A) \[CuS{{O}_{4}}+Fe\,\,\,\,\,FeS{{O}_{4}}+Cu\]
B) \[Ca{{(OH)}_{2}}+C{{O}_{2}}\,\,\,\,\,CaC{{O}_{3}}+{{H}_{2}}O\]
C) \[NaCl+AgN{{O}_{3}}\,\,\,\,\,AgCl+NaN{{O}_{3}}\]
D) \[{{N}_{2}}+3{{H}_{2}}\,\,\,\,\,2N{{H}_{3}}\]
E) None of these
Correct Answer: A
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