Van't Hoff factor for 0.1 M MgSO₄ solution is 1.42 and for 0.001M MgSO₄ solution is 1.92. What is van't Hoff factor for 0.01 M MgSO₄ solution is

When concentration is low, electrolyte gets more space to dissociate more and hence, number of ions in the solutions gets increased. Therefore, van't Hoff factor for dissociation increases.

In the given problem, the van't Hoff factor of 0.01 M MgSO₄ is more than 0.1 M MgSO₄ solution but less than 0.001M MgSO₄ solution.

Hence, option (A) is the suitable option.