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JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Practical and Analytical Chemistry

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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: A mixture contains benzoic acid and napthalene. The pure benzoic acid can be separated out by the use of benzene.
Reason R: Benzoic acid is soluble in hot water.
In the light of the above statements, choose the most appropriate answer from the options given below.
  1. (A)Both A and R are true and R is the correct explanation of A.
  2. (B)Both A and R are true but R is NOT the correct explanation of A.
  3. (C)A is true but R is false.
  4. (D)A is false but R is true.✓ Correct

Answer: (D)

Solution

Benzoic acid and naphthalene can be effectively separated by crystallization using hot water. Benzoic acid is soluble in hot water, whereas naphthalene is insoluble. Benzene would not be effective for this separation since both compounds are soluble in benzene. Therefore, the assertion is incorrect (benzene is not the appropriate solvent), but the reason is correct (benzoic acid is indeed soluble in hot water).

JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Single correct option

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