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JEE Main 2017 Chemistry question

ChemistrySolutionsJEE Main 2017

g of was dissolved in g of . The change in freezing point was found to be C. If is ionised, the value of ( for water C kg mol) is approximately: (molar mass of S g mol and that of Na g mol)

Answer: (4)

Solution

First find the van't Hoff factor. dissociates into three ions, so with and degree of ionisation ,

i = 1 + (n-1)α = 1 + 2(0.815) = 2.63.

Next apply the depression formula :

3.82 = 2.63×1.86× m m =

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Question ID VK-115810