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Science (086) — CBSE Class 10 board question

Q1. [1]
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
Previously asked in CBSE board exam
2025 31/4/1 Q2
Generated by claude-sonnet-4-6 · 2026-06-15 06:45 · grounding rag
Model Answer

(a) Calcium chloride

Calcium chloride is used as a drying agent to absorb moisture and prepare dry HCl gas, as it does not react with HCl.

Explanation

The other options (CaO, Ca(OH)₂, CaCO₃) are basic substances that would react with acidic HCl gas, not just dry it. Only anhydrous CaCl₂ acts as a neutral drying agent suitable for HCl. Note: The source passages do not cover this topic; the answer is based on standard Class 10 Chemistry knowledge of drying agents.

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Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.