1.

`underset(("Sulphide ore")) (A) + NaCN overset ("Air") hArr underset(("Complex"))(B) +Na_(2) S overset(O_(2))rarr C`. Composition of `B` is.A. `Na[Ag(CN)_(2)]`B. `Na_(2)[Ag(CN)_(2)]`C. `Na[Ag(CN)_(4)]`D. `Na_(3)[Ag(CN)_(2)]`

Answer» Correct Answer - A
`underset((A))(Ag_(2)S)+ 4NaCN overset ("air") hArr underset((B))(2Na[Ag(CN)_(2)])+ Na_(2) S`
`Na_(2)S+2O_(2) rarr underset((C))(Na_(2)SO_(4))`.
`B` is `Na[Ag(CN)_(2)]`, a soluble complex.


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