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Question

Ammonium dichromate is used in some fireworks. The green-coloured powder blown in the air is (IIT JEE,1997)

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
Ammonium dichromate is used in some fireworks. The green-coloured powder which blows in air is Cr2O3.
(NH4)2Cr2O7Cr2O3+N2+4H2O

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