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KBr is 180% dissociated in aqueous solut...

KBr is `180%` dissociated in aqueous solution of `0.5m` concentration. (Given,`K_(f)"for water "=1.86Kkg" mol"^(-1)` ). The solution freezes at

A

`271.326K`

B

272 K

C

`270.5K`

D

`268.5K`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaT_(f)=ixxK_(f)xx "molality"`
Here,degree of dissociation `=80%`
`becausei=(1-alpha+nalpha)/(1)`
`KBrhArrK^(+)+Br^(-)`
`i=(1-0.8+2xx0.8)/(1)=1.8`
`:.DeltaT_(f)=1.8xx1.86xx0.5=1.674K`
`DeltaT_(f)^(@)-T_(f)rArr1.678=273-T_(f)`
`T_(f)=271.326K`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-SOLUTIONS AND COLLIGATIVE PROPERTIES -Exercise 1 (Types of Solutions and Concentration of Solutions)
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  2. The relative lowering of vapour pressure of an aqueous solution contai...

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  3. KBr is 180% dissociated in aqueous solution of 0.5m concentration. (...

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  5. Benzoic acid is dissolved in benzene, van't Hoff factor will be

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  8. Match the laws given in Column I with expressions given in Column II. ...

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  9. Lowering of vapour pressure is highest for

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  10. If the elevation in boiling point of a solution of 10 g of solute (mol...

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  11. The vapour pressure of water at 20^(@)C is 17.54mm. When 20g of non - ...

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  12. The osmotic pressure of a 5% (weight// volume) solution of cane sugar...

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  13. The freezing point of 0.1 M solution of glucose is -1.86^(@)C. If an e...

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  14. At 10^(@)C, the osmotic pressure of urea solution is 500 mm.The soluti...

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  15. An aqueous solution freezes at -0.186^(@)C (K(f)=1.86^(@) ,K(b)=0.512^...

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  16. Colligative properties of a solution depends upon

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  17. In coparison to a 0.01 M solution of glucose, the depression in freezi...

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  18. Which of the following aqueous solution should have the highest boilin...

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  19. In which case van't Hoff factor is maximum ?

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  20. Ratio of DeltaT(b)//K(b) for 6% AB(2) "and" 9% A(2)B (AB(2) "and" A(2)...

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