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# In which of the following reactions $H_2O_2$ acts as a reducing agent ?

$\begin{array}{1 1}(1)\;H_2O_2+2H^++2e^-\rightarrow 2H_2O\\(2)\;H_2O_2-2e^-\rightarrow O_2+2H^+\\(3)\;H_2O_2+2e^-\rightarrow 2OH^-\\(4)\;H_2O_2+2OH^+-2e^-\rightarrow O_2+2H_2O\end{array}$

$\begin{array}{1 1}(a)\;(1),(3)\\(b)\;(2),(4)\\(c)\;(1),(2)\\(d)\;(3),(4)\end{array}$

(2),(4)
Hence (b) is the correct answer.