JEE Main 2020ChemistrySome Basic Concepts of ChemistryEasyMCQ

JEE Main 2020 — Some Basic Concepts of Chemistry Question with Solution

JEE Main 2020 (06 Sep Shift 2)

Question

The average molar mass of chlorine is 35.5 g mol-1. The ratio of Cl35 to Cl37 in naturally occurring chlorine is close to :

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Show full solutionCorrect option: B
Correct answer
B3 : 1

Step-by-step explanation

35CI37CIMolar ratiox1−x

Mavg.=35×x+371−x=35.5

35x+37−37x=35.5

2x=1.5

x=34

So, ratio of 35CI:37CI=3:1

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About this question

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.