JEE Main 2002 — Some Basic Concepts Of Chemistry Question with Solution
From: AIEEE 2002
Question
In a compound C, H and N atoms are present in 9 : 1 : 3.5 by weight . Molecular weight of the compound is 108 g mol-1 . Molecular formula of compound is
Choose an option
Show full solutionCorrect option: C
Correct answer
CC6H8N2
Step-by-step explanation
| Element | Weight ratio | No of atoms of element | Simplest Ratio |
|---|---|---|---|
| C | 9 | 9/12 = 3/4 | 3 |
| H | 1 | 1/1 = 1 | 4 |
| N | 3.5 | 3.5/14 = 1/4 | 1 |
Empherical Formula of the compound (EF) will be C3H4N
Now to find molecular formula at first find number of moles of given mass
No. of moles (n) =
Given mass
Molar mass
2
No. of Moles is 2
Molecular formula (MF) = n (no. of moles) Empherical Formula (EF)
2 C3H4N
C6H8N2
Option (C) is correct
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This is a previous-year question from JEE Main 2002, 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.