Ammonium ion is detected by the addition of an alkali.

True

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False

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Solution

The correct option is A True
Hydrogen chloride gas gives dense white fumes (of ammonium chloride) with ammonium hydroxide.
$H C l + N H_{4} O H \to N H_{4} C l + H_{2} O$
Ammonium ion is detected by the addition of an alkali.
Ammonium salts when heated with alkali, give ammonia.
$N H_{4} C l + N a O H \to N a C l + N H_{3} ↑ + H_{2} O$
Evolution of ammonia gas can be detected by paper dipped in $C u S O_{4}$ solution. Ammonia changes the colour of this paper to deep blue due to formation of tetrammine copper complex.
$C u S O_{4} + 4 N H_{3} \to [C u (N H_{3})_{4}] S O_{4}$

Suggest Corrections

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