JEE Main 2021ChemistrySome Basic Concepts of ChemistryEasyNumerical

JEE Main 2021 — Some Basic Concepts of Chemistry Question with Solution

JEE Main 2021 (18 Mar Shift 2)

Question

Consider the above reaction where 6.1 g of benzoic acid is used to get 7.8 g of m-bromo benzoic acid. The percentage yield of the product is ___ .

(Round off to the Nearest integer)

[Given : Atomic masses : C=12.0 u, H:1.0 u, O:16.0 u, Br=80.0 u]

Enter your answer

Show full solutionCorrect answer: 78
Correct answer
78

Step-by-step explanation

Moles of Benzoic acid =6.1122

= moles of m-bromobenzoic acid

So, weight of m-bromobenzoic acid

=6.1122×201 gm

=10.05 gm

% yield =Actual weightTheoretical weight×100

=7.810.05×100

=77.61%

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About this question

This is a previous-year question from JEE Main 2021, 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.