$H_{2} O_{2}$ can not be concentrated easily because :

it is very volatile

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it is insoluble in water

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it decomposes at its boiling point

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its boiling point is very high

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Solution

The correct option is C it decomposes at its boiling point
Hydrogen peroxide easily decomposes to water and oxygen before it reaches boiling point. Therefore, it is not concentrated by boiling.
$2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$

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H2O2 can not be concentrated easily because :

The correct option is C it decomposes at its boiling pointHydrogen peroxide easily decomposes to water and oxygen before it reaches boiling point. Therefore, it is not concentrated by boiling.2H2O2→2H2O+O2

$H_{2} O_{2}$ can not be concentrated easily because :

The correct option is C it decomposes at its boiling point
Hydrogen peroxide easily decomposes to water and oxygen before it reaches boiling point. Therefore, it is not concentrated by boiling.
$2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$