17.7—Aqueous solutions of transition metal ions are usually coloured

Know that aqueous solutions of transition metal ions are usually coloured.

Use —aqueous solutions of transition metal ions are usually coloured to connect the rule to the data and decision in the question.

This matters because —aqueous solutions of transition metal ions are usually coloured determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —aqueous solutions of transition metal ions are usually coloured to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —Aqueous solutions of transition metal ions are usually coloured is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.