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JEE Main 2026 · 2 Apr · Shift 1, Chemistry question 62

Match List - I with List - II.

Choose the correct answer from the options given below :

List - I: Chromium (III) Complexes (en = ethylene diamine)

  • A
    [Cr(CN)X6]X3−\ce{[Cr(CN)6]^{3-}}
  • B
    [CrFX6]X3−\ce{[CrF6]^{3-}}
  • C
    [Cr(HX2O)X6]X3+\ce{[Cr(H2O)6]^{3+}}
  • D
    [Cr(en)X3]X3+\ce{[Cr(en)3]^{3+}}

List - II: $\Delta_0$ (cm$^{-1}$)

  • I
    15,060
  • II
    17,400
  • III
    22,300
  • IV
    26,600
Choose one option
Answer and worked solution

Official answer: D

Spectrochemical series. FX−<HX2O<en<CNX−\ce{F-}<\ce{H2O}<\text{en}<\ce{CN-}, so for Cr(III) Δo\Delta_o increases in that order:

Complex Δo\Delta_o (cm⁻¹)
[CrFX6]X3−\ce{[CrF6]^{3-}} 15,060 (I)
[Cr(HX2O)X6]X3+\ce{[Cr(H2O)6]^{3+}} 17,400 (II)
[Cr(en)X3]X3+\ce{[Cr(en)3]^{3+}} 22,300 (III)
[Cr(CN)X6]X3−\ce{[Cr(CN)6]^{3-}} 26,600 (IV)

Match: A-IV, B-I, C-II, D-III.

(D)

Topics:Crystal field theory
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