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Given below are two… (Class 12 Chemistry SQP 2023-24, Q16)

questionbuddy.in/q/cbse-12-chemistry-2023-24-sqp-q16-labelled-during-electrolysis-aqueous-copper

ChemistryCBSE Class 12 · Sample paper, session 2023-24 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry sample paper 2023-24: question 16

From the official CBSE sample question paper for 2023-24, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · Assertion-reasonCompetency-basedElectrochemistry

Given below are two statements labelled as Assertion (A) and Reason (R)
Assertion (A): During electrolysis of aqueous copper sulphate solution using copper electrodes hydrogen gas is released at the cathode.
Reason (R): The electrode potential of is greater than that of
Select the most appropriate answer from the options given below:

  1. (A)Both A and R are true and R is the correct explanation of A
  2. (B)Both A and R are true but R is not the correct explanation of A.
  3. (C)A is true but R is false.
  4. (D)A is false but R is true.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

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

Hint 1

The species with the higher reduction potential is reduced at the cathode.

Hint 2

Compare Cu²⁺ with H⁺.

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. V is greater than V, so R is true.

  2. Because Cu²⁺ is reduced more easily than H⁺, Cu deposits at the cathode and no H₂ is evolved. So A is false.

    1 mark

Answer: (D)

Where the marks are

  • A false (Cu deposits), R true (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 paperSample paper 2023-24: 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.