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Non-Ideal Solutions

If observed v...

Question

If observed vapour pressure is greater than ideal vapour pressure then:

A

it is known as negative deviation from Raoult's law

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B

it is known as ideal solution

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C

it is known as positive deviation from Raoult's law

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D

None of these

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Solution

The correct option is A it is known as positive deviation from Raoult's law
If observed vapour pressure is greater than ideal vapour pressure- positive deviation.
If observed vapour pressure is smaller than the ideal vapour pressure-negative deviation.
If observed vapour pressure is same as ideal solution- ideal solution.
Correct option for above is positive deviation

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Q. CASE1: Read the passage given below and answer the following question.

The solution which obeys Raoult’s law over the entire range of concentration are known as ideal solutions. The solution which does not obey Raoults law over the entire range of concentration, then it is called non-ideal solution. The vapour pressure of such as a solution is either higher or lower than that predicted by Raoult’s law. If it is higher, the solution exhibits positive deviation and if it is lower, it exhibits negative deviation from Raoult’s law.
Some liquids on mixing, form azeotropes which are binary mixture having the same composition in liquid and vapour phase. There are two types of azeotropes. Minimum boiling azeotropes and maximum boiling azeotropes.

Which of the following solutions show negative deviation from Raoult’s law?
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Q. CASE 1: Read the passage given below and answer the following question

The solution which obeys Raoult’s law over the entire range of concentration are known as ideal solutions. The solution which does not obey Raoults law over the entire range of concentration, then it is called non-ideal solution. The vapour pressure of such as a solution is either higher or lower than that predicted by Raoult’s law. If it is higher, the solution exhibits positive deviation and if it is lower, it exhibits negative deviation from Raoult’s law.
Some liquids on mixing, form azeotropes which are binary mixture having the same composition in liquid and vapour phase. There are two types of azeotropes. Minimum boiling azeotropes and maximum boiling azeotropes.

Correct statement(s) about azeotropes is/are:
[0.77 Mark]

Q. The vapour pressure of a solution of the liquids A

(P^{0} = 80 m m o f H g a n d X_{A} = 0.4)

(P^{0} = 120 m m o f H g a n d X_{B} = 0.6)

is observed to be 100 mm of Hg. It shows that the solution exhibits:

Q. A solution of

C H C l_{3} + C H_{3} C O C H_{3}

shows negative deviation from Raoults law.

Q. When a solution of

C H {C l}_{3}

and acetone is formed, the solution is non-ideal with _______ deviation from Raoult's law.The vapour pressure of such a solution will be _______ than the corresponding ideal solution.

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