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JEE Main Chemistry question

ChemistrySolutionsJEE Main

The vapour pressure of a solution of a non-volatile electrolyte (A) in a solvent (B) is 95% of the vapour pressure of the solvent at the same temperature. If , where and are molecular weights of B and A respectively, the weight ratio of the solvent and solute are:

Answer: (B)

Solution

Relative lowering , giving (dilute approximation refined gives

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Question ID VK-143332