Question

An aqueous solution of metal ion $M1$ reacts separately with reagents $Q$ and $R$ 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 $M2$ on reaction with reagent $S$ gives white precipitate which dissolves in excess of $S$. The reactions are summarized in the scheme given below.

$M1, Q$ and $R$, respectively are

• A. $Zn ^{2+}, KCN$ and $HCl$
• B. $Ni ^{2+}, HCl$ and $KCN$
• C. $Cd ^{2+}, KCN$ and $HCl$
• D. $Co ^{2+}, HCl$ and $KCN$

Answer 1

Answer: (B)

Correct answer is (b) $Ni ^{2+}, HCl$ and $KCN$