Ag(2)S + NaCN rarr (A),(A) + Zn rarr (B)...

`Ag_(2)S + NaCN rarr (A),(A) + Zn rarr (B)`
`(B)` is a metal. Hence, `(A)` and `(B)` are

A

`Na_(2)[Zn(CN)_(4)], Zn`

B

`Na[Ag(CN)_(2)], Ag`

C

`Na_(2)[Ag)CN)_(4)], Ag`

D

`Na_(3)[Ag(CN)_(4)], Ag`

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The correct Answer is:

B

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