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JEE Main 2026 · 4 Apr · Shift 1, Chemistry question 62

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

List-I: Complex ion

  • A
    [Cr(HX2O)X6]X2+\ce{[Cr(H2O)6]^{2+}}
  • B
    [Co(HX2O)X6]X2+\ce{[Co(H2O)6]^{2+}}
  • C
    [Cu(HX2O)X6]X2+\ce{[Cu(H2O)6]^{2+}}
  • D
    [Mn(HX2O)X6]X2+\ce{[Mn(H2O)6]^{2+}}

List-II: Calculated spin only magnetic moment (BM)

  • I
    3.87
  • II
    5.92
  • III
    4.90
  • IV
    1.73
Choose one option
Answer and worked solution

Official answer: D

Spin-only moments n(n+2)\sqrt{n(n+2)} (all aqua complexes are high spin):

Ion Config n μ (BM)
Cr²⁺ d⁴ 4 4.90 (III)
Co²⁺ d⁷ 3 3.87 (I)
Cu²⁺ d⁹ 1 1.73 (IV)
Mn²⁺ d⁵ 5 5.92 (II)

(D)

Topics:Magnetic properties and colour
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