JEE Main Chemistry question

At a constant temperature, which of the following aqueous solutions will have the maximum vapour pressure? (Mol. wt NaCl , ) [Guj CET 2010]

(A)1 molal NaCl (aq)Correct
(B)1 molar NaCl (aq)
(C)1 molal (aq)
(D)1 molar (aq)

Answer: (A)

Solution

A 1 molar solution is more concentrated than a 1 molal solution of the same solute (since the solution's total volume in the molar case contains somewhat less solvent mass than exactly 1 kg). Also, furnishes 3 ions in solution on dissociation while

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Question ID VK-143056