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1 g of a monobasic acid dissolved in 200 g of water lowers the freezing point by `0.186^@ C`.On the other hand when 1 g of the same acid is dissolved in water so as to make the solution 200 mL , this solution requires 125 mL of 0.1 N NaOH for complete neutralization. If `alpha` for the acid is `x xx10`. Find x: |
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Answer» Correct Answer - 60 Let molar mass of acid be m. then 0.186=`ixx1/mxx1000/200xx1.86` Also, `1/m=125xx0.1xx10^(-3) so m=10000/125=400/5=80` so `i=80/50=8/5=1.6=1+ alpha implies alpha=60%` |
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