Chemistry 5070 · O Level · Identification of ions and gases

Identification of ions and gases — practice question

Acidified aqueous potassium manganate(VII) is used as the test reagent. If it is added to an aqueous solution of compound M, the test reagent changes colour from .....1..... . This colour change indicates that M is .....2..... . Which words correctly complete gaps 1 and 2?

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