Ag 2 S + NaCN → A A + Zn → B (B) is a metal. Hence, (A) and (B) are, Na 2 Zn ( CN ) 4 , Zn, Na 2 Ag ( CN ) 2 , Ag, Na 2 Ag ( CN ) 4 , Ag, Na 3 Ag ( CN ) 4 , Ag

Ag 2 S + 4 NaCN → 2 Na Ag CN 2 + Na 2 S A 2 Na Ag CN 2 + Zn → 2 Ag + Na 2 Zn CN 4 B

Ag 2 S + NaCN → A A + Zn → B (B) is a metal. Hence, (A) and (B) are

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\begin{matrix} {Ag}_{2} S + NaCN & \to & (A) \\ (A) + Zn & \to & (B) \end{matrix}

(B) is a metal. Hence, (A) and (B) are

ChemistryGeneral Principles and Processes of Isolation of MetalsJEE Main

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The correct answer is:

{Na}_{2} [Ag {(CN)}_{2}], Ag

\begin{matrix} {Ag}_{2} S & + & 4 NaCN & \to & 2 Na [Ag {(CN)}_{2}] & + & {Na}_{2} S \\ A \end{matrix}

\begin{matrix} 2 Na [Ag {(CN)}_{2}] & + & Zn & \to & 2 Ag & + & {Na}_{2} [Zn {(CN)}_{4}] \\ B \end{matrix}

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