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JEE Main levelSingle correct optionDifficulty 2 of 3si081

The solubility of a solid (g per 100 mL) in four solvents at $2 5^{\circ} C$ and at the boiling point is: A, 20 and 22; B, 0.5 and 0.6; C, 1.0 and 18; D, 25 and 40. The solvent giving the highest percentage recovery on recrystallisation from a hot saturated solution cooled to $2 5^{\circ} C$ is

AA
BC
CB
DD

Answer: B

Recovery

= (S_{h o t} - S_{co l d}) / S_{h o t} \times 100

: A = 9.1%, B = 16.7%, C = 94.4%, D = 37.5%. Solvent C dissolves much more when hot than cold, so it is best.

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