Problem

Column-I	Column-II
(A) $\text{SiO}_2$	(P) React with HF
(B) $\text{CN}^-$	(Q) Pseudo halide
(C) $\text{I}^-$	(R) Gives compound with $\text{Cu}^{2+}$ via redox Rxn
(D) $\text{SnO}_2$	(S) Can dissolves in alkali