JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
The observed osmotic pressure for a \(0.10\, M\) solution of \(Fe(NH_4)_2(SO_4)_2\) at \(25\,^oC\) is \(10.8\, atm\). The expected and experimental ( observed) values of van't Hoff factor \((i)\) will be respectively: \((R\,= 0.082\, L\, atm\, k^{-1}\, mol^{-1})\)
- A \(5\) and \(4.42\)
- B \(4\) and \(4.00\)
- C \(5\) and \(3.42\)
- D \(3\) and \(5.42\)
Answer & Solution
Correct Answer
(A) \(5\) and \(4.42\)
Step-by-step Solution
Detailed explanation
Given \({\pi _{ob}}\, = \,10.8\,atm\) \({\pi _{nor}}\, = \,CST\, = \,0.10\, \times \,0.0821\, \times \,298\, = \,2.446\) now experimntal value of \((i)\) \(=\,\frac {Observed\,osmotic\,pressure}{Normal\,osmotic\,pressure}\) \(=\,\frac {10.8}{2.446}\,=\,4.42\)
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