JEE Main 2022 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 26 July 2022, Shift 2, Chemistry Q61

Question 61 of 90 in this shift, Chemistry question 1 of 30, Section A.

Hemoglobin contains 0.34% of iron by mass. The number of Fe atoms in 3.3 g of hemoglobin is (Given: Atomic mass of Fe is 56 u,

\mathrm{N_A}

6.022 \times 10^{23}

\mathrm{mol^{-1}}

(1) $1.21 \times 10^{5}$
(2) $12.0 \times 10^{16}$
(3) $1.21 \times 10^{20}$ Official answer
(4) $3.4 \times 10^{22}$

Official answer

Option 3

NTA final key.

Chapter: Some Basic Concepts of Chemistry
Topic: Mole Concept
Idea tested: Mole and Avogadro Calculations

Same idea in other shifts

Asked 11× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.