Neco 2017 Chemistry Question 33

Practice objective / multiple choice question 33 from the 2017 Neco Chemistry examination.

Neco 2017 Chemistry Objective / Multiple Choice Medium Difficulty
Question 33 NECO • 2017 • CHEMISTRY • objective

The diagram shows the coordination complex \([Co(NH_3)_5Cl]^{2+}\) with its five ammonia ligands and one chloride ligand arranged around the central cobalt atom, and two chloride counter‑ions outside the coordination sphere. (a) Determine the oxidation state of the cobalt atom. (b) State the coordination number of the cobalt centre. (c) Identify the geometry of the complex. (d) Calculate the total number of valence electrons around the cobalt centre using the 18‑electron rule.

Answer Options

A. Oxidation state +3; coordination number 6; geometry octahedral; 16 valence electrons
Correct Answer B. Oxidation state +3; coordination number 6; geometry octahedral; 18 valence electrons
C. Oxidation state +2; coordination number 6; geometry octahedral; 18 valence electrons
D. Oxidation state +3; coordination number 5; geometry square pyramidal; 18 valence electrons
Correct Answer
B
Correct Option:
Oxidation state +3; coordination number 6; geometry octahedral; 18 valence electrons

About This Question

This is Neco 2017 Chemistry Question 33. It is one of the objective questions from the 2017 Neco Chemistry examination.

Difficulty level: Medium .

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