Paragraph: An aqueous solution of metal ion $\mathbf{M} 1$ reacts separately with reagents $\mathbf{Q}$ and…

Paragraph: An aqueous solution of metal ion $\mathbf{M} 1$ reacts separately with reagents $\mathbf{Q}$ and $\mathbf{R}$ in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of $\mathbf{M} 2$ on reaction with reagent $\mathbf{S}$ gives white precipitate which dissolves in excess of $\mathbf{S}$. The reactions are summarized in the scheme given below:

Question: $\mathbf{M} 1, \mathbf{Q}$ and $\mathbf{R}$, respectively are

1. $\mathrm{Z}{\mathrm{n}}^{2+},\mathrm{ }\mathrm{K}\mathrm{C}\mathrm{N}\mathrm{ }\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{ }\mathrm{H}\mathrm{C}\mathrm{l}$
2. $\mathrm{N}{\mathrm{i}}^{2+},\mathrm{ }\mathrm{H}\mathrm{C}\mathrm{l}\mathrm{ }\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{ }\mathrm{K}\mathrm{C}\mathrm{N}$
3. $\mathrm{C}{\mathrm{d}}^{2+},\mathrm{ }\mathrm{K}\mathrm{C}\mathrm{N}\mathrm{ }\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{ }\mathrm{H}\mathrm{C}\mathrm{l}$
4. $\mathrm{C}{\mathrm{o}}^{2+},\mathrm{ }\mathrm{H}\mathrm{C}\mathrm{l}\mathrm{ }\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{ }\mathrm{K}\mathrm{C}\mathrm{N}$

Asked in: JEE Advanced 2014 (Paper 2)

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