question_answer

Which of the following shows a metal being oxidised?

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  and , both oxidation number of metal is increasing, hence in both the reactions, metal is being oxidised.