Question

10 millimoles of a di-acidic base exactly neutralize 100 ml of acid. Then, the normality of that acid is:

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

Answer 1

The correct option is A $0.2$ N

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

For a dibasic acid, 10 millimoles are present in 100 ml solution. So the molarity is 0.1 M and the normality is 0.2 N.

For a monobasic acid, 20 millimoles are present in 100 ml solution. Hence the molarity is 0.2 M and the normality is 0.2 N.

In either case, the Normality of the acid will be 0.2 N