In which of the following reactions H2O2 acts as a reducing agent? (1) H2O2 + 2H+ + 2e- → 2H2O (2) H2O2- 2e- → O2 + 2H+ (3) H2O2 + 2e- → 2HO- (4) H2O2 + 2OH- -2e- → O2 + 2H2O

Question

In which of the following reactions H2O2 acts as a reducing agent? (1) H2O2 + 2H+ + 2e- → 2H2O (2) H2O2- 2e- → O2 + 2H+ (3) H2O2 + 2e- → 2HO- (4) H2O2 + 2OH- -2e- → O2 + 2H2O (A) 1,2 (B) 3, 4 (C) 1,3 (D) 2,4

Tardigrade Admin · Accepted Answer

The reducing agent oxidises itself by undergoing oxidation through the loss of electrons. Thus, reducing agent reduces other molecules by supplying electrons to them.

(1) H_{2} O_{2}^{- 1} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O_{2}

In this reaction,

H_{2} O_{2}

undergoes reduction as

O

shows increase in oxidation number.

(2) H_{2} O_{2}^{- 1} - 2 e^{-} \to O_{2}^{o} + 2 H^{+}

In this reaction,

H_{2} O_{2}

undergoes oxidation as it shows decrease in oxidation number. Thus,

H_{2} O_{2}

acts as a reducing agent.

(3) H_{2} O_{2}^{- 1} - 2 e^{-} \to 2 O^{- 2} H^{-}

In this reaction,

H_{2} O_{2}

undergoes reduction.

(4) H_{2} O_{2}^{- 1} - 2 O H^{-} - 2 e^{-} \to O_{2}^{o} + 2 H_{2} 0

In this reaction,

H_{2} O_{2}

undergoes reduction. Thus, acts as a reducing agent.

Q. In which of the following reactions $H_{2} O_{2}$ acts as a reducing agent?
(1) $H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O$
(2) $H_{2} O_{2} - 2 e^{-} \to O_{2} + 2 H^{+}$
(3) $H_{2} O_{2} + 2 e^{-} \to 2 H O^{-}$
(4) $H_{2} O_{2} + 2 O H^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O$

$1, 2$

$3, 4$

$1, 3$

$2, 4$

Q. In which of the following reactions H2​O2​ acts as a reducing agent? (1) H2​O2​+2H++2e−→2H2​O (2) H2​O2​−2e−→O2​+2H+ (3) H2​O2​+2e−→2HO− (4) H2​O2​+2OH−−2e−→O2​+2H2​O

1,2

3,4

1,3

2,4

Q. In which of the following reactions $H_{2} O_{2}$ acts as a reducing agent?
(1) $H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O$
(2) $H_{2} O_{2} - 2 e^{-} \to O_{2} + 2 H^{+}$
(3) $H_{2} O_{2} + 2 e^{-} \to 2 H O^{-}$
(4) $H_{2} O_{2} + 2 O H^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O$

$1, 2$

$3, 4$

$1, 3$

$2, 4$