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Question
When an ammonium salt is warmed with sodium hydroxide solution, a gas is evolved. State three ways in which you could identify this gas.
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Solution
\[\ce{NH4Cl + NaOH -> NaCl + H2O + NH3}\]
The gas that evolved is ammonia.
Tests for Ammonia gas:
- It has a sharp, characteristic odour.
- It gives dense white fumes with conc. HCl.
\[\ce{NH3 + HCl -> NH4Cl}\] - It gives light to deep Brown Colour or ppt. with nessler’s solution K2HgI4.
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