$\begin {array} {1 1} (A)\;\text{Hydrochloric acid does not react with chemically pure zinc} \\ (B)\;\text{Hot concentrated sulphuric acid reacts with both zinc and mercury forming metal sulphates and liberating sulphate dioxide} \\ (C)\;\text{Both $Zn$ and $Hg$ react with dilute $HNO_3$ liberating $NO$ gas} \\ (D)\;\text{Both $Zn$ and $Hg$ react with concentrated $HNO_3$ liberating $NO_2$ gas} \end {array}$
