| Column I | Column II | |---|---| |

CHEMISTRY · Subjective

Problem

Column I	Column II
(a) $\text{SiO}_2$	(p) Reacts with $\text{HF}$
(b) $\text{CN}^-$	(q) Pseudohalide
(c) $\text{I}^-$	(r) Gives a compound with $\text{Cu}^{2+}$ via a redox reaction
(d) $\text{SnO}_2$	(s) Can dissolve in alkali