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Dilution affects both… (Class 12 Chemistry 2024, Q11)

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ChemistryCBSE Class 12 · Board exam 2024, set 56/5/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2024: question 11

Set in the CBSE Class 12 board exam of 2024, paper 56/5/1, section A, question 11, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q11 · 1 mark · MCQElectrochemistry

Dilution affects both conductivity as well as molar conductivity. Effect of dilution on both is as follows :

  1. (A)both increase with dilution.
  2. (B)both decrease with dilution.
  3. (C)conductivity increases whereas molar conductivity decreases on dilution.
  4. (D)conductivity decreases whereas molar conductivity increases on dilution.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 56/5/1.

Hints

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

Hint 1

Conductivity depends on the number of ions per unit volume.

Hint 2

Molar conductivity refers to the ions from one mole of electrolyte.

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. On dilution there are fewer ions per unit volume, so conductivity () decreases.

  2. Molar conductivity, , increases because the total volume containing 1 mol of electrolyte rises. Option (D).

    1 mark

Answer: Option (D)

Where the marks are

  • States that κ decreases and Λm increases on dilution (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 paper2024 board paper, set 56/5/1: 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.