Which of the following liquid pairs shows a positive deviation from Raoult’s law?

  • Option 1)

    Water ­ hydrochloric acid

  • Option 2)

    Benzene ­ methanol

  • Option 3)

    Water ­ nitric acid

  • Option 4)

    Acetone ­ chloroform.

 

Answers (1)

As we learnt in

Condition for positive deviation -

When A - A interactions and B - B  interactions  are  stronger than A - B interactions.

e.g. Ethanol + water

- wherein

\Delta H_{mix}> 0

\Delta V_{mix}> 0

(V_{f}>V_{A}+V_{B} )

\Delta H - Change\: in\: enthalpy

\Delta V - Change\: in\: volume

 

 When Benzene - Benzene interaction and Methanol - Methanol interaction are stronger than Benzene - Methanol interaction then solution shows positive deviation. 

Correct option is 2.

 


Option 1)

Water ­ hydrochloric acid

This is an incorrect option. 

Option 2)

Benzene ­ methanol

This is the correct option.

Option 3)

Water ­ nitric acid

This is an incorrect option. 

Option 4)

Acetone ­ chloroform.

This is an incorrect option. 

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