Which of the following statements are correct?
A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.
B. Aniline can be purified by steam distillation as aniline is miscible in water.
C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.
D. An organic compound is pure, if mixed M.P. is remained same.
Choose the most appropriate answer from the options given below :
A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point.
B. Aniline can be purified by steam distillation as aniline is miscible in water.
C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope.
D. An organic compound is pure, if mixed M.P. is remained same.
Choose the most appropriate answer from the options given below :
- (A)A, B, C only
- (B)A, C, D only✓ Correct
- (C)B, C, D only
- (D)A, B, D only
Answer: (B)
Solution
A is correct: glycerol decomposes at its normal boiling point, so it is purified by reduced-pressure (vacuum) distillation.
B is incorrect: aniline is immiscible (only slightly soluble) in water, though it is indeed steam-distilled.
C is correct: ethanol-water forms an azeotrope and is separated by azeotropic distillation.
D is correct: an unchanged mixed melting point indicates a pure compound.
Hence A, C and D only.
B is incorrect: aniline is immiscible (only slightly soluble) in water, though it is indeed steam-distilled.
C is correct: ethanol-water forms an azeotrope and is separated by azeotropic distillation.
D is correct: an unchanged mixed melting point indicates a pure compound.
Hence A, C and D only.
JEE Main · 2024 · 06 Apr 2024 · Shift 1 · Single correct option