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Question

# A certain mass of substance, when dissolved in 100 g C6H6, lowers the freezing point by 1.28∘C. The same mass of solute dissolved in 100 g water lowers the freezing point by 1.40∘C. If the substance has normal molecular weight in benzene and is completely ionized in water, into how many ions does it dissociate in water? Kf for H2O and C6H6O are 1.86 and 5.12 K kg mol−1.

A
2 ions
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B
3 ions
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C
4 ions
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D
5 ions
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Solution

## The correct option is C 3 ionsΔTf=iKfmFor benzene1.28=1×5.12×x100⇒x=25 molFor water 1.40=i×1.86×25100⇒i=3The substance dissociates into three ions in water. Hence, the correct option is B

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