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An aqueous solution of CuCrO4 appears green. This colour arises because the solution contains:

1. green Cu2+ ions
2. green CrO4²- ions
3. blue Cu2+ ions and green CrO4²- ions
4. blue Cu2+ ions and yellow CrO4²- ions

Correct answer: blue Cu2+ ions and yellow CrO4²- ions

Solution

Hydrated Cu2+ is blue and CrO4²- is yellow; together they make the solution look green.

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