1.

The compound 'C' is used to make urea and Thio urea.

Answer»

`NH_(2)CN`
`NH_(4)CN`
`(NH_(4))_(3)PO_(4)`
`NH_(4)OH`

Solution :`CaNCN+H_(2)SO_(4)tounderset(C )(NH_(2)CN+CaSO_(4)`


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