An increase in the boiling point of the solution depends upon the van’t Hoff factor (i) of the solute when it is added to the solution.
In Option 1-NaOH dissociates into 2 ions,
In Option 2-Na2SO4 dissociates into 3 ions,
In Option 3-NH4NO3 dissociates into 2 ions and
In Option 4-KNO3 dissociates into 2 ions.
Van’t Hoff factor is the maximum for option (ii).
Thus, the maximum increase in the boiling point will be on the addition of 1M Na2SO4 in solution.
Thus, Option (ii) is the correct answer.
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