Question

$10$ millimoles of a diacidic base exactly neutralizes $100ml$ of an acid. Then the normality of that acid is?

• A. $0.2N$
• B. $0.1N$
• C. $0.4N$
• D. $0.5N$

Answer 1

The correct option is A $0.2N$

$10$ millimoles of a diacidic base can neutralize $10$ millimoles of a dibasic acid or $20$ moles of a monobasic acid.

For dibasic acid, $10$ millimoles are present in $100ml$ of solution.

$\therefore$ The molarity is $0.1M$ and the normality is $0.2N$.

For a monobasic acid, $20mm$ are present in $100ml$ solution.

$\therefore$ The molarity is $0.2M$ & the normality is $0.2N$ .