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An aqueous solution of CuCrO4 appears green. This colour arises because the solution contains:
- green Cu2+ ions
- green CrO4²- ions
- blue Cu2+ ions and green CrO4²- ions
- 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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