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Ammonium dichromate is a component of certain fireworks (the 'volcano' reaction). The green powder thrown into the air on decomposition is:

1. CrO3
2. Cr2O3
3. Cr
4. CrO(O2)

Correct answer: Cr2O3

Solution

Thermal decomposition of (NH4)2Cr2O7 produces green chromium(III) oxide, Cr2O3, along with N2 and steam.

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