Question

The Crystal Field Stabilisation Energy (CFSE) for [CoCl₆]⁴⁻ is 18000 cm⁻¹. The CFSE for [CoCl₄]²⁻ will be ______.

Options

• 8000 cm⁻¹

• 6000 cm⁻¹

• 16000 cm⁻¹

• 18000 cm⁻¹

Answer 1

The Crystal Field Stabilisation Energy (CFSE) for [CoCl₆]⁴⁻ is 18000 cm⁻¹. The CFSE for [CoCl₄]²⁻ will be `bbunderline(8000  cm^(−1))`.

Explanation:

The relationship between the crystal field splitting energy for a tetrahedral complex (Δ_t) and an octahedral complex (Δ_o) is given by the formula:

`Δ_t = 4/9 Δ_o`

Substitute the given Δ_o value into the formula.

`Δ_t = 4/9 xx 18000  cm^(-1)`

Δ_t = 4 × 2000 cm⁻¹

Δ_t = 8000 cm⁻¹