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Question

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas (A) and an alkaline solution. The solution on exposure to air produces a thin solid layer of (B) on the surface.
The gas A is:

A
N2
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B
NH3
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C
N2O
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D
None of these
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Solution

The correct option is B NH3
Ca burns in air to form CaO and Ca3N2.
2Ca+O22CaO3Ca+N2Ca3N2
Calcium nitride on hydrolysis with H2O gives ammonia(A)
Ca3N2+6H2O3Ca(OH)2+2NH3(A)
The alkaline solution of Ca(OH)2 thus formed reacts with CO2 present in the air to form CaCO3 (B).
Ca(OH)2+CO2CaCO3(B)+H2O
Thus, A=NH3 and B=CaCO3 (white powder)

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