A) \[\operatorname{NaCl} + KN{{O}_{3}} \to NaN{{O}_{3}} + KCl\]
B) \[{{\operatorname{CaCO}}_{2}}+ 2HCl \to CaC{{I}_{2}} + {{H}_{2}}{{C}_{2}}{{O}_{4}}\]
C) \[\operatorname{Mg} {{\left( OH \right)}_{2}} + 2N{{H}_{4}}Cl \to MgC{{l}_{2}} + 2N{{H}_{4}}OH\]
D) \[\operatorname{Zn} +2AgCN \to 2Ag + Zn {{\left( CN \right)}_{2}}\]
Correct Answer: D
Solution :
\[\begin{align} & \operatorname{Zn} + 2AgCN \to 2Ag + Zn {{\left( CN \right)}_{2}} \\ & \operatorname{Zn}\to Z{{n}^{2+}} + {{Z}_{e}}^{-} \\ & \,\,\,\,\,\,\,\,\operatorname{oxidation} \\ & {{\operatorname{Ag}}^{+}}+{{e}^{-}}\to Ag \\ & \operatorname{reduction} \\ \end{align}\] As both oxidation and reduction takes place in this reaction.
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