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 BNH3 Ca burns in air to form CaO and Ca3N2. 2Ca+O2→2CaO3Ca+N2→Ca3N2 Calcium nitride on hydrolysis with H2O gives ammonia(A) Ca3N2+6H2O→3Ca(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+CO2→CaCO3(B)+H2O Thus, A=NH3andB=CaCO3 (white powder)