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Which of the following electrolyte can be used to obtain H 2 S 2 O 8 by the process of electrolysis?

1. Dilute solution of sodium sulphate
2. Dilute solution of sulphuric acid
3. Concentrated solution of sulphuric acid
4. Acidified dilute solution of sodium sulphate.

Correct answer: Concentrated solution of sulphuric acid

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