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