JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 29 June 2022, Shift 1, Chemistry Q86

Question 86 of 90 in this shift, Chemistry question 26 of 30, Section B.

The number of terminal oxygen atoms present in the product B obtained from the following reaction is ____________.

\mathrm{FeCr_2O_4 + Na_2CO_3 + O_2 \rightarrow A + Fe_2O_3 + CO_2}

\mathrm{A + H^+ \rightarrow B + H_2O + Na^+}

Official answer

NTA final key (2022 Session 1).

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Preparation Steps of Potassium Dichromate

Same topic in other shifts

All d-Block Elements questions

2 Apr 2026, Shift 2 · Q60Given below are two statements: Statement I: Among Zn, Mn, Sc and Cu, the energy required to remove the third valence electron is highest…MediumSingle correct
2 Apr 2026, Shift 2 · Q74Number of paramagnetic ions among the following d- and f-block metal ions is __________.…MediumNumerical value
4 Apr 2026, Shift 1 · Q61Correct statements from the following are A. Potassium dichromate is an oxidising agent and it oxidises $\mathrm{FeSO_4}$ to…MediumOther
4 Apr 2026, Shift 2 · Q62Consider $|x|$ is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with $|x|$ …MediumOther
5 Apr 2026, Shift 1 · Q60Which of the following is NOT a physical or chemical characteristics of interstitial compounds?EasySingle correct
5 Apr 2026, Shift 2 · Q60Given below are two statements : Statement I : Presence of large number of unpaired electrons in transition metal atoms results in higher…MediumTwo statements

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 42 of the 174 JEE Main shifts held from 2017 to 2026.