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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 solution formed by adding carbon disulfide to acetone shows negative deviation from Raoult's law. Reason (R): In a mixture of carbon disulfide and acetone, the dipolar interactions between solute-solvent molecules are weaker than the respective interactions among the solute-solute and solvent-sol

Options

  1. ABoth (A) and (R) are true and (R) is the correct explanation of (A)
  2. BBoth (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. (A) is false but (R) is true

Step-by-step solution

Assertion (A) is false because a solution of carbon disulfide and acetone exhibits a positive deviation from Raoult's law, not a negative deviation. Reason (R) is true. According to Raoult's law, positive deviation occurs when the new solute-solvent (A-B) interactions are weaker than the pure component (A-A and B-B) interactions. In the case of carbon disulfide and acetone, the dipolar interactions between the solute and solvent molecules are indeed weaker than the interactions in the pure liquids, which leads to t

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