Dry Cell and Lead Accumulator NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Dry Cell and Lead Accumulator MCQ Questions


13.
An alkaline dry cell differs from a Leclanché dry cell mainly in that:
A.
It uses KOH instead of NH₄Cl as the electrolyte
B.
It uses Cu instead of Zn as the anode
C.
It generates a much higher voltage (~6 V)
D.
It uses Fe₂O₃ instead of MnO₂ as the cathodic material
😑 View Answer Rough Work Error
ANSWER :
A. It uses KOH instead of NH₄Cl as the electrolyte
14.
In an alkaline dry cell, the anode reaction is:
A.
Zn(s) + 2NH₄⁺ → Zn(NH₃)₄²⁺ + 2e⁻
B.
Zn(s) → Zn²⁺ + 2e⁻
C.
Zn(s) + 2OH⁻ → Zn(OH)₂ + 2e⁻
D.
Zn(s) + 2H⁺ → Zn²⁺ + H₂
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ANSWER :
C. Zn(s) + 2OH⁻ → Zn(OH)₂ + 2e⁻
15.
Which of the following is NOT a primary cell?
A.
Alkaline dry cell
B.
Lead storage battery
C.
Leclanché dry cell
D.
Mercury cell
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ANSWER :
B. Lead storage battery
16.
The mercury cell, often used in hearing aids and watches, has the cathode reaction:
A.
MnO₂ + H₂O + 2e⁻ → Mn₂O₃ + 2OH⁻
B.
HgO(s) + H₂O + 2e⁻ → Hg(l) + 2OH⁻
C.
Pb²⁺ + 2e⁻ → Pb
D.
Hg²⁺ + 2e⁻ → Hg(l)
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ANSWER :
B. HgO(s) + H₂O + 2e⁻ → Hg(l) + 2OH⁻
17.
The constant EMF (~1.35 V) maintained by a mercury cell throughout its life is because:
A.
The reactants and products are pure solids/liquids whose activities remain constant
B.
It has a very high concentration of electrolyte
C.
It contains a built-in voltage regulator
D.
The cell self-recharges from atmospheric oxygen
😑 View Answer Rough Work Error
ANSWER :
A. The reactants and products are pure solids/liquids whose activities remain constant
18.
The lead-acid storage battery (lead accumulator) is an example of:
A.
A secondary (rechargeable) cell
B.
A concentration cell
C.
A primary (non-rechargeable) cell
D.
A fuel cell
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ANSWER :
A. A secondary (rechargeable) cell