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JEE Main 2026 Jan 23 Shift 1, Chemistry Q9: Colour, Magnetism And Stability Of Co-ordination Compounds

JEE Main2026Jan 23, Shift 1Chemistry
Q.

Given below are two statements :

Statement I : [CoBr] ion will absorb light of lower energy than [CoCl] ion.

Statement II : In [CoI] ion, the energy separation between the two set of d-orbitals is more than [CoCl] ion.

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

  1. A

    Both Statement I and Statement II are false

  2. B

    Statement I is true but Statement II is false

  3. C

    Statement I is false but Statement II is true

  4. D

    Both Statement I and Statement II are true

Solution

The spectrochemical series gives ligand field strength: I Br Cl.

Statement I: Weaker-field Br gives a smaller than Cl, so [CoBr] absorbs photons of lower energy (longer wavelength). True.

Statement II: I is even weaker than Cl, so [CoI] has a smaller d-orbital splitting than [CoCl], not larger. False.

Concept behind this question

Colour, Magnetism And Stability Of Co-ordination CompoundsNotes, formulas and examples →

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