In which of the following reactions ${\mathrm{H}}_2{\mathrm{O}}_2$ acts as a reducing agent ?

$\text{(a) }{\text{H}}_2{\text{O}}_2+2{\text{H}}^{+}+2{\text{e}}^{-}\to 2{\text{H}}_2\text{O}$

$\text{(b) }{\text{H}}_2{\text{O}}_2-2{\text{e}}^{-}\to {\text{O}}_2+2{\text{H}}^{+}$

$\text{(c) }{\text{H}}_2{\text{O}}_2+2{\text{e}}^{-}\to 2{\text{OH}}^{-}$

$\text{(d) }{\text{H}}_2{\text{O}}_2+2{\text{OH}}^{-}-2{\text{e}}^{-}\to {\text{O}}_2+2{\text{H}}_2\text{O}$

• A

  (a) , (b)
• B

  (c) , (d)
• C

  (a) , (c)
• Correct answer
  D

  (b) , (d)

Hence, the correct answer is option: 'D'.