Which of the following aqueous solutions should have the highest boiling point? (i) 1.0 MNaOH (ii...

Which of the following aqueous solutions should have the highest boiling point?
(i) 1.0 MNaOH
(ii) 1.0 MNa_2SO_4
(iii) 1.0 MNH_4NO_3
(iv) 1.0 MKNO_3

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