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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

When K2Cr2O7 is heated with aqueous NaOH, it undergoes a reaction to form chromate ions (CrO4^2−) due to the alkaline medium favoring the formation of chromate from dichromate.

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