Ammonium dichromate is used in fire works. The green colored powder blow in the air is:

C r O_{3}

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{C r}_{2} O_{3}

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C r

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C r O (O_{2})

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Solution

The correct option is C ${C r}_{2} O_{3}$
$({N H}_{4})_{2} {C r}_{2} O_{7} Δ - \to {C r}_{2} O_{3} + N_{2} + 4 H_{2} O$

The green-coloured $C r_{2} O_{3}$ powder is blown in the air by the large volume of $N_{2}$ and water vapour produced and settles like dust from the volcano.

Hence, the correct option is $B$

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