JEE Main 2020 — Some Basic Concepts Of Chemistry Question with Solution
From: JEE Main 2020 (Online) 6th September Morning Slot
Question
A solution of two components containing
n1 moles of the 1st component and n2 moles of
the 2nd component is prepared. M1 and M2 are
the molecular weights of component 1 and 2
respectively. If d is the density of the solution
in g mL–1, C2 is the molarity and x2 is the mole
fraction of the 2nd component, then C2 can be
expressed as :
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
| 1st component | 2nd component | |
|---|---|---|
| Mole | n1 | n2 |
| Molecular Weight |
M1 | M2 |
| Mass | n1M1 | n2M2 |
Mass of solution = n1M1 + n2M2
density of the solution = d
C2 = Molarity of 2nd Component
x2 = Mole-fraction of 2nd Component
x2 =
1 - x2 =
Molarity of 2nd Component,
C2 =
n2
Volume of solution(ml)
1000
=
=
= (Dividing componendo and dividendo by n1 + n2)
=
=
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This is a previous-year question from JEE Main 2020, covering the Some Basic Concepts Of Chemistry 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.