Two elements A and B form compounds of formula AB2 and AB4- When dissolved in 20-0g of benzene 1-0g of AB2 lowers freezing point by 2-3-C whereas 1-0g of AB4 lowers freezing point by 1-3-C- The Kf for benzene- The atomic masses of A and B are

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Standard XI

Chemistry

Depression in Freezing Point

Two elements ...

Question

Two elements A and B form compounds of formula AB₂ and AB₄. When dissolved in 20.0g of benzene 1.0g of AB₂lowers freezing point by 2.3^°C whereas 1.0g of AB₄ lowers freezing point by 1.3^°C. The K_f for benzene. The atomic masses of A and B are

27, 45

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42, 25

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52, 48

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48, 52

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Solution

The correct option is A 27, 45

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