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An aqueous solution of a salt… (Class 10 Science 2024, Q2)

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ScienceCBSE Class 10 · Board exam 2024, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 2

Set in the CBSE Class 10 board exam of 2024, paper 31/4/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQAcids, Bases and Salts

An aqueous solution of a salt turns blue litmus to red. The salt could be the one obtained by the reaction of :

  1. (A) and
  2. (B) and
  3. (C) and
  4. (D) and

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/4/1.

Hints

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

Hint 1

Is the salt acidic or basic?

Hint 2

An acidic salt comes from a strong acid and a weak base.

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. A salt that turns blue litmus red is acidic, so it comes from a strong acid and a weak base.

  2. HCl is a strong acid and is a weak base, so they give , which is acidic.

    1 mark

Answer: (D) HCl and NH4OH

Where the marks are

  • Chooses the strong acid + weak base pair (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Acids, Bases and Salts, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/4/1: 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.