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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

NTA Abhyas 2020 · Chemistry · General Principles and Processes of Isolation of Metals

cases Ag _ 2 S + NaCN & → & (A) (A) + Zn & → & (B) cases (B) is a...

{Ag2S+NaCN→(A)(A)+Zn→(B)\begin{cases}{Ag}_{2} \text{S} + \text{NaCN} & \to & \left(\text{A}\right) \\ \left(\text{A}\right) + \text{Zn} & \to & \left(\text{B}\right)\end{cases}

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

Options

  1. A{\text{Na}_{2} \left[\text{Zn}{( \text{CN} )}_{4}\right], \text{Zn}
  2. B{\text{Na}_{2} \left[\text{Ag}{( \text{CN} )}_{2}\right], \text{Ag}
  3. C{\text{Na}_{2} \left[\text{Ag}{( \text{CN} )}_{4}\right], \text{Ag}
  4. D{\text{Na}_{3} \left[\text{Ag}{( \text{CN} )}_{4}\right], \text{Ag}

Correct answer

B. {\text{Na}_{2} \left[\text{Ag}{( \text{CN} )}_{2}\right], \text{Ag}

Step-by-step solution

{Ag2S+4NaCN→2Na[Ag(CN)2]+Na2SA\begin{cases}{Ag}_{2} \text{S} & + & 4 \text{NaCN} & \to & 2 \text{Na} \left[\text{Ag} {\left(\text{CN}\right)}_{2}\right] & + & {Na}_{2} \text{S} \\ & & & & \text{A} & & \end{cases}

{2Na[Ag(CN)2]+Zn→2Ag+Na2[Zn(CN)4]B\begin{cases}2 \text{Na} \left[\text{Ag} {\left(\text{CN}\right)}_{2}\right] & + & \text{Zn} & \to & 2 \text{Ag} & + & {Na}_{2} \left[\text{Zn} {\left(\text{CN}\right)}_{4}\right] \\ & & & & \text{B} & & \end{cases}
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