Dry Cell and Lead Accumulator NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Dry Cell and Lead Accumulator MCQ Questions


1.
The dry cell, commonly used in flashlights and transistors, is also known as:
A.
Edison cell
B.
Weston cell
C.
Daniell cell
D.
Leclanché cell
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ANSWER :
D. Leclanché cell
2.
In a dry cell, the anode (negative electrode) is made of:
A.
Graphite rod
B.
Manganese dioxide (MnO₂)
C.
Zinc container (Zn)
D.
Copper wire
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ANSWER :
C. Zinc container (Zn)
3.
The cathode in a dry cell consists of:
A.
A copper rod immersed in copper sulphate
B.
A graphite rod surrounded by a paste of MnO₂ and carbon
C.
A zinc rod surrounded by zinc chloride paste
D.
A platinum rod with hydrogen gas
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ANSWER :
B. A graphite rod surrounded by a paste of MnO₂ and carbon
4.
The electrolyte used in a Leclanché-type dry cell is a moist paste of:
A.
NaCl and ZnCl₂
B.
KOH and ZnO
C.
H₂SO₄ and PbSO₄
D.
NH₄Cl and ZnCl₂
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ANSWER :
D. NH₄Cl and ZnCl₂
5.
The reaction occurring at the anode of a dry cell during discharge is:
A.
Zn(s) → Zn²⁺(aq) + 2e⁻
B.
Zn²⁺(aq) + 2e⁻ → Zn(s)
C.
2NH₄⁺ + 2e⁻ → 2NH₃ + H₂
D.
MnO₂ + e⁻ → MnO₂⁻
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ANSWER :
A. Zn(s) → Zn²⁺(aq) + 2e⁻
6.
The reaction occurring at the cathode of a dry cell during discharge is:
A.
Zn²⁺ + 2e⁻ → Zn
B.
2H⁺ + 2e⁻ → H₂
C.
Mn²⁺ + 2e⁻ → Mn
D.
MnO₂ + NH₄⁺ + e⁻ → MnO(OH) + NH₃
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ANSWER :
D. MnO₂ + NH₄⁺ + e⁻ → MnO(OH) + NH₃