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Standard electrode potential… (Class 12 Chemistry 2025, Q2)

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ChemistryCBSE Class 12 · Board exam 2025, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2025: question 2

Set in the CBSE Class 12 board exam of 2025, paper 56/1/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQElectrochemistry

Standard electrode potential for couple is +0.15 V and that for the couple is –0.74 V. The two couples in their standard states are connected to make a cell. The cell potential will be

  1. (A)+1.19 V
  2. (B)+0.89 V
  3. (C)+0.18 V
  4. (D)+1.83 V

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 56/1/1.

Hints

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

Hint 1

Decide which couple has the lower reduction potential; that couple is the anode.

Hint 2

Use .

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. The couple with the lower reduction potential, , acts as the anode. acts as the cathode.

  2. V, which is option (B).

    1 mark

Answer: +0.89 V, option (B)

Where the marks are

  • Uses and obtains +0.89 V (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 paper2025 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.