CUET · CHEMISTRY · PYQ PAPER 2024
A molecule X associates in a given solvent as per the following equation: \(X \rightleftharpoons(X) n\). For a given concentration of \(X\), the van't Hoff factor was found to be \(0 . 8 0\), and the fraction of associated molecules was \(0 . 3\). The correct value of ' \(n\) ' is:
- A 2
- B 3
- C 1
- D 5
Answer & Solution
Correct Answer
(B) 3
Step-by-step Solution
Detailed explanation
\( i = 1 - \alpha + \frac{\alpha}{n} \) \( 0.80 = 1 - 0.3 + \frac{0.3}{n} \) \( 0.80 - 0.7 = \frac{0.3}{n} \) \( 0.1 = \frac{0.3}{n} \) \( n = \frac{0.3}{0.1} = 3 \)
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