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

1 mole of acid dissolved in one liter water will give 1N solution only if the acids have basicity value or n factor equals to 1.  then it will give 1N solution from 1 mole is 1 liter. HCl, HClO₄​ and HNO_3​ are all monobasic (n factor 1) ,             but H₃​PO₄​ has basicity value 3. So, it won't give 1N solution.