Question

Of the ions Ti⁴⁺, Co²⁺ and Cr³⁺, ____________.

Options

• Ti⁴⁺ is colourless and Co²⁺ and Cr³⁺ are coloured______

• all three are coloured

• all three are colourless

• Co²⁺ is coloured and Ti⁴⁺ and Cr³⁺ are colourless

Answer 1

Of the ions Ti⁴⁺, Co²⁺ and Cr³⁺, Ti⁴⁺ is colourless and Co²⁺ and Cr³⁺ are coloured.

Explanation:

Due to the existence of three unpaired electrons in each, Co²⁺ and Cr³⁺ are coloured. However, because there are no unpaired electrons in Ti⁴⁺, it is colourless.