An aqueous solution of phosphoric acid, $H_{3} P O_{4}$ being titrated has molarity equal to 0.25 M. Which of the following could be normality of this solution ?

0.25 N

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0.50 N

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0.75 N

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None of these

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Solution

The correct option is B 0.75 N
Phosphoric acid is a tribasic acid, its n-factor is 3.

Normality $= M o l a r i t y \times n - f a c t o r$

$= 0.25 \times 3$

$= 0.75$

Hence, option C is correct.

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