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Assertion: Non-ideal solutions showing negative deviation from Raoult's law have stronger intermolecular forces between unlike molecules.
Reasoning: When two different substances are mixed, they may experience either positive or negative deviations from Raoult's law. In the case of negative deviation, the vapour pressure of the solution is lower than predicted by Raoult's law. This happens because the intermolecular forces between unlike molecules are stronger than those between like molecules. As a result, the attractive forces between the molecules in the solution are stronger, causing them to stick together more tightly and making it harder for them to escape into the vapour phase. Therefore, the assertion is true, and the reasoning provides a logical explanation for it.
Non-ideal solutions showing negative deviation from Raoult's law have weaker intermolecular forces between unlike molecules.
Non-ideal solutions showing negative deviation from Raoult's law have no intermolecular forces between unlike molecules.
Non-ideal solutions showing negative deviation from Raoult's law have stronger intermolecular forces between like molecules.
Non-ideal solutions showing negative deviation from Raoult's law have weaker intermolecular forces between like molecules.
Answers (1)
Option A is incorrect because non-ideal solutions showing negative deviation from Raoult's law have stronger intermolecular forces between unlike molecules, as explained in the reasoning. Option B is incorrect because all substances have intermolecular forces, and these forces play a crucial role in determining the properties of the solutions they form. Option C is incorrect because in the case of negative deviation, the intermolecular forces between like molecules are weaker than those between unlike molecules. Option D is also incorrect because the strength of intermolecular forces between like molecules is not relevant to the negative deviation from Raoult's law.
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