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In order to prepare dry… (Class 10 Science 2025, Q2)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 2

Set in the CBSE Class 10 board exam of 2025, 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

In order to prepare dry hydrogen chloride gas in humid atmosphere the gas produced is passed through a guard tube (drying tube) which contains :

  1. (A)Calcium chloride
  2. (B)Calcium oxide
  3. (C)Calcium hydroxide
  4. (D)Calcium carbonate

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

The drying agent must not react with an acidic gas.

Hint 2

Rule out the basic compounds.

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 guard tube needs a drying agent that absorbs moisture but does not react with HCl gas.

  2. Anhydrous calcium chloride is a neutral drying agent and does not react with HCl. CaO, Ca(OH) and CaCO are basic and would react with the acid. Option (A).

    1 mark

Answer: (A) Calcium chloride

Where the marks are

  • Chooses calcium chloride as the drying agent (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 31/4/1: 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.