A) \[CaO+C{{O}_{2}}\to CaC{{O}_{3}}\]
B) \[2Na+2{{H}_{2}}O\to 2NaOH+{{H}_{2}}\]
C) \[N{{H}_{4}}N{{O}_{2}}\to {{N}_{2}}+2{{H}_{2}}O\]
D) \[CuS{{O}_{4}}+2NaOH\to Cu{{(OH)}_{2}}+N{{a}_{2}}S{{O}_{4}}\]
E) None of these
Correct Answer: D
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