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K2Cr2O7 on heating with aqueous NaOH gives:

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

Correct answer: CrO4^2−

Solution

K2Cr2O7 reacts with aqueous NaOH to form potassium chromate (CrO4^2−).

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