JEE Main 2022ChemistryBiomoleculesHardNumerical

JEE Main 2022 — Biomolecules Question with Solution

JEE Main 2022 (28 Jun Shift 2)

Question

2.5 g of protein containing only glycine C2H5NO2 is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5.03×10-3 bar. The total number of glycine units present in the protein is

(Given : R = 0.083 L bar K-1 mol-1 )

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Show full solutionCorrect answer: 330
Correct answer
330

Step-by-step explanation

π=CRT

5.03×10-3=2.5×1000M.wt×500×0.083×300

M.wt. =24.752 ×103gram=24752gram

Molar mass of glycine NH2CH2COOH=75 g/Mol.

No of glycine unit in protein =2475275 = 330.02 ≃ 330 units

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About this question

This is a previous-year question from JEE Main 2022, covering the Biomolecules 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.