1.

`underset(("Sulphide ore")) (A) + NaCN overset ("Air") hArr underset(("Complex"))(B) +Na_(2) S overset(O_(2))rarr C`. `A` is.A. `As_(2) S`B. `CuS`C. `Na_(2) S`D. `HgS`

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))`.
`A` is `Ag_(2) S`.


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