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Hydrogen Peroxide

Given below a...

Question

Given below are the two reactions of $H_{2} O_{2}$ . Mark the correct statement which follows :
(i) $2 K M n O_{4} + 3 H_{2} S O_{4} + 5 H_{2} O_{2} \to K_{2} S O_{4} + 2 M n S O_{4} + 8 H_{2} O + 5 O_{2}$
(ii) $2 C r (O H)_{3} + 4 N a O H + 3 H_{2} O_{2} \to 2 N a_{2} C r O_{4} + 8 H_{2} O$

(i) Shows oxidizing nature of

H_{2} O_{2}

and (ii) shows reducing nature of

H_{2} O_{2}

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In (i)

H_{2} O_{2}

acts as a reducing agent and in (ii) it acts as an oxidizing agent

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In both (i) and (ii),

H_{2} O_{2}

acts as an oxidizing agent

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In both (i) and (ii),

H_{2} O_{2}

acts as a reducing agent

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Solution

The correct option is C In (i) $H_{2} O_{2}$ acts as a reducing agent and in (ii) it acts as an oxidizing agent
In (i) $H_{2} O_{2}$ reduces $K M n O_{4}$ to $M n S O_{4}$ and itself is oxidised to $O_{2}$ .
Oxidation states of Mn in $K M n O_{4}$ and $M n S O_{4}$ are $+ 7$ and $+ 2$ respectively. Decrease in oxidation number is reduction.
In (ii) $H_{2} O_{2}$ oxidises $C r (O H)_{3}$ to $N a C r O_{4}$ and itself is reduced to $H_{2} O .$
Oxidation states of $C r$ in $C r (O H)_{3}$ and $N a C r O_{4}$ are $+ 3$ and $+ 6$ respectively. Increase in oxidation number is oxidation.

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Similar questions

Q. In which of the following reactions

H_{2} O_{2}

acts as a reducing agent?
i)

H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O

ii)

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

iii)

H_{2} O_{2} + 2 e^{-} \to 2 O H^{-}

iv)

H_{2} O_{2} + 2 O H^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O

Q. In which of the following reactions

H_{2} O_{2}

acts as reducing agent?
I.

H_{2} O_{2} + 2 H^{+} + 2 e^{-} \to 2 H_{2} O

II.

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

III.

H_{2} O_{2} + 2 e^{-} \to 2 O H^{-}

IV.

H_{2} O_{2} + 2 O H^{-} - 2 e^{-} \to O_{2} + 2 H_{2} O

Q. In which of the following reactions

H_{2} O_{2}

acts as a reducing agent?
i.

H_{2} O_{2} + 2 H^{\oplus} + 2 e^{⊖} \to 2 H_{2} O

ii.

H_{2} O_{2} - 2 e^{⊖} \to O_{2} + 2 H^{\oplus}

iii.

H_{2} O_{2} + 2 e^{⊖} \to 2 O H^{⊖}

iv.

H_{2} O_{2} + 2 O H^{⊖} - 2 e^{⊖} \to 2 H_{2} O

(IIT-JEE-2014)

Q. Hydrogen peroxide acts both as an oxidising and as a reducing agent, depending upon the nature of the reacting species. In which of the following cases

H_{2} O_{2}

acts as a reducing agent in acid medium?

Question 6

Consider the reactions

(i) $H_{2} O_{2} + 2 H I \to I_{2} + 2 H_{2} O$
(ii) $H O C l + H_{2} O_{2} \to H_{3} O^{+} C l^{-} + O_{2}$

Which of the following statements is correct about $H_{2} O_{2}$ with reference to these reactions? Hydrogen peroxide is ........

(a) an oxidising agent in both (i) and (ii)

(b) an oxidising agent in (i) and reducing agent in (ii)

(d) a reducing agent in both (i) and (ii)

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Given below are the two reactions of H2O2. Mark the correct statement which follows :(i)2KMnO4+3H2SO4+5H2O2→K2SO4+2MnSO4+8H2O+5O2(ii) 2Cr(OH)3+4NaOH+3H2O2→2Na2CrO4+8H2O

Given below are the two reactions of $H_{2} O_{2}$ . Mark the correct statement which follows :
(i) $2 K M n O_{4} + 3 H_{2} S O_{4} + 5 H_{2} O_{2} \to K_{2} S O_{4} + 2 M n S O_{4} + 8 H_{2} O + 5 O_{2}$
(ii) $2 C r (O H)_{3} + 4 N a O H + 3 H_{2} O_{2} \to 2 N a_{2} C r O_{4} + 8 H_{2} O$