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COMEDK2022ChemistrySolutions

Which among the following forms minimum boiling azeotropes? (i) Heptane + Octane (ii) Water + Nitric acid (iii) Ethanol + Water (iv) Acetone + Carbon disulfide

Options

  1. A(i), (ii), (iv)
  2. B(i), (ii) only
  3. C(iii), (iv)
  4. D(iv) only

Correct answer

C. (iii), (iv)

Step-by-step solution

Minimum boiling azeotropes are formed by solutions showing large positive deviation from Raoult's law, where A-B interactions are weaker than A-A and B-B interactions. (i) Heptane + Octane: Both are similar non-polar alkanes, forming a nearly ideal solution. No azeotrope formed. (ii) Water + Nitric acid: Strong hydrogen bonding between unlike molecules causes large negative deviation from Raoult's law. Forms a maximum boiling azeotrope. (iii) Ethanol + Water: Mixing disrupts the extensive hydrogen bonding of pure w

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