A) \[CdS\]
B) \[Sn{{S}_{2}}\]
C) \[C{{d}^{2+}}\]
D) \[S{{n}^{2+}}\]
Correct Answer: C
Solution :
[a]\[\underset{Yellow}{\mathop{CdS}}\,\downarrow +{{(N{{H}_{4}})}_{2}}S\xrightarrow{{}}\underset{Yellow}{\mathop{CdS}}\,\downarrow \xrightarrow{{{(N{{H}_{4}})}_{2}}{{S}_{2}}}\underset{\text{Insoluble}}{\mathop{CdS\downarrow }}\,\] [b]\[Sn{{S}_{2}}\downarrow +{{(N{{H}_{4}})}_{2}}S\xrightarrow{{}}\underset{Yellow}{\mathop{Sn{{S}_{2}}}}\,\downarrow \xrightarrow{{{(N{{H}_{4}})}_{2}}{{S}_{2}}}\underset{\text{Soluble}}{\mathop{{{(N{{H}_{4}})}_{2}}}}\,Sn{{S}_{3}}\] [c]\[C{{d}^{2+}}+{{(N{{H}_{4}})}_{2}}S\xrightarrow{{}}\underset{Yellow}{\mathop{CdS}}\,\downarrow \xrightarrow{{{(N{{H}_{4}})}_{2}}{{S}_{2}}}\underset{\text{Insoluble}}{\mathop{CdS\downarrow }}\,\] [d]\[S{{n}^{2+}}+{{(N{{H}_{4}})}_{2}}S\xrightarrow{{}}\underset{Brown}{\mathop{SnS\downarrow }}\,\xrightarrow{{{(N{{H}_{4}})}_{2}}{{S}_{2}}}\underset{\begin{smallmatrix} (Amm.\,\,\text{thiostannate)} \\ \text{Soluble} \end{smallmatrix}}{\mathop{{{(N{{H}_{4}})}_{2}}Sn{{S}_{3}}}}\,\]
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