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  4. A metallic carbide on treatment with water gives a colourless gas which bums readily in air and gives a precipitate with ammonical silver nitrate.The gas is

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Q. A metallic carbide on treatment with water gives a colourless gas which bums readily in air and gives a precipitate with ammonical silver nitrate.The gas is

Hydrocarbons

Solution:

$CaC_2 + 2H_2O \rightarrow Ca(OH)_2 + C_2H_2$
$C_2H_2 + \underset{\text{air}}{5/2 \,O_2} \rightarrow 2CO_2 + H_2O$
$ HC \equiv CH + 2[Ag(NH_3)_2]OH \rightarrow$
$\underset{\text{white ppt}}{AgC \equiv CAg } + 2H_2O + 4 NH_3$