) 0.918 cm–1

(d) 1.12 cm–1

Answer

Question. The unit of specific conductivity is

(a) ohm cm–1

(b) ohm cm–2

(c) ohm–1 cm

(d) ohm–1 cm–1

Answer

Question. Which of the following solutions of KCl will have the highest value of specific conductance?

(a) 1.0 N

(b) 0.1 N

(c) 1.0 ×10–2N

(d) 1.0 ×10–3N

Answer

Question. Specific conductance of a 0.1 N KCl solution at 23ºC is 0.012 ohm–1 cm–1. Resistance of cell containing the solution at same temperature was found to be 55 ohm. The cell constant is

(a) 0.0616 cm–1

(b) 0.66 cm–1

(c) 6.60 cm–1

(d) 660 cm–1

Answer

Question. The unit of equivalent conductivity is

(a) ohm cm

(b) ohm–1 cm2 (g equivalent)–1

(c) ohm cm2 (g equivalent)

(d) S cm–2

Answer

Question. Which of the following is the use of electrolysis?

(a) Electrorefining

(b) Electroplating

(c) Both (a) & (b)

(d) None of these

Answer

Question. An electrolytic cell contains a solution of Ag2SO4 and has platinum electrodes. A current is passed until 1.6 gm of O2 has been liberated at anode. The amount of silver deposited at cathode would be

(a) 107.88 gm

(b) 1.6 gm

(c) 0.8 gm

(d) 21.60 gm

Answer

Question. When 9650 coulombs of electricity is passed through a solution of copper sulphate, the amount of copper deposited is (given at. wt. of Cu = 63.6)

(a) 0318g

(b) 3.18 g

(c) 31.8g

(d) 63.6g

Answer

Question. The cell constant of a conductivity cell ___________.

(a) changes with change of electrolyte.

(b) changes with change of concentration of electrolyte.

(c) changes with temperature of electrolyte.

(d) remains constant for a cell.

Answer

Question. On which of the following magnitude of conductivity does not depends?

(a) Nature of material

(b) Temperature

(c) Pressure

(d) Mass of the material

Answer

Question. A silver cup is plated with silver by passing 965 coulombs of electricity. The amount of Ag deposited is :

(a) 107.89 g

(b) 9.89 g

(c) 1.0002 g

(d) 1.08 g

Answer

Question. The number of coulombs required to reduce 12.3 g of nitrobenzene to aniline is :

(a) 115800 C

(b) 5790 C

(c) 28950 C

(d) 57900 C

Answer

Question. The amount of electricity that can deposit 108 g of Ag from AgNO3 solution is:

(a) 1 F

(b) 2 A

(c) 1 C

(d) 1 A

Answer

Question. Electrolysis of fused NaCl will give

(a) Na

(b) NaOH

(c) NaClO

(d) None of these

Answer

Question. Which of the following statements is incorrect?

(a) Both electronic and electrolytic conductance depends on the nature of conducting material.

(b) Both electronic and electrolytic conductance varies similarly with temperature.

(c) Electronic conductance is independent but electrolytic conductance depends on the amount of the conducting substance.

(d) All the above statements are incorrect.

Answer

Question. Which of the following metals is not produced by electrochemical reduction?

(a) Na

(b) Fe

(c) Mg

(d) Al

Answer

Question. In electrolysis of dilute H2SO4 using platinum electrodes

(a) H2 is evolved at cathode

(b) NH2 is produced at anode

(c) Cl2 is obtained at cathode

(d) O2 is produced

Answer

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