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JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
A molecule \(M\) associates in a given solvent according to the equation \(M\, \rightleftharpoons \,{(M)_n}\) For a certain concentration of \(M,\) the van't Hoff factor was found to be \(0 .9\) and the fraction of associated molecules was \(0.2.\) The value of \(n\) is
- A \(3\)
- B \(5\)
- C \(2\)
- D \(4\)
Answer & Solution
Correct Answer
(C) \(2\)
Step-by-step Solution
Detailed explanation
van't Hoff factor \((i)\) and the degree of association are related as below : \(i\, = \,1\, - \,\alpha \,\left( {1 - \,\frac{1}{n}} \right)\) \(0.9\, = \,1 - \,0.2\,\left( {1 - \frac{1}{n}} \right)\) On solving, \(\,\left( {1 - \frac{1}{n}} \right)\, = \,\frac{1}{2}\)…
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