JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
When a certain amount of solid \(A\) is dissolved in \(100\,g\) of water at \(25^{\circ}\,C\) to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressure of pure water is \(23.76\,mm\,Hg\). The number of moles of solute \(A\) added is \(...........\) (Nearest Integer)
- A \(2\)
- B \(3\) or \(6\)
- C \(4\)
- D \(5\)
Answer & Solution
Correct Answer
(B) \(3\) or \(6\)
Step-by-step Solution
Detailed explanation
\(\because\) Diliute solution given: \(\frac{ P ^{0}- P _{ s }}{ P ^{0}} \sim \frac{{ }^{n} \text { solute }}{{ }^{n} \text { solvent }}\) \(\frac{ P ^{0}- P ^{0} / 2}{ P ^{0}}=\frac{{ }^{n} \text { solute }}{ n _{\text {solvent }}}\) " solute…
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