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Chemistry · Coordination Compounds

JEE Main 2026 — 23 January, Morning Shift — Question 56

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II :

Statement I: [CoBr4]2−\left[\mathrm{CoBr}_{4}\right]^{2-} ion will absorb light of lower energy than [CoCl4]2−\left[\mathrm{CoCl}_{4}\right]^{2-} ion.

Statement II: In [CoI4]2−\left[\mathrm{CoI}_{4}\right]^{2-} ion, the energy separation between the two set of d-orbitals is more than [CoCl4]2−\left[\mathrm{CoCl}_{4}\right]^{2-} ion.

In the light of the above statements, choose the correct answer from the options given below :

  1. Option A:

    Both Statement I and Statement II are false

  2. Option B:

    Statement I is true but Statement II is false

    Correct
  3. Option C:

    Statement I is false but Statement II is true

  4. Option D:

    Both Statement I and Statement II are true

Answer: B

Step-by-step solution

Statement 1 (True) Strength of ligand : Cl−>Br−\mathrm{Cl}^{-}>\mathrm{Br}^{-} Δt:[CoCl4]2−>[CoBr4]2−\Delta_{\mathrm{t}}:\left[\mathrm{CoCl}_{4}\right]^{2-}>\left[\mathrm{CoBr}_{4}\right]^{2-} Eabsorbed :[CoCl4]2−>[CoBr4]2−\mathrm{E}_{\text {absorbed }}:\left[\mathrm{CoCl}_{4}\right]^{2-}>\left[\mathrm{CoBr}_{4}\right]^{2-} Statement 2 (False) Strength of ligand : I−<Cl−\mathrm{I}^{-}<\mathrm{Cl}^{-} Δt:[CoI4]2−<[CoCl4]2−\Delta_{t}:\left[\mathrm{CoI}_{4}\right]^{2-}<\left[\mathrm{CoCl}_{4}\right]^{2-}

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
23 January, Morning Shift
Subject
Chemistry
Chapter
Coordination Compounds
Topic
Theories of Bonding in Coordination Compounds

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