Question

Consider the following complex:

[Co(NH₃)₅CO₃]ClO₄

The coordination number, oxidation number, number of d-electrons and number of unpaired d-electrons on the metal respectively are:

पर्याय

• 6, 3, 6, 0

• 7, 2, 7, 1

• 7, 1, 6, 4

• 6, 2, 7, 3

Answer 1

6, 3, 6, 0

Explanation:

• Coordination number: The complex [Co(NH₃)₅CO₃] has a coordination number of 6 (five NH₃ and one \[\ce{CO^{2-}_3}\]), indicating an octahedral geometry.
• Oxidation number: x + 0 − 2 = +1
  x = +1 + 2 
  x = +3
• d-electrons: Co (Z = 27) → Co³⁺ = d⁶
• Unpaired electrons: Low-spin d⁶ (strong field ligands) → 0