Q.

0.004 M solution of Na2SO4 is isotonic with 0.01M solution of glucose at same temperature. The approximate degree of dissociation of Na2SO4  is

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a

50%

b

25%

c

75%

d

85%

answer is C.

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Detailed Solution

.πsodium sulphate  ​​=   πGlucose

  0.01RT    =    i×0.004RT

Na2​SO4​−−−−−>2Na++SO-24

   1−α                           α

i=1+2α=2.5

α=0.75

 or 75% dissociation

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