JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 3 September 2020, Shift 2, Chemistry Q35

Question 35 of 75 in this shift, Chemistry question 10 of 25.

The incorrect statement is :

(1)Manganate and permanganate ions are tetrahedral
(2)Manganate and permanganate ions are paramagneticOfficial answer
(3)In manganate and permanganate ions, the $\pi$ -bonding takes place by overlap of p-orbitals of oxygen and d-orbitals of manganese
(4)Manganate ion is green in colour and permanganate ion is purple in colour

Official answer

Option 2

NTA final key (Sep 2020).

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Spin-only Magnetism

Same idea in other shifts

Asked 23× in all

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 2 · Q62Consider $|x|$ is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with $|x|$ …MediumOther
3 Apr 2025, Shift 1 · Q62The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are : A. $\mathrm{Cr^{2+}}$ B. $\mathrm{Fe^{2+}}$ C.…EasyOther
8 Apr 2025, Shift 2 · Q58The correct decreasing order of spin only magnetic moment values (BM) of $\mathrm{Cu^+}$ , $\mathrm{Cu^{2+}}$ , $\mathrm{Cr^{2+}}$ and…EasySingle correct
4 Apr 2024, Shift 2 · Q69A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic number of the metal isEasySingle correct
5 Apr 2024, Shift 1 · Q86The spin-only magnetic moment value of the ion among $\mathrm{Ti^{2+}}$ , $\mathrm{V^{2+}}$ , $\mathrm{Co^{3+}}$ and $\mathrm{Cr^{2+}}$ ,…MediumNumerical value
5 Apr 2024, Shift 1 · Q87In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour…HardNumerical valueHas a figure
6 Apr 2024, Shift 1 · Q86Among CrO, $\mathrm{Cr_2O_3}$ and $\mathrm{CrO_3}$ , the sum of spin-only magnetic moment values of basic and amphoteric oxides 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.