Chemistry - Concentration Terms Question with Solution | TestHub

ChemistryConcentration TermsVolume StrengthMedium2 minQB

ChemistryMediumsingle choice

Passage / Comprehension

The strength of an $H_{2} O_{2}$ sample is generally expressed in terms of its volume strength. This refers to the volume of oxygen liberated at N.T.P. by heating one volume of hydrogen peroxide. The concentration of $H_{2} O_{2}$ in a solution can also be expressed as a percentage of $H_{2} O_{2}$ in the solution. The normality of this solution can be calculated if the equivalent mass of $H_{2} O_{2}$ is known.

The volume strength of the $H_{2} O_{2}$ solution is:

Options:

Answer:

Solution:

$H_{2} O_{2} + 2 KI + H_{2} SO_{4} \to K_{2} SO_{4} + I_{2} + 2 H_{2} O$

$I_{2} + Na_{2} S_{2} O_{3} \to 2 NaI + N a_{2} S_{4} O_{6}$

4 mmol of hypo means 2 mmole of

I_{2}

and 2 mmole of

H_{2} O_{2}

so molarity $= \frac{2}{25}$ , normality $= \frac{4}{25} = 0.16 N$

And volume strength $= \frac{2}{25} \times 11.2 V = 0.896 V$

Stream:JEESubject:ChemistryTopic:Concentration TermsSubtopic:Volume Strength

⏱ 2mℹ️ Source: QB

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