Question

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

• A. (i), (ii), (iv)
• B. (i), (ii) only
• C. (i), (iii), (iv)
• D. (iv) only

Hint:

Minimum boiling azeotropes typically form between a solvent and a solute that exhibit strong intermolecular forces, leading to a constant boiling mixture.

Answer 1

The Correct Option is C

Azeotropes are mixtures of two or more liquids that boil at a constant temperature and cannot be separated by distillation. - Heptane and Octane (both hydrocarbons) do not form a minimum boiling azeotrope because they have similar boiling points.
- Water and Nitric acid form a minimum boiling azeotrope at 68.5°C.
- Ethanol and Water form a minimum boiling azeotrope at 78.2°C.
- Acetone and Carbon dioxide also form a minimum boiling azeotrope. Thus, the correct answer is (i), (iii), and (iv).