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How is the vapour pressure of a solvent ...

How is the vapour pressure of a solvent afffected when anon volatile solute is dissolved in it?

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The vapour presure of the solvent decreases on adding a non-volatile solute to it. It is because some of the solvent molecule at the surface of the solvent are replaced by non volatile solute particles.
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ICSE-SOLUTIONS-EXERCISE (PART-II Descriptive Questions) (VERY SHORT ANSWER QUESTIONS)
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  7. Write expressions for the Raoult's law for non-volatile solutes.

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  8. Define an ideal solution and write one of its characteristics.

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  9. State any two characteristics of ideal solutions.

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  10. What type of liquids form ideal solutions?

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