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What will happen during the… (Class 12 Chemistry 2026, Q5)

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ChemistryCBSE Class 12 · Board exam 2026, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2026: question 5

Set in the CBSE Class 12 board exam of 2026, paper 56/1/1, section A, question 5, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q5 · 1 mark · MCQElectrochemistry

What will happen during the electrolysis of aqueous solution of by using platinum electrodes ?

  1. (A)Cu will deposit at Anode
  2. (B) gas will be released at cathode
  3. (C) gas will be released at anode
  4. (D) gas will be released at anode

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 56/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Compare the reduction of with that of water.

Hint 2

Recall the overpotential of oxygen at the anode.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. At the cathode, is reduced in preference to water, so copper deposits there.

  2. At the anode, is oxidised in preference to water because of the overpotential for . So is released at the anode: option (D).

    1 mark

Answer: Option (D)

Where the marks are

  • Chooses at the anode (1 mark)

Revise the chapter

  • Chapter: Electrochemistry (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Electrochemistry, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 56/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.