WAEC Chemistry 2015 Objective — Question 9

Question 9 of 50 from the West African Examinations Council (WAEC) Chemistry 2015 Objective paper, with the correct answer and a full explanation.

The following transition metal ions would be coloured in aqueous solution except

A. Cr³⁺
B. Fe³⁺
C. Mn³⁺
D. Sc³⁺Correct

Explanation

Sc³⁺ has no d-electrons (fully empty d-orbital), so it is colourless, unlike Cr³⁺, Fe³⁺, and Mn³⁺ which have partially filled d-orbitals and are coloured.

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