Chemistry NCERT Exemplar Solutions Class 12th Chapter Five Class 12th Redox Reactions Chemistry

A dilute solution of sulphuric acid is electrolyzed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is __________ cm³. (Nearest Integer).

[Given: Faraday constant F = 96500 C mol^-1 at STP, molar volume of an ideal gas is 22.7 L mol^-1]

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Vishal Baghel | Contributor-Level 10

8 months ago

At anode (oxidation)

2H₂O $\to_{}^{}$ O₂ (g) + 4H⁺ + 4e^-

At cathode (Reduction)

2H⁺ + 2e^- $\to_{}^{}$ H₂ (g)

No. of gm- equivalents = $\frac{i * t}{96500} = \frac{0.1 * 2 * 60 * 60}{96500} = 0.00746$

$V_{O_{2}} = \frac{0.00746}{4} * 22.7 = 0.0423 L$

$V_{H_{2}} = \frac{0.00746}{2} * 22.7 = 0.0846 L$ $V_{t o t a l} ≅ 127 m L$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Five 2025

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