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When (NH4)2Cr2O7 is heated, the gas evolved is

1. N2
2. NO2
3. O2
4. N2O

Correct answer: N2

Solution

When ammonium dichromate ((NH4)2Cr2O7) is heated, it undergoes thermal decomposition to produce nitrogen gas (N2), water vapor (H2O), and chromium(III) oxide (Cr2O3).

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