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(D) Colligative properties depend only on the number of solute particles in a solution,not on their chemical nature.$1$. Addition of non-volatile solu

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None of these

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(D) Colligative properties depend only on the number of solute particles in a solution,not on their chemical nature.$1$. Addition of non-volatile solutes to a solvent leads to a decrease in vapour pressure and an increase in boiling point (elevation of boiling point).$2$. In option $C$,the addition of non-volatile naphthalene to benzene decreases the vapour pressure of benzene,which is a colligative property.$3$. However,the second part of option $C$ (addition of toluene to benzene) involves two volatile liquids,which does not strictly follow the standard definition of colligative properties as they are typically defined for non-volatile solutes.$4$. Since options $A$ and $B$ involve volatile solutes (ethanol and nitric acid),they do not represent standard colligative effects.$5$. Therefore,none of the provided statements correctly describe a pure colligative effect based on standard definitions.

Which of the following statements concerning the properties of solutions describes a colligative effect?

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