Skip to content

Assertion (A): It is advised… (Class 10 Science 2023, Q17)

questionbuddy.in/q/cbse-10-science-2023-31-6-1-q17-advised-diluting-acid-should-add

ScienceCBSE Class 10 · Board exam 2023, set 31/6/1 · 1 mark · Assertion-reason

CBSE Class 10 Science 2023: question 17

Set in the CBSE Class 10 board exam of 2023, paper 31/6/1, section A, question 17, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q17 · 1 mark · Assertion-reasonCompetency-basedAcids, Bases and Salts

Assertion (A): It is advised that while diluting an acid one should add water to acid and not acid to water keeping the solution continuously stirred.

Reason (R): The process of dissolving an acid into water is highly exothermic.

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

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/6/1.

Hints

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

Hint 1

Recall the safe way to dilute concentrated sulphuric acid.

Hint 2

Is the order stated in the Assertion correct?

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. Assertion is false: acid must be added slowly to water, not water to acid.

    ½ mark

  2. Reason is true: dissolving an acid in water is highly exothermic, and adding water to acid can make the mixture splash. Hence the answer is option (D).

    ½ mark

Answer: Option (D)

Where the marks are

  • A false, R true (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 paper2023 board paper, set 31/6/1: 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.