A) \[NaCl+KN{{O}_{3}}\to NaN{{O}_{3}}+KCl\]
B) \[Ca{{C}_{2}}{{O}_{4}}+2HCl\to CaC{{l}_{2}}+{{H}_{2}}{{C}_{2}}{{O}_{4}}\]
C) \[Mg{{(OH)}_{2}}+2N{{H}_{4}}Cl+MgC{{l}_{2}}+2N{{H}_{4}}OH\]
D) \[Zn+2AgCN\to 2Ag+Zn{{(CN)}_{2}}\]
Correct Answer: D
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