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The vapour pressure is least for

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$0.3 m$ aqueous urea

$0.2 m$ aqueous urea

pure water

$0.1 m$ aqueous urea

answer is D.

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Detailed Solution

We know that

Vapour pressure decreases with an increase in no. of solute particles.

Therefore, the solution having a greater number of solute particles has less Vapour pressure.

Since, $0.3 m$ urea has a greater number of solute particles as molality is directly proportional to no. of moles.

Therefore, $0.3 m$ urea has the least vapour pressure.

Hence, option(d) is correct.

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