Question

solution of N is prepared and after hours it is titrated with solution. If the volume of the solution taken is half of the volume of used (in acidic medium), find the molarity of solution?

A

M

B

M

C

M

D

M

Hard
Solution
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Correct option is B)

hours corresponds to half life period for hydrogen peroxide in which its strength will reduce to half.
In hours, the normality of hydrogen peroxide solution will decrease from N to N.
N hydrogen peroxide corresponds to M hydrogen peroxide as its normality is twice its molarity.
.
Thus moles of potassium permanganate reacts with moles of hydrogen peroxide.
Hence, the number of moles of potassium permanganate that will react with L of M hydrogen peroxide solution are moles.
Since double volume of potassium permanganate is take, the molarity of potassium permanganate solution is M.

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