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Assertion (A): For… (Class 12 Chemistry SQP 2024-25, Q14)

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ChemistryCBSE Class 12 · Sample paper, session 2024-25 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry sample paper 2024-25: question 14

From the official CBSE sample question paper for 2024-25, section A, question 14, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q14 · 1 mark · Assertion-reasonCompetency-basedElectrochemistry

Assertion (A): For strong electrolytes, there is a slow increase in molar conductivity with dilution and can be represented by the equation
Reason (R): The value of the constant 'A' for NaCl, , and in a given solvent and at a given temperature is different.

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 2024-25.

Hints

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

Hint 1

Check the equation in the assertion carefully.

Hint 2

Which quantity is the limiting molar conductivity?

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 Debye–Hückel–Onsager equation is . The equation given in A is wrong, so A is false.

  2. A depends on the type of electrolyte (1:1, 2:1, 2:2), so it differs for NaCl, CaCl and MgSO. R is true. Option (D).

    1 mark

Answer: Option (D)

Where the marks are

  • Spots the incorrect equation and confirms R (1 mark)

Revise the chapter

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 2024-25: 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.