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Hydrides of Group 16

When H 2 O 2 ...

Question

When $H_{2} O_{2}$ is oxidised by a suitable oxidant, the product is

A

O^{2 -}

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B

H O^{2 -}

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C

O H^{-}

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D

O_{2}

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Solution

The correct option is D $O_{2}$
Oxidation of $H_{2} O_{2}$ :
$H_{2} O_{2} + [O] oxidation ⟶ H_{2} O + O_{2} ↑$
Theory :
Decomposition:
Pure $H_{2} O_{2}$ is an unstable liquid and decomposes into water and $O_{2}$ either upon standing or upon heating.
$2 H_{2} O_{2} \to 2 H_{2} O + O_{2}; △ H = - 196.0 k J m o l^{- 1}$
Oxidising nature:
It is a powerful oxidising agent. It acts as an oxidising agent in neutral, acidic or in alkaline medium.
$2 K I + H_{2} O_{2} \to [In neutral medium] 2 K O H + I_{2}$
$2 F e S O_{4} + H_{2} S O_{4} + H_{2} O_{2} \to [In acidic medium] F e_{2} (S O_{4})_{3} + 2 H_{2} O$
$M n S O_{4} + H_{2} O_{2} + 2 N a O H \to [In alkaline medium] M n O_{2} + N a_{2} S O_{4} + 2 H_{2} O$
Reducing nature:
Likely to take up oxygen from strong oxidising agents. Acts as a reducing agent.
$H_{2} O_{2} + O From oxidising agent \to H_{2} O + O_{2}$
Reacts as a reducing agent in acidic, basic or even in neutral medium.
In acidic medium, $H_{2} O_{2} \to 2 H^{+} + O_{2} + 2 e^{-}$
In alkaline medium, $H_{2} O_{2} + 2 O H^{-} \to 2 H_{2} O + O_{2} + 2 e^{-}$
$2 M n O_{4}^{-} + 6 H^{+} + 5 H_{2} O_{2} \to [In acidic medium] 2 M n^{2 +} + 8 H_{2} O + 5 O_{2}$
$2 M n O_{4}^{-} + 3 H_{2} O_{2} \to [In alkaline medium] 2 M n O_{2} + 3 O_{2} + 2 H_{2} O + 2 O H^{-}$

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Similar questions

Q. Balance the following equations by oxidation number method.

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

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H_{2} O_{2}

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The correct order of the O - O bond length in $O_{2}$ , $H_{2} O_{2}$ and $O_{3}$ is

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H_{2} O_{2}

O_{2}

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. How many moles of

H_{2} O_{2}

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1

C l O_{2}

Q. In which of the following reactions

H_{2} O_{2}

acts as a reducing agent?

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Hydrides of Group 16

Standard XII Chemistry

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