JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumConceptual

JEE Main 30 June 2022, Shift 1, Chemistry Q86

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

In the following brown complex, the oxidation state of iron is +___________.

[\mathrm{Fe(H_2O)_6}]^{2+}+\mathrm{NO}\rightarrow[\mathrm{Fe(H_2O)_5(NO)}]^{2+}+\mathrm{H_2O}

Brown complex

Official answer

NTA final key.

Chapter: Coordination Compounds
Topic: Group 15 & 16
Idea tested: Brown Ring Test for Nitrates

Same topic in other shifts

All Group 15 & 16 questions

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2 Apr 2025, Shift 2 · Q59The nature of oxide ( $\mathrm{TeO_2}$ ) and hydride ( $\mathrm{TeH_2}$ ) formed by Te, respectively are :MediumSingle correct
3 Apr 2025, Shift 1 · Q61Given below are two statements: Statement I : The N - N single bond is weaker and longer than that of P - P single bond. Statement II :…MediumTwo statements
9 Apr 2024, Shift 2 · Q89Number of oxygen atoms present in chemical formula of fuming sulphuric acid is ________.EasyNumerical value

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.