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Ratio of DeltaT(b)//K(b) for 6% AB(2) "a...

Ratio of `DeltaT_(b)//K_(b)` for `6% AB_(2) "and" 9% A_(2)B (AB_(2) "and" A_(2)B` both are non-electrolytes ) is 1 mol/kg in both cases. Hence , atomic masses of A and B are respectively :

A

`60,90`

B

`40,40`

C

`40,10`

D

`10,40`

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaT=(1000K_(b)w_(1))/(m_(1)w_(2))and(DeltaT)/(K_(b))(AB_(2))=(1000xx6)/(m_(1)xx100)=1`
`:.m_(1)(AB_(2))=60=A+2Band(DeltaT)/(K_(b))(A_(2)B)=(1000xx9)/(m_(1)xx100)=1`
`:.m_(1)(A_(2)B)=90=2A+BrArrA=40,B=10`
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Figure explains elevation in boiling point when a non-volatile solute is added to a solvent. Variation of vapour pressure with temperaure and elevation in boiling point is marked. Ratio of DeltaT_(b)//K_(b) of 6% AB_(2) and 9% A_(2)B (AB_(2) and A_(2)B both are non-electrolytes) is 1 mol/kg in both cases. Hence, atomic masses of A and B are respectively.

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

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  13. Which of the following is not a colligative property ?

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  15. The highest osmotic pressure corresponds to the which of the following...

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  16. The correct order of increasing boiling points of the following aqueou...

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  17. To observe an elevation of boiling point of 0.05^(@)C, the amount of a...

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  18. Which of the following aqueous solutions has the highest freezing poin...

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