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20g of a binary electrolyte(mol.wt.=100)...

`20`g of a binary electrolyte(mol.wt.=`100`)are dissolved in `500`g of water.The freezing point of the solution is `-0.74^(@)CK_(f)=1.86K "molality"^(-1)`.the degree of ionization of the electrolyte is

A

0.5

B

0.75

C

1

D

zero

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