A) \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\]
B) \[CuO+{{H}_{2}}\to Cu+{{H}_{2}}O\]
C) \[CaO+2HCl\to CaC{{l}_{2}}+{{H}_{2}}O\]
D) \[NaOH+HCl\to NaCl+{{H}_{2}}O\]
Correct Answer: B
Solution :
In the given reaction \[{{H}_{2}}\] is oxidised to \[{{H}_{2}}O\] and \[\text{CuO}\] is reduced to Cu. As oxidation and reduction are taking place simultaneously, it is called a redox reaction.
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