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When Sodium bicarbonate reacts… (Class 10 Science 2023, Q1)

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ScienceCBSE Class 10 · Board exam 2023, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 1

Set in the CBSE Class 10 board exam of 2023, paper 31/4/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQAcids, Bases and Salts

When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is :

  1. (A)Hydrogen; it gives pop sound with burning match stick.
  2. (B)Hydrogen; it turns lime water milky.
  3. (C)Carbon dioxide; it turns lime water milky.
  4. (D)Carbon dioxide; it blows off a burning match stick with a pop sound.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/4/1.

Hints

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

Hint 1

Bicarbonates contain carbonate-type ions; think about what gas they release with an acid.

Hint 2

Which gas reacts with Ca(OH)2 to form a white precipitate?

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. . The gas given off is carbon dioxide.

  2. turns lime water milky because insoluble forms. This makes option (C) correct.

    1 mark

Answer: Carbon dioxide; turns lime water milky, option (C)

Where the marks are

  • Identifies CO2 and the lime water test, option (C) (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 31/4/1: 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.