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From the set of ions V⁴+, Ni²+, Ti³+, Co²+, Fe³+, Cu²+, how many are blue coloured in aqueous solution?

1. 2
2. 3
3. 1
4. 4

Correct answer: 2

Solution

Cu²+ (blue) and V⁴+ as VO²+ (blue) are the two blue species; the rest are green, pink, yellow or violet.

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