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Question:

Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing 0.2 Faraday electricity through an aqueous solution of potassium succinate, the total volume of gases (at both cathode and anode) at STP (1 atm and 273 K) is 5 L. True or False?

True

False

Solution:

KCOO⁻CH₂⁻CH₂⁻COOK + 2H₂O → CH₂=CH₂(anode) + 2CO₂ + H₂(cathode) + 2KOH
Total equivalents of C₂H₄ + CO₂ + H₂ = 0.2 + 0.2 + 0.2 = 0.6
Total moles of gases = 0.2/2 + 0.2/1 + 0.2/2 = 0.4
V = nRT/P = 0.4 × 0.0821 × 273/1 = 8.96 L