Ammonium dichromate is used in some fire works. Then green colored powder blown in air is :

C r O_{3}

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C r_{2} O_{3}

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C

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C r O (O_{2})

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Solution

The correct option is C $C r_{2} O_{3}$
$(N H_{4})_{2} C r_{2} O_{7} \to C r_{2} O_{3} (s) + N_{2} (g) + 4 H_{2} O (g)$

Green coloured powder blown in the air is $C r_{2} O_{3}$ .

Hence, option B is correct.

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