Comprehension

Read the following passage and answer the next five questions based on it.

Battery or cell converts chemical energy of the redox reaction to electrical energy. In fuel cells (a galvanic cell), the chemical energy of combustion of fuels like H2, ethanol, etc., is directly converted to electrical energy. In a fuel cell, H2 and O2 react to produce electricity, where H2 gas is oxidized at the anode and oxygen is reduced at the cathode, and the reactions involved are:

Anode reaction: H2 + 2OH- → 2H2O + 2e-

Cathode reaction: O2 + 2H2O + 4e- → 4OH-

67.2 L of H2 at STP reacts in 15 minutes.

Question: 1

The number of moles of hydrogen oxidized is:

Updated On: Feb 26, 2025
  • 0.33 moles
  • 33.3 moles
  • 3.0 moles
  • 1.33 moles
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The Correct Option is C

Solution and Explanation

Using the ideal gas equation, 22.4 L of any gas at STP is equivalent to 1 mole of gas. Therefore, the number of moles of H₂ in 67.2 L is 3.0.
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Question: 2

The number of moles of electrons produced in the oxidation of H$_2$

Updated On: Feb 26, 2025
  • 2 moles
  • 4 moles
  • 1 mole
  • 6 moles
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The Correct Option is D

Solution and Explanation

For every mole of H$_2$, 2 moles of electrons are produced. Since 3.0 moles of H$_2$ are oxidized, the number of moles of electrons produced is 6.
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Question: 3

The quantity of electricity produced in the oxidation of 67.2 L H₂

Updated On: Feb 26, 2025
  • 96500 C
  • 579000 C
  • 193000 C
  • 48250 C
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The Correct Option is B

Solution and Explanation

The total charge is calculated using Q = n × F, where n = 6 moles of electrons and F = 96500 C/mol. Therefore, Q = 6 × 96500 = 579000 C.
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Question: 4

Amount of silver deposited if the current produced is used

Updated On: Feb 26, 2025
  • 324 g
  • 648 g
  • 108 g
  • 216 g
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The Correct Option is B

Solution and Explanation

Using Faraday’s laws of electrolysis, Amount of Ag deposited = $\frac{Q × M} {(n × F)}$ = 648 g.
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Question: 5

The source of electrical energy on the Apollo moon flight was:

Updated On: Feb 26, 2025
  • Lead storage battery
  • A generator set
  • Ni-Cd cells
  • H₂-O₂ fuel cell
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The Correct Option is D

Solution and Explanation

The Apollo moon flight used an H$_2$-O$_2$ fuel cell for electrical energy as it provided a high energy-to-weight ratio and produced water.
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