Question

A metallic carbide on treatment with water gives a colourless gas which burns readily in air and which gives a precipitate with ammoniacal silver nitrate solution. Gas evolved is.

• A. Methane
• B. Ethane
• C. Acetylene
• D. Ethylen

Answer 1

Answer: (C)

Acetylene

Answer 2

$CaC_{2} + 2H_{2}O \rightarrow Ca(OH)_{2} + C_{2}H_{2}$

$CH \equiv CH + 2\lbrack Ag(NH_{3})_{2}\rbrack OH \rightarrow Ag\underset{\text{Whiteppt.}}{- C \equiv C -}Ag + 4NH_{3} + 2H_{2}O$