Which of the following represents a redox reaction?

Options

A. `NaOH+HClrarrNaCl+H_(2)O`
B. `BaCl_(2)+H_(2)SO_(4)rarrBaSO_(4)+2HCl`
C. `CuSO_(4)+2H_(2)OrarrCu(OH)_(2)+H_(2)SO_(4)`
D. `Zn+2HClrarrZnCl_(2)+H_(2)`

Answer

D

Explanation

`(a) and (b)` are neutralisation reactions.
c. The oxidation state of `Cu is +2` in both reactant and product, and `SO_(4)^(2-)` ion doens not change. So it is none reaction.
d. It is a redox reaction.
`ZnrarrZn^(2+)+2e^(-)("Oxidation")`
`2H^(o+)+2e^(-)rarrH_(2) ("Reduction")`