JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
Lead storage battery contains \(38\,\%\) by weight solution of \(H _2 SO _4\). The van't Hoff factor is \(2.67\) at this concentration. The temperature in Kelvin at which the solution in the battery will freeze is \(..........\) (Nearest integer).Given \(K _{ f }=1.8\,K\, kg\, mol^{-1}\)
- A \(241\)
- B \(242\)
- C \(256\)
- D \(243\)
Answer & Solution
Correct Answer
(D) \(243\)
Step-by-step Solution
Detailed explanation
\(\Delta T _{ f }= i \cdot K _{ f } \cdot m\) \(\Rightarrow \Delta T _{ f }=2.67 \times 1.8 \times \frac{38}{98} \times \frac{1000}{62}\) \(\Rightarrow \Delta T _{ f }=30.05\) \(\therefore \text { F.P. }=243\,K\)
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