Q21 / 97 · NTA Abhyas (JEE Main) 2020 · Chemistry · Solutions

Assertion: Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components.

Reason: The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixutre.

  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • D
    If assertion is false but reason is true.

Solution

Non-ideal solutions with positive deviation i.e., having more vapour pressure than expected, boil at lower temperature while those with negative deviation boil at higher temperature than those of the components.

Hence, the correct answer is option: 'B'.

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