If the vapour pressure of solutions of two liquids are less than those expected from ideal solutions they are said to have

negative deviations from ideal behaviour

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positive deviations from ideal behaviour

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ideal behaviour

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positive deviations for lower concentration and negative deviations for higher concentration.

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Solution

The correct option is A negative deviations from ideal behaviour
Explanation:

The A-B interaction is greater than the A-A- and B-B interactions and thus the liquids tend to be mixed rather than existing individually. So the mixture of liquids A-B does not vapourise and tend to be in the solution state itself.

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