JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
When 1 g each of compounds AB and \(\mathrm{AB}_2\) are dissolved in 15 g of water separately, they increased the boiling point of water by 2.7 K and 1.5 K respectively. The atomic mass of A (in amu) is ____ \(\times 10^{-1}\) (Nearest integer)
(Given : Molal boiling point elevation constant is \(\left.0.5 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)\)
- A 20
- B 30
- C 35
- D 25
Answer & Solution
Correct Answer
(D) 25
Step-by-step Solution
Detailed explanation
For AB \(\begin{aligned} & \Delta \mathrm{T}_{\mathrm{b}}=2.7 \mathrm{~K} \\ & 2.7=1 \times 0.5 \times \mathrm{m} \\ & \mathrm{~m}=\frac{27}{5} \end{aligned}\) Let molar mass of \(\mathrm{AB}=\mathrm{x}\).…
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