JEE Main 2025 — Solutions Question with Solution
JEE Main 2025 (2 Apr Shift 2)
Question
When 1 g each of compounds AB and 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 ____ (Nearest integer)
(Given : Molal boiling point elevation constant is
(Given : Molal boiling point elevation constant is
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Show full solutionCorrect answer: 25
Correct answer
25
Step-by-step explanation
For AB
Let molar mass of .
For
Let molar mass of
So
Now let a and b be atomic masses of A and B respectively, then
Let molar mass of .
For
Let molar mass of
So
Now let a and b be atomic masses of A and B respectively, then
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This is a previous-year question from JEE Main 2025, covering the Solutions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.