$\begin {array} {1 1} (A)\;4Zn+10HNO_3(dilute) \rightarrow 4Zn(NO_3)_2+N_2O+5H_2O \\ (B)\;3Zn+8HNO_3(dilute) \rightarrow 3Zn(NO_3)_2+2N_2O+4H_2O \\ (C)\;6Hg+8HNO_3(dilute) \rightarrow 3Hg_2(NO_3)_2+2N_2O+4H_2O \\ (D)\;Zn+2OH^-+2H_2O \rightarrow [Zn(OH)_4]^{2-}+H^2 \end {array}$
