First slide

Compounds of hydrogen

Question

In which of the following reaction H₂O₂ acts as a reducing agent?
(P) $H_{2} O_{2} + {2H}^{+} + 2 e^{-} \to 2 H_{2} O$
(Q) $H_{2} O_{2} - 2 e^{-} \to O_{2} + {2H}^{+}$
(R) $H_{2} O_{2} + 2 e^{-} \to {2OH}^{-}$
(S) $H_{2} O_{2} + {2OH}^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O$

Moderate

A

P, R
B

Q, S
C

P, Q
D

R, S

Solution

$P) H_{2} O_{2} (aq) acting as an oxidizing agent in an acidic solution. Write the balanced equation.$
$H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to {2H}_{2} O$
$Q) H_{2} O_{2} (aq) acting as a reducing agent in an acidic solution. Write the balanced equation.$
$H_{2} O_{2} (aq) \to O_{2} + 2 H^{+} + 2 e^{-}$
$R) H_{2} O_{2} (aq) acting as an oxidizing agent in basic solution. Write the balanced equation$
$H_{2} O_{2} + 2 e^{-} \to 2 {OH}^{-}$
$S) H_{2} O_{2} (aq) acting as an reducing agent in basic solution. Write the balanced equation$
$H_{2} O_{2} + 2 {OH}^{-} - 2 e^{⊖} \to O_{2} + 2 H_{2} O$
$∴$ Correct answer is (2)

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