Multiple choice

A 1 kg carbon rod was connected to the negative terminal of a battery. A 2 kg copper rod was connected to the positive terminal. Both were dipped in an aqueous solution of copper sulphate and a current was passed for 15 minutes. Which of the following cannot be the mass of the carbon rod after this time?

  1. 1 kg

  2. 2 kg

  3. 2.5 kg

  4. 3 kg
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A Correct answer
Explanation

Some of the copper from the copper rod gets deposited on the carbon rod. Hence, the mass of the carbon rod increases. Hence, its mass must be more than 1 kg. Hence, option (1) is not feasible.

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