Hydrogen peroxide cannot be concentrated easily because:

it is highly volatile in nature

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it does not dissolve in

H_{2} O

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it decomposes at its boiling point

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it has a very high boiling point

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Solution

The correct option is D it decomposes at its boiling point
Hydrogen peroxides cannot be concentrated easily because it decomposes at its boiling point.

Dilute $H_{2} O_{2}$ is concentrated to about $50 %$ by slow evaporation on a water bath. It is further concentrated to $90 %$ in a vacuum desiccator using conc. $H_{2} S O_{4}$ as a dehydrating agent.

Further concentration to $99 %$ is obtained by distillation under reduced pressure.

Option C is correct.

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Similar questions

Q. A substance which decomposes at or below its boiling point cannot be purified by?

Conc. sulphuric acid is used as it is non volatile and has a high boiling point.

Explain, why (or give reasons for)
(i) In the laboratory preparation of hydrogen chloride from sodium chloride, the gas can be obtained below 200°C or above. But the lower temperature is preferred.
(ii) Hydrogen chloride is not collected over water.
(iii) Hydrochloric acid cannot be concentrated above 22.2% by boiling.
(iv) HCl gas does not conduct electricity, but hydrochloric acid conducts electricity.
(v) Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.
(vi) When the stopper of a bottle full of HCl gas is opened there are fumes in the air.
(vii) A solution of HCl gas in water turns blue litmus red and conducts electricity, while HCl gas dissolves in toluene and it has no effect on litmus and does not conduct electricity.
(viii) An aqueous solution of chlorine is acidic in nature.

This method is used to purify liquids having very high boiling points and those, which decompose at or below their boiling points.

Q. Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point )?

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