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If the mass of a nonvolatil, nonelectrol...

If the mass of a nonvolatil, nonelectrolyte dissolved in a solvent is doubled but that of solvent is quadrupled, the elevation in boiling point of the solvent will be

A

unchanged

B

doubled

C

halved

D

quadrupled

Text Solution

Verified by Experts

The correct Answer is:
3
Because the concentration of solution is halved.
`DeltaT_(b)=(K_(b)xxW_(2)xx1000)/(M_(2)xxW_(1))`
`DeltaT_(b)^(')=(K_(b)xx(2W_(2))xx1000)/(M_(2)xx(4W_(1)))`
`=1/2((K_(b)xxW_(2)xx1000)/(M_(2)xxW_(1)))=1/2 DeltaT_(b)`
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