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ICSE Class 10 Chemistry Question 11 of 23

Model Paper 3 — Question 11

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Question

Question 5(iii)

Distinguish the following by a chemical test:

(a) Ammonia solution and hydrogen chloride gas solution.

(b) Saturated and unsaturated compounds.

(c) Ferrous chloride and ferric chloride.

Answer

(a) Ammonia solution turns moist red litmus blue. Whereas, hydrogen chloride gas turns moist blue litmus red.

(b) On adding bromine water, unsaturated compound decolourises bromine water due to addition reaction across the double or triple bond. However, saturated compound shows no reaction. So, there is no change in colour.

(c) Add a few drops of aqueous NaOH:

  • Ferrous chloride gives a dirty-green precipitate of ferrous hydroxide, Fe(OH)2, which soon turns brown on standing.
  • Ferric chloride gives a reddish-brown precipitate of ferric hydroxide, Fe(OH)3.