Gce Model Questions Vol1 2017 Chemistry Question 8

Practice objective / multiple choice question 8 from the 2017 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Medium Difficulty
Question 8 GCE_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

The coordination complex \([\text{Ni(CN)}_{4}]^{2-}\) is square planar, shows a magnetic moment of 0 BM and exhibits an absorption maximum at \(500\ \text{nm}\). (a) Determine the oxidation state of Ni and its d‑electron count. (b) Estimate the crystal‑field splitting energy (Δ) in kJ mol\(^{-1}\) from the absorption data.

Answer Options

A. Ni oxidation state +2; d‑electron count 9; Δ ≈ 240 kJ mol⁻¹
B. Ni oxidation state +1; d‑electron count 9; Δ ≈ 210 kJ mol⁻¹
C. Ni oxidation state +3; d‑electron count 7; Δ ≈ 260 kJ mol⁻¹
Correct Answer D. Ni oxidation state +2; d‑electron count 8; Δ ≈ 240 kJ mol⁻¹
Correct Answer
D
Correct Option:
Ni oxidation state +2; d‑electron count 8; Δ ≈ 240 kJ mol⁻¹

About This Question

This is Gce Model Questions Vol1 2017 Chemistry Question 8. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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