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JEE Main 2026 Chemistry question

ChemistryElectrochemistryJEE Main 2026

Electricity is passed through an acidic solution of till all the was exhausted, leading to the deposition of 300 mg of Cu metal. However, a current of 600 mA was continued to pass through the same solution for another 28 minutes by keeping the total volume of the solution fixed at 200 mL. The total volume of oxygen evolved at STP during the entire process is mL. (Nearest integer)

Answer: 111

Solution

Eq of Cu gives mol during deposition. Further electrolysis gives

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Question ID VK-001438