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Question:

A mixture of which pair of species react with water to produce a pure colorless gas that gives white fumes with HCl?

Calcium carbide and aluminium nitride

Calcium phosphide and calcium cyanamide

Calcium hydride and Calcium carbide

Magnesium nitride and calcium nitride

Solution:

Ca3N2 + 6H2O → 3Ca(OH)2 + 2NH3
Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3
NH3 gas released in above two reactions give NH4Cl white fumes when reacted with HCl
HCl + NH3 → NH4Cl
Hence, option C is correct.