JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 30 July 2022, Shift 2, Chemistry Q50

Question 50 of 90 in this shift, Chemistry question 20 of 30, Section A.

In the ring test of

\mathrm{NO_3^-}

ion what is the oxidation number of iron in the complex (brown ring)

[\mathrm{Fe(H_2O)_5NO}]\mathrm{SO_4}

(1)+2
(2)+1Official answer
(3)+3
(4)+5

Official answer

Option 2

NTA final key.

Chapter: Coordination Compounds
Topic: Coordination Nomenclature
Idea tested: Oxidation State Calculation

Same idea in other shifts

Asked 7× in all

8 Apr 2024, Shift 1 · Q70An octahedral complex with the formula $\mathrm{CoCl_3\cdot nNH_3}$ upon reaction with excess of $\mathrm{AgNO_3}$ solution gives 2 moles…MediumSingle correct
29 Jul 2022, Shift 2 · Q86Sum of oxidation state (magnitude) and coordination number of cobalt in $\mathrm{Na[Co(bpy)Cl_4]}$ is ____. (Given: bpy = [figure:…EasyNumerical valueHas a figure
3 Aug 2021, Shift 2 · Q40The oxidation states of Fe in $\mathrm{[Fe(NCS)(NH_3)_5]SO_4}$ , $\mathrm{Na_3[Fe(S_2O_3)_3]}$ and $\mathrm{[Fe(CO)_5]}$ respectively areEasySingle correct
4 Aug 2021, Shift 1 · Q57Among the following species, the number of species with oxidation state of Fe in +3 is ________. A.…MediumNumerical valueHas a figure
4 Aug 2021, Shift 2 · Q38The oxidation states of Mn in $\mathrm{Mn_2(CO)_{10}}$ , $\left[\mathrm{Mn(CO)_5Br}\right]$ and $\mathrm{K}\left[\mathrm{Mn(CN)_6}\right]$ …EasySingle correct
2 Sep 2020, Shift 1 · Q49The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are $x$ , $y$ and $z$ . The sum of $x$ , $y$ and $z$ is…MediumNumerical 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.