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Q.

Degree of ionization of 0.1 m NaCl is α1 . Degree of ionization of 0.1 m K2SO4  is α2. Both these solutions (in the same solvent) show the same freezing point when α1 : α2 is equal to

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answer is 4.

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Detailed Solution

ΔTf=i Kf m;Given ΔTf  is  same , kf  always is a constant ∴i1m1=i2m2 but m1=m2=0.1 m Thus    i1=i2 . . .(1) NaCln=2 : i1=1-α1+2α1=1+α1;....2 K2SO4n=3 : i2=1-α2+3α2=1+2α2.....3 substituting eq 2 and eq 3 in equation (1) 1 +α1=1+2α2 α1α2=2
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