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Excess of ammonia with sodium hypochlori...

Excess of ammonia with sodium hypochloride solution in the presence of glue or gelatine gives

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In the presence of glue of gelatin, excess of ammonia reacts with sodium hypochloride, `NaOCl` and forms hydrazine, `NH_(2)-NH_(2)`.
`underset("(excess)")(2NH_(3))+NaOCl rarr NH_(2)-NH_(2)+NaCl+H_(2)O`.
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