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ICSE Class 9 Chemistry Question 24 of 31

Water — Question 24

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24
Question

Question 2(viii)

Assertion (A): Concentrated sulphuric acid absorbs moisture from the atmosphere.

Reason (R): Conc. H2SO4 is a deliquescent substance.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
Answer

A is true but R is false.

Explanation — Concentrated sulphuric acid absorbs moisture (water vapour) from the atmosphere when it is exposed to air but it will not form solution. Such substances are called hygroscopic substances. Hence the assertion (A) is true.
Conc. H2SO4 is hygroscopic substances not deliquescent substance because deliquescent substance absorbs moisture from the air until it dissolves completely in the absorbed water, forming a solution. Hence the reason (R) is false.