On dissolving 1 mole of each of the following acids in 1 litre water, the acid which does not give a solution of strength 1N is -

Options

A. HCl
B. Perchloric acid
C. `HNO_(3)`
D. Phosphoric acid

Answer

D

Explanation

`H_(3)PO_(4)iffH^(+)+H_(2)PO_(4)^(-)`
`H_(2)PO_(4)^(-)iffH^(+)+HPO_(4)^(2-)`
`HPO_(4)^(2-)iffH^(+)+PO_(4)^(3-)`
Phosphoric acid does not give 1N strength.