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Question

Ammonium dichromate is used in fire works. The green coloured powder obtained is:

A
CrO3
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B
Cr2O3
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C
Cr
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D
CrO(O2)
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Solution

The correct option is B Cr2O3
Reaction when (NH4)2Cr2O4 is decomposed,
(NH4)2Cr2O4Cr2O3+N2+4H2O

The green colour is due to the formation of Cr2O3

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