Chemistry
The observation when ammonium salt reacts with caustic soda:
- A reddish brown gas
- A colourless gas which gives dense white fumes with conc. HCI
- A green coloured gas which turns moist blue litmus paper red.
- A colourless gas which turns lime water milky.
Practical Chemistry
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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.
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