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Q.

X is a non-volatile solute and Y is a volatile solvent. The following vapour pressures are observed by dissolving X in Y
X/mol lit–1                 Y/mm of Hg
0.10                                 P1
0.25                                 P2
0.01                                 P3
The correct order of vapour pressure is

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a

P3 < P1 < P2

b

P1 < P2 < P3

c

P3 < P2 < P1

d

P2 < P1 < P3

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Lesser is the concentration of solution, greater is the vapor pressure.

 P2​​(0.25M)<P1​(0.1M) <P3 (0.01M)​

Hence, option D is correct.​

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