Question

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

• A. $HCl$
• B. ${HClO}_4$
• C. ${HNO}_3$
• D. ${H_{3}PO}_4$

Answer 1

The correct option is D ${H_{3}PO}_4$

$H_{3}P{O}_4$ is a weak acid and does not dissociate completely to give a 1N solution. The other acids are strong acids.