In which of the following reactions `H_(2)O_(2)` acts as a reducing agent ?

Options

A. `H_(2)O_(2)+2H^(+)+2e^(-)rarr 2H_(2)O`
B. `H_(2)O_(2)+2e^(-)rarr O_(2)+2H^(+)`
C. `H_(2)O_(2)+2e^(-)rarr 2OH^(-)`
D. `H_(2)O_(2)+2OH^(-)-2e^(-)rarrO_(2)+2H_(2)O`

Answer

D

Explanation

The reducing agent loses electron during redox reaction i.e. oxidises itself.
(a) `H_(2)overset(-1)(O_(2))+2H^(+)+2e^(-)rarr 2H_(2)overset(-2)(O)" (Red.)"`
(b) `H_(2)overset(-l)(O_(2))rarr overset(0)(O_(2))+2H^(+)+2e^(-)(Ox.)`
(c ) `H_(2)overset(-1)(O_(2))+2e^(-)rarr 2overset(-2)O^(-)" (Red.)"`
(d) `H_(2)overset(-1)(O_(2))+2OH^(-)rarr overset(0)(O_(2))+H_(2)O+2e^(-)(Ox.)`