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Highly selective Backlog Qs for JEE MainChemistryStructure of Atom

Match the metal ions given in Column 'I' with the spin magnetic moments of the ions given in Column 'II'. Column I Column II a. Co 3 + i. 8 B . M . b. Cr 3 + ii. 35 B . M . c. Fe 3 + iii. 3 B . M . d. Ni 2 + iv. 24 B . M . v. 15 B . M

Options

  1. Aa b c i v i i i d i i i
  2. Ba b c i i i v i d i i
  3. Ca b c i i i i i i d i v
  4. Da b c i v v i i d i

Correct answer

D. a b c i v v i i d i

Step-by-step solution

Magnetic moment μ = n n + 2 B . M . (i) Co 3 + → 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 0 3 d 6 n = 4 μ = 4 4 + 2 = 24 B . M . (ii) Cr + 3 → 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 0 3 d 3 n = 3 μ = 3 3 + 2 = 15 B . M . (iii) Fe 3 + → 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 0 3 d 5 n = 5 μ = 5 5 + 2 = 35 B . M . (iv) Ni + 2 → 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 0 3 d 8 n = 2 μ = 2 2 + 2 = 8 B . M .

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