1.

When a burning Mg-ribbon is introduced into a jar of colourless gas 'A', the product 'B' is the obtained . 'B' on boiling with water gives a gas 'C' with pungent odour. When 'C' gas is paused over heated cupric oxide, again the gas 'A' is obtained. Identify C.

Answer»

`N_(2)`
`Mg_(3)N_(2)`
`H_(2)O`
`NH_(3)`

Solution :The COMPOUNDS are,
`A = N_2 gas , B = Mg_3 N_2 , C = NH_3`
`3Mg + underset((A))(N_2) overset(DELTA)(rarr) underset((B))(Mg_3N_2)`
`Mg_3N_2 + 6H_2O overset(Delta)(rarr)3Mg(OH)_(2) + 2NH_(3) uarr`
`2NH_3 + 3Cu O overset(Delta)(rarr)3Cu + 3H_2O+ underset((A))(N_2) uarr`.


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