1.

'B' is a weak basic aqueous NH_(3) solution

Answer»

`NH_(4)OH`
`NH_(4)CL`
`NH_(4)NO_(2)`
`(NH_(4))_(3)PO_(4)`

Solution :`CaNCN+5H_(2)O to 2CaCO_(3)+UNDERSET(N)(2NH_(4)OH`


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