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20 gm of a binary electrolyte (mol. mass...

20 gm of a binary electrolyte (mol. mass = 100 g/mole) is dissolved in 500g of water. The freezing point of the solution is `-0.74^(@)C` if `K_(f)(H_(2)O) = 1.86` K `"molality"^(-1)`. Then the degree of ionization of the electrolyte is:

A

0.5

B

0.75

C

`00%`

D

`0`

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta T_f =ixxX_fxxm rArr 74 =(1+alpha)xx(20//100)/(500//1000) rArr 1+alpha=1 rArr alpha=0`
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