Question
$$Zn$$ gives $${H_2}$$ gas with $${H_2}S{O_4}$$ and $$HCl$$ but not with $$HN{O_3}$$ because
A.
$$Zn$$ acts as an oxidising agent when react with $$HN{O_3}.$$
B.
$$HN{O_3}$$ is weaker acid than $${H_2}S{O_4}$$ and $$HCl.$$
C.
In electrochemical series $$Zn$$ is above hydrogen.
D.
$$NO_3^ - \,ion$$ is reduced in preference to hydroniumion.
Answer :
$$NO_3^ - \,ion$$ is reduced in preference to hydroniumion.
Solution :
$$NO_3^ - \,ion$$ are reduced by nascent hydrogen
$$\eqalign{
& {\text{Metal}} + HN{O_3} \to {\text{Metal nitrate}} + \left[ H \right] \cr
& HN{O_3} + 8\left[ H \right] \to {N_2}O + 5{H_2}O \cr} $$