On reaction with water, a metal carbide gives a colourless gas which burns readily in air. This gas, when passed through an ammonical silver nitrate solution, forms a precipitate. Identify the evolved gas.

Options

A. `CH_(4)`
B. `C_(2)H_(6)`
C. `C_(2)H_(4)`
D. `C_(2)H_(2)`

Answer

D

Explanation

`CaC_(2) +H_(3)O^(oplus) to Ca(OH)_(2) CH -= CH overset(NH_(4)OH + AgNO_(3)) to Ag^(+)C^(-) -= C^(-) Ag^(+)` (White precipitate)