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Q.

There is AB3 and sucrose solution with 0.1 M concentration each. If osmotic pressure of AB3 and sucrose solution is 0. 72 atm and 0.24 atm respectively at same temperature. The fraction of AB3 dissociated will be :

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a

0.25

b

0.50

c

0.67

d

0.90

answer is C.

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Detailed Solution

π1i1c1=π2i2c2⇒0.72i1×0.1=0.241×0.1 ⇒i1=3

AB3⟶A3++3B−

1−α   α       3α

1+3α=3  ⇒α=23 α=0.67

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