JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
Sea water contains \(29.25 \%\) \(NaCl\) and \(19 \% \,MgCl _2\) by weight of solution. The normal boiling point of the sea water is \(..........{ }^{\circ} C\) (Nearest integer) Assume \(100 \%\) ionization for both \(NaCl\) and \(MgCl _2\) Given : \(K _{ b }\left( H _2 O \right)=0.52\,K\,kg\,mol ^{-1}\) Molar mass of \(NaCl\) and \(MgCl _2\) is 58.5 and \(95\,g\) \(mol ^{-1}\) respectively.
- A \(115\)
- B \(114\)
- C \(113\)
- D \(116\)
Answer & Solution
Correct Answer
(D) \(116\)
Step-by-step Solution
Detailed explanation
\(\text { Amount of solvent }=100-(29.25+19)=51.75\,g\) \(\Delta T _{ b }=\left[\frac{2 \times 29.25 \times 1000}{58.5 \times 51.75}+\frac{3 \times 19 \times 1000}{95 \times 51.75}\right] \times 0.52\) \(\Delta Tb =16.075\)…
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