A) \[2Na+2{{H}_{2}}O\xrightarrow{{}}2NaOH+{{H}_{2}}\]
B) \[Cu\xrightarrow{{}}C{{u}^{2+}}+2{{e}^{-}}\]
C) \[C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu\]
D) Both (a) and (b)
Correct Answer: D
Solution :
Increase in oxidation number is called oxidation while decrease in oxidation number is reduction.
In reactions given in option (a) and (b), both oxidation number of metal is increasing, hence in both the reactions, metal is being oxidized.
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