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On heating chromite (FeCr2O4) with Na2CO3 in air, which of the following product is obtained?

1. Na2Cr2O7
2. FeO
3. Fe2O4
4. Na2CrO4

Correct answer: Na2CrO4

Solution

When chromite (FeCr2O4) is heated with Na2CO3 in the presence of air, it undergoes oxidation to form sodium chromate (Na2CrO4). This is a standard reaction in the extraction of chromium.

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