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CrO3 dissolves in aqueous NaOH to give:

1. Cr2O7^2−
2. CrO4^2−
3. Cr(OH)3
4. Cr(OH)2

Correct answer: CrO4^2−

Solution

CrO3 dissolves in aqueous NaOH to form potassium chromate (CrO4^2−).

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