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Few drops of aqueous solution… (Class 10 Science 2023, Q2)

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ScienceCBSE Class 10 · Board exam 2023, set 31/6/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 2

Set in the CBSE Class 10 board exam of 2023, paper 31/6/1, 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

Few drops of aqueous solution of ammonium chloride are put on a universal indicator paper. The paper turns pink. Study the following table and choose the correct option.

NatureAmmonium chloride is a salt of ....Range of pH
(a)acidicweak acid and strong baseless than 7
(b)basicweak acid and strong basemore than 7
(c)acidicstrong acid and weak baseless than 7
(d)basicstrong acid and strong base7
  1. (A)acidic; weak acid and strong base; less than 7
  2. (B)basic; weak acid and strong base; more than 7
  3. (C)acidic; strong acid and weak base; less than 7
  4. (D)basic; strong acid and strong base; 7

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

What does a pink colour on universal indicator tell you?

Hint 2

Name the acid and the base that form NH4Cl, and judge the strength of each.

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. Universal indicator turning pink shows the solution is acidic, so its pH is less than 7.

  2. is formed from (a strong acid) and (a weak base). Its solution is therefore acidic. Hence the answer is option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • Acidic; salt of strong acid and weak base; pH < 7 (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.