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Question

(NH4)2Cr2O7 (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is :

A
Cr2O3
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B
CrO2
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C
Cr2O4
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D
CrO3
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Solution

The correct option is A Cr2O3
(NH4)2Cr2O7N2+4H2O+Cr2O3

Cr2O3 is green coloured powder in air.

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