Skip to content

State the chemical property… (Class 10 Science 2025, Q28a)

questionbuddy.in/q/cbse-10-science-2025-31-6-1-q28a-chemical-property-uses-baking-soda

ScienceCBSE Class 10 · Board exam 2025, set 31/6/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 28(a)

Set in the CBSE Class 10 board exam of 2025, paper 31/6/1, section C, question 28(a), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q28(a) · 3 marks · Short answerAcids, Bases and Salts

State the chemical property in each case on which the following uses of baking soda are based upon :

  1. (i)

    as an anti-acids

    0 marks
  2. (ii)

    as a constituent in making baking powder

    0 marks
  3. (iii)

    in soda-acid fire-extinguishers

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/6/1.

Hints

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

Hint 1

Is baking soda acidic or basic? What does a base do to an acid?

Hint 2

Which gas is given off when a hydrogencarbonate reacts with an acid, and how is that gas useful in baking and in fighting fires?

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. (i) Baking soda () is a mild, non-corrosive basic salt. It neutralises excess hydrochloric acid in the stomach, so it works as an antacid.

    1 mark

  2. (ii) When heated, or when it reacts with a mild edible acid such as tartaric acid in baking powder, it releases carbon dioxide: . The makes the dough rise and become soft and spongy.

    1 mark

  3. (iii) In a soda-acid fire extinguisher, baking soda reacts with an acid (sulphuric acid) and produces a large amount of gas. This gas cuts off the air supply and puts out the fire.

    1 mark

Answer: (i) Mild base that neutralises excess acid; (ii) releases CO2 on heating or with an edible acid; (iii) reacts with acid to produce CO2, which extinguishes fire.

Where the marks are

  • Mild basic nature that neutralises excess stomach acid (1 mark)
  • Liberates CO2 on reaction with a mild edible acid or on heating (1 mark)
  • Reacts with acid to give CO2 that extinguishes fire (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 paper2025 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.