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When chromium trioxide (CrO3) is dissolved in aqueous sodium hydroxide, the chromium-containing species formed in solution is

1. Cr2O7²-
2. CrO4²-
3. Cr(OH)3
4. Cr(OH)2

Correct answer: CrO4²-

Solution

CrO3 is an acidic oxide that reacts with NaOH to give the yellow chromate ion CrO4²-; dichromate predominates only in acidic medium.

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