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JEE Main Chemistry question

ChemistrySolutionsJEE Main

The depression of freezing point of a 2% aqueous solution of a substance A is equal to the depression of freezing point of a 4% aqueous solution of substance B. If the molecular weight of B is 122.5 g , then the molecular weight of A is g . (Assume that both A and B are non-electrolytes.)

Answer: 60

Solution

Equal depression means equal molality, i.e. equal moles of solute per unit mass of solvent (water). Taking 100 g of each solution, the solvent masses

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Question ID VK-143465