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O2 gas will be evolved as a product of electrolysis of : (A) an aqueous solution of AgNO3 using silver electrodes. (B) an aqueous solution of AgNO3 using platinum electrodes. (C) a dilute solution of H2SO4 using platinum electrodes. (D) a high concentration solution of H2SO4 using platinum electrodes. Choose the correct answer from the options given below :

1. (B) and (C) only
2. (A) and (D) only
3. (B) and (D) only
4. (A) and (C) only

Correct answer: (A) and (D) only

Solution

O2 gas is produced during the electrolysis of water or acidic solutions when the oxidation of water occurs at the anode. In option (A), using silver electrodes in AgNO3 solution allows for the oxidation of water, while in option (D), the high concentration of H2SO4 facilitates the same process, leading to the evolution of O2.

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