# A 30 % solution of ${{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}$ is marketed as ‘100 volume’ hydrogen peroxide.Reason: 1L of 30 % ${{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}$ will give 100 mL of oxygen at STP.A. Both assertion and reason are correct and reason is the correct explanation for assertion.B. Both assertion and reason are correct and reason is not the correct explanation for assertion.C. Assertion is correct but reason is incorrect.D. Both assertion and reason are incorrect.

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Hint:
The percentage of any solution is generally expressed in three ways: as ‘percentage by mass’ or as ‘percentage by volume’ or as ‘mass by volume’.
Percentage by mass is weight/ weight or w/ w and percentage by volume is weight/ volume or w/ v.

In case of a liquid dissolved in a liquid, the percentage by mass has the same meaning but the percentage by volume denotes the volume of the liquid solute in ${\text{c}}{{\text{m}}^{\text{3}}}$ present in 100 ${\text{c}}{{\text{m}}^{\text{3}}}$ of the solution. This means it is volume/ volume or v/ v.
Therefore, the statement ‘30 % solution of ${{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}$ is marketed as ‘100 volume’ hydrogen peroxide’ is correct as 30 % solution of ${{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}$ means 30 grams of hydrogen peroxide present in 100 mL of the solution. It is not because 1L of 30 % ${{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}$ will give 100 mL of oxygen at STP. Also, 1 millilitre of 30 % ${{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}$ will give 100 mL of oxygen at STP.