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'0.004 M' solution of 'Na2 SO4' is isoto...

'0.004 M' solution of 'Na_2 SO_4' is isotonic with '0.01 M' solution of glucose at, same temperature. The apparent degree of dissociation of 'Na_2 SO_4' is

A

0.25

B

0.5

C

0.75

D

0.85

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