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D
1.2M benzoic acid in a solution of benzene where the acid dimerizes to an extent of 50%
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Solution
The correct option is D1.2M benzoic acid in a solution of benzene where the acid dimerizes to an extent of 50% At particular temperature isotonic solutions are those which have same solute concentration.
For NaCl: ic=0.5×[1+(2−1)0.8]=0.9M
For sucrose solution: ic=153.9342×1000500×1=0.9M
For Na2SO4 solution: ic=0.3×3=0.9M
For NaOH:
Molality =1.840×1000100
For very dilute solutions molality is almost equal to the molarity. Thus
ic =1.840×10×2=0.9M
For benzoic acid: ic=1.2×[1+(0.5−1)0.5]=1.2×34=0.9M