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A 0.004 M solution of sodium sulphate is...

A 0.004 M solution of sodium sulphate is isotonic with .010 M solution of glucose. The apparent percentage dissociation sodium sulphate is

A

`25%`

B

`50%`

C

`75%`

D

`85%`

Text Solution

Verified by Experts

The correct Answer is:
C
Hint : `pi_("sod. sulphate")=pi_("glucose")`
`underset(1-alpha)(Na_2SO_4)rarrunderset(2alpha)(2Na^(+))+underset(alpha)(SO_4^(2-))`
`i=1+2alpha=2.5`
`alpha = 0.75 ` or 75% dissociation
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  • In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01M MgCl_2 solution is :

    A
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    B
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    C
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    C
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