Skip to main content

Among the statements (a)-(d) , the incorrect ones are: (a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments (b)…

JEE Main 2020 — Chemistry Inorganic Chemistry

2020mcqmedium

Among the statements (a)−(d)(a)-(d)(a)−(d) , the incorrect ones are:

(a)(a)(a) Octahedral Co(III)Co(III)Co(III) complexes with strong field ligands have very high magnetic moments

(b)(b)(b) When Δ0<P{\Delta }_{0}<PΔ0​<P , the d-electron configuration of Co(III)Co(III)Co(III) in an octahedral complex is teg4eg2{t}_{eg}^{4}{e}_{g}^{2}teg4​eg2​

(c)(c)(c) Wavelength of light absorbed by [Co(en)3]3+{[Co{(en)}_{3}]}^{3+}[Co(en)3​]3+ is lower than that of [CoF6]3−{[{CoF}_{6}]}^{3-}[CoF6​]3−

(d)(d)(d) If the Δ0{\Delta }_{0}Δ0​ for an octahedral complex of Co(III)Co(III)Co(III) is 18,000cm−118,000c{m}^{-1}18,000cm−1, the Δt{\Delta }_{t}Δt​ for its tetrahedral complex with the same ligand will be 16,000cm−116,000c{m}^{-1}16,000cm−1.

Official previous-year question

Held on 7 Jan 2020 · Verified 6 Jul 2026.

Options

  1. A

    (a)(a)(a) and (d)(d)(d) only

  2. B

    (c)(c)(c) and (d)(d)(d) only

  3. C

    (a)(a)(a) and (b)(b)(b) only

  4. D

    (b)(b)(b) and (c)(c)(c) only

Did you get this right?

Sign in to track your attempts and accuracy.

Your note

Sign in to keep a private note on this question. Nothing you write is ever public.

JEE Main Inorganic Chemistry in other years

Inorganic Chemistry 2026Inorganic Chemistry 2025Inorganic Chemistry 2024Inorganic Chemistry 2023Inorganic Chemistry 2022Inorganic Chemistry 2021Inorganic Chemistry 2019Inorganic Chemistry 2018Inorganic Chemistry 2017Inorganic Chemistry 2016Inorganic Chemistry 2015Inorganic Chemistry 2014

More JEE Main Inorganic Chemistry questions

$SF_4$ is isostructural with: A. $BrF_4^{\ominus}$ B. $CH_4$ C. $IF_4^{\oplus}$ D. $XeF_4$ E. $XeO_2 F_2$ Choose the correct answer from the options given below:

2026medium

Correct statements from the following are: A. Nitrogen in oxidation states from $+1$ to $+4$ disproportionates in acid medium. B. Nitrogen has the ability to form $d\pi - p\pi$ multiple bonds with itself and other elements with small size and high electronegativity. C. N-N single bond is stronger than P-P single bond. D. Nitrogen has highest density in its group due to small size. E. The maximum covalency of nitrogen is four since it has only four valence orbitals for bonding. Choose the correct answer from the options given below:

2026medium

The correct statements about metal carbonyls are A. The metal-carbon bonds in metal carbonyls possess both $\sigma$ and $\pi$-character. B. Due to synergic bonding interactions between metal and CO ligand, the metal-carbon bond becomes weak. C. The metal-carbon $\sigma$ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal. D. The metal-carbon $\pi$ bond is formed by the donation of electrons from filled d-orbital of metal into vacant $\pi^*$ orbital of CO. Choose the correct answer from the options given below:

2026medium

The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about $E^{3+}$ are A. It can act as a reducing agent. B. It can act as an oxidizing agent. C. $E^{3+}$ is more stable than $E^+$. D. The standard electrode potential value for $E^{3+}/E$ is positive. Choose the correct answer from the options given below:

2026hard

Among $Fe^{3+}$, $Pb^{2+}$, $Cu^{2+}$ and $Mn^{2+}$, identify the one that gets precipitated out while passing $H_2S$ in presence of $NH_4OH$ as group reagent. The highest possible oxidation state of the corresponding metal is

2026medium
View all Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

1826 questions

Organic Chemistry

1783 questions

Keep practicing Inorganic Chemistry

Work through every JEE Main Inorganic Chemistry PYQ, year by year.

Browse all Chemistry topics