Equimolal solutions in the same solvent have

  • Option 1)

    same boiling point but different freezing point

  • Option 2)

    same freezing point but different boiling point

  • Option 3)

    same boiling and same freezing points

  • Option 4)

    different boiling and different freezing points

 

Answers (1)

As we learnt in

Rault's Law -

The total vapour pressure of binary mixture of miscible liquids be having ideally is given by

P_{T}= P_{A}^{0}x_{A}+P_{B}^{0}x_{B}

Where x_{A}  and  x_{B} are mole fraction of A and B in liquid phase.

 

 

- wherein

P_{A}^{0}  and P_{B}^{0} are vapour pressures of pure liquids.

 

 According to Raoult's law equimolar solutions of all substance in the same solvent will show equal value of colligative properties such as elevation in Boiling Point, depression in freezing point, osmotic pressure and relative lowering of vapour pressure. 

Correct option is 3.


Option 1)

same boiling point but different freezing point

This is an incorrect option.

Option 2)

same freezing point but different boiling point

This is an incorrect option.

Option 3)

same boiling and same freezing points

This is the correct option.

Option 4)

different boiling and different freezing points

This is an incorrect option.

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