Fuel Cells NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Fuel Cells MCQ Questions


7.
Why are porous electrodes used in fuel cells?
A.
They allow continuous diffusion of gaseous reactants and provide large surface area for reaction
B.
They prevent any chemical reaction from happening
C.
They reduce the EMF of the cell
D.
They allow the electrolyte to escape out of the cell
😑 View Answer Rough Work Error
ANSWER :
A. They allow continuous diffusion of gaseous reactants and provide large surface area for reaction
8.
In the standard hydrogen-oxygen fuel cell, the electrolyte commonly used is:
A.
Aqueous H₂SO₄
B.
Aqueous KOH (alkaline solution)
C.
Molten NaCl
D.
Aqueous CuSO₄
😑 View Answer Rough Work Error
ANSWER :
B. Aqueous KOH (alkaline solution)
9.
The role of the catalyst (Pt, Pd or finely divided metal) in the H₂-O₂ fuel cell is to:
A.
Increase the rate of the electrode reactions (without changing the EMF)
B.
Act as the fuel itself
C.
Increase the EMF of the cell
D.
Decrease the operating temperature only
😑 View Answer Rough Work Error
ANSWER :
A. Increase the rate of the electrode reactions (without changing the EMF)
10.
In a hydrogen-oxygen fuel cell with alkaline electrolyte (KOH), the reaction at the anode is:
A.
2H₂(g) → 4H⁺ + 4e⁻
B.
2H₂(g) + 4OH⁻(aq) → 4H₂O(l) + 4e⁻
C.
4H⁺ + O₂(g) + 4e⁻ → 2H₂O(l)
D.
O₂(g) + 2H₂O(l) + 4e⁻ → 4OH⁻(aq)
😑 View Answer Rough Work Error
ANSWER :
B. 2H₂(g) + 4OH⁻(aq) → 4H₂O(l) + 4e⁻
11.
In an alkaline H₂-O₂ fuel cell, the cathode half-reaction is:
A.
4OH⁻ → O₂ + 2H₂O + 4e⁻
B.
2H₂(g) + 4OH⁻(aq) → 4H₂O(l) + 4e⁻
C.
O₂(g) + 4H⁺ + 4e⁻ → 2H₂O(l)
D.
O₂(g) + 2H₂O(l) + 4e⁻ → 4OH⁻(aq)
😑 View Answer Rough Work Error
ANSWER :
D. O₂(g) + 2H₂O(l) + 4e⁻ → 4OH⁻(aq)
12.
The overall cell reaction in a H₂-O₂ fuel cell is:
A.
H₂(g) + ½O₂(g) → H₂O(g) only
B.
2H₂(g) + O₂(g) → 2H₂O(l)
C.
2H₂O(l) → 2H₂(g) + O₂(g)
D.
4H⁺(aq) + 4OH⁻(aq) → 4H₂O(l)
😑 View Answer Rough Work Error
ANSWER :
B. 2H₂(g) + O₂(g) → 2H₂O(l)