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ICSE Class 10 Chemistry Question 1 of 23

Model Paper 3 — Question 2

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Question

Question 1(ii)

The observation when ammonium salt reacts with caustic soda:

  1. A reddish brown gas
  2. A colourless gas which gives dense white fumes with conc. HCI
  3. A green coloured gas which turns moist blue litmus paper red.
  4. A colourless gas which turns lime water milky.
Answer

A colourless gas which gives dense white fumes with conc. HCI

Reason — When caustic soda (sodium hydroxide) is heated with an ammonium salt, ammonia gas (NH3) is evolved. Ammonia is colourless, has a pungent smell, turns damp red litmus blue, and produces dense white fumes of ammonium chloride (NH4Cl) when it comes in contact with concentrated hydrochloric acid.