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Preparation of Alkanes with Grignard Reagent

H2O2 is alway...

Question

$H_{2} O_{2}$ is always stored in black bottles because:

A

It is highly unstable

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B

Its enthalpy of decomposition is high

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C

It undergoes autooxidation on prolonged standing

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D

None of these

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Solution

The correct option is C It undergoes autooxidation on prolonged standing
On prolonged standing, hydrogen peroxide undergoes auto oxidation or disproportionation. $2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$ Hence, hydrogen peroxide is always stored in black bottles which cuts off the light and suppresses the auto oxidation.

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Similar questions

H_{2} O_{2}

is not stored in glass bottles.
STATEMENT-2 : Alkali oxides present in glass catalyze the decomposition of

H_{2} O_{2}

.

H_{2} O_{2}

is always stored in black bottles because:

Q. Thermodynamically, hydrogen peroxide is unstable as shown by the following equation:

H_{2} O_{2 (l)} \to H_{2} O_{(l)} + \frac{1}{2} O_{2 (g)}

Δ_{r} G^{o} = - 122.6 k J / m o l

As the reaction from left to right is accompanied by a decrease in free energy, it is a spontaneous process. However, its decomposition at

25^{o} C

in the absence of catalysts is slow. The catalysts which accelerate decomposition are Pt, Ag, cobalt, iron, copper, manganese dioxide and light. Concentrated

H_{2} O_{2}

solution can result into uncontrolled decompositions leading to explosion.

H_{2} O_{2}

thus stored in colored wax-lined bottles (as rough glass surfaces) also causes its decomposition. A few stabilizers such as acids acetanilide, pyrophosphates, and stannates are added to slow down the decomposition of

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H_{2} O_{2}

is stored in colored wax-lined bottles because:

H_{2} O_{2}

is not stored in glass bottle because

Q. During decomposition of

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