Electrochemistry Class 12 MCQ

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Electrochemistry Class 12 MCQ. We covered all the Electrochemistry Class 12 MCQ in this post for free so that you can practice well for the exam.

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MCQ on Electrochemistry for NEET Students

The standard reduction potential values of three metallic cations X, Y, and Z are -0.52, -3.03, and -1.18 V respectively. The order of reducing the power of the corresponding metals is :

(A) Y>Z>X

(B) X>Y>Z

(C) Z>Y>X

(D) Z>X>Y

Option a – Y>Z>X

5 F of electricity is passed through a solution of CuSO4. The mass of copper deposited at the cathode is ………. (Atomic mass of Cu = 63.5)

(A) 63.5 g

(B) 95.25 g

(C) 158.75 g

(D) 317.5 g

Option c – 158.75 g

Which of the following is the INCORRECT statement?

(A) Reduction is a process, which involves the gain of electrons.

(B) Redox reactions involve the transfer of electrons from one species to another species.

(C) Faraday is the amount of electric charge on one mole of electrons.

(D) The passage of electricity through electronic conductors involves the transfer of matter.

Option d – The passage of electricity through electronic conductors involves the transfer of matter.

Which of the following is strongly electropositive?

(A) Ag (E° = +0.80 V)

(B) Al (E° -1.66 V)

(C) Mg (E° = -2.37 V)

(D) Ca (E° = -2.87 V)

Option d – Ca (E° = -2.87 V)

Select the appropriate option regarding statements 1 and 2. Statement 1: The molar conductivity of a solution increases with a decrease in the concentration of an electrolyte. Statement 2: The conductivity of a solution decreases with a decrease in the concentration of an electrolyte.

(A) Only statement 1 is correct.

(B) Only statement 2 is correct.

(C) Both statements are incorrect.

(D) Both statements are correct.

Option d – Both statements are correct.

The products obtained at the cathode and anode respectively during the electrolysis of aqueous AgNO3 solution using platinum electrodes are ……….

(A) Ag(s), O2(g)

(B) Ag(s), NO2(g)

(C) H2(g), Ag(s)

(D) Ag(s), H2(g)

Option a – Ag(s), O2(g)

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 5 amperes is ……….

(A) 0.50 hours

(B) 0.85 hours

(C) 1.07 hours

(D) 6.43 hours

Option c – 1.07 hours

Identify the CORRECT statement with respect to the standard reduction potential (E°) of a half-reaction.

(A) The negative E value indicates the tendency of the half-reaction to occur in the reverse direction.

(B) The magnitude of E° changes when the half-reaction is reversed.

(C) The sign of E° remains the same when the half-reaction is reversed.

(D) The numerical value of E° doubles if the half-reaction is multiplied by 2.

Option a – The negative E value indicates the tendency of the half-reaction to occur in the reverse direction.

When water is electrolyzed, hydrogen and oxygen gases are produced. If 1.008 g of H₂ is liberated at the cathode, what mass of O₂ is formed at the anode?

(A) 32 g

(B) 16 g

(C) 8 g

(D) 4 g

Option c – 8 g

Which of the following is INCORRECT regarding the cathodic protection of an underground iron pipe using magnesium?

(A) The iron pipe acts as the cathode and magnesium acts as the anode.

(B) To prevent the rusting of iron pipe, its entire surface should be covered with magnesium.

(C) The moist soil serves as an electrolyte.

(D) The iron pipe is protected from rusting because magnesium oxidizes more easily than iron.

Option b – To prevent the rusting of iron pipe, its entire surface should be covered with magnesium.

Which of the following is the INCORRECT statement?

(A) In the dry cell, the zinc container acts as the anode, and the graphite rod acts as the cathode.

(B) The lead storage cell acts as a galvanic cell during recharging.

(C) In the alkaline dry cells, a basic electrolyte (NaOH or KOH) is used.

(D) NICAD cell has a longer life than lead storage cell.

Option b – The lead storage cell acts as a galvanic cell during recharging

The quantity of electricity needed to separately electrolyze 100 mL of 1 M solutions of Niso4, CrCl3, and ZnSO4 completely is in the ratio of ……..

(A) 2 : 3 : 2

(B) 2 : 3 : 1

(C) 2 : 1 : 2

(D) 1 : 3 : 1

Option a – 2 : 3 : 2

Assertion: Aqueous copper sulphate solution cannot be stored in a vessel made of zinc. Reason: Zinc is more reactive than copper.

(A) Assertion and Reason are true. The reason is the correct explanation of the Assertion.

(B) Assertion and Reason are true. The reason is not the correct explanation of the Assertion.

(C) The assertion is true, and the Reason is false.

(D) The assertion is false, Reason is true.

Option a – Assertion and Reason are true. The reason is the correct explanation of the Assertion.

The value of the potential of a hydrogen electrode having pH = 10 and partial pressure of H₂ = 1 bar is ………

(A) 0.4 V

(B) -0.4 V

(C) -0.59 V

(D) 0.59 V

Option c – -0.59 V

1 mole of Al is deposited by a ‘Y’ coulomb of electricity passing through an aluminum nitrate solution. The number of mole of silver deposited by ‘Y’ coloumb of electricity from silver nitrate solution is ……..

(A) 1

(B) 2

(C) 3

(D) 4

Option c – 3

We covered all the electrochemistry class 12 MCQ above in this post for free so that you can practice well for the exam.

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