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ChemistryLiquid SolutionMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasysingle choice

What is the freezing point of a solution containing 8.1 g HBr in 100 g water, assuming that the acid to be 90% ionized $[K_{f} (H_{2} O)] = 1.86 Kkgmo l^{- 1}$ .

Options:

Answer:

Solution:

$HBr \to H^{+} + {Br}^{-}$

$i = 1 - α +n x$

$n = 2$

$i = 1 + α$

${ΔΤ}_{g} = i kg \times m$

${ΔΤ}_{g} = (1 - α) 1 .86 \times \frac{8 .1}{81} \times \frac{1000}{100}$

${ΔΤ}_{g} = (1 + 9) \times 1 .86 \times \frac{8 .1}{81} \times 10$

${ΔΤ}_{g} = 3 .56$

$T_{g}^{o} = 0 ° C$

${ΔΤ}_{g} = T_{g}^{o} - T_{g}$

$T_{g} = - 3 .534 ° C$

Stream:NTA_ABHYASSubject:ChemistryTopic:Liquid SolutionSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2020

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