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An aqueous solution of metal ion \( M_{1} \) reacts separately with reagents \( Q \) and \( R \) in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion \( M_{2} \) always forms tetrahedral complexes with these reagents. Aqueous solution of \( M_{2} \) on reaction with reagent \( S \) gives white precipitate which dissolves in excess of \( S \). The reactions are summarised in the scheme given below
img src=https://penpencil-static-content.s3.ap-south-1.amazonaws.com/5eb393ee95fab7468a79d189/3egj6i68bsw6qz0ylndlkq6kj.png /
\( M_{1}, Q \) and \( R \), respectively are
(a) \( \mathrm{Zn}^{2+}, \mathrm{KCN} \) and \( \mathrm{HCl} \)
(b) \( \mathrm{Ni}^{2+}, \mathrm{HCl} \) and \( \mathrm{KCN} \)
(c) \( \mathrm{Cd}^{2+}, \mathrm{KCN} \) and \( \mathrm{HCl} \)
(d) \( \mathrm{Co}^{2+}, \mathrm{HCl} \) and \( \mathrm{KCN} \)
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