Q42 / 105 · NTA Abhyas (JEE Main) 2020 · Chemistry · d and f Block Elements

Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is

A
${CrO}_{3}$
B
$Cr$
C
$CO$
Correct answer
D
${Cr}_{2} O_{3}$

Solution

Ammonium dichromate

[{({NH}_{4})}_{2} {Cr}_{2} O_{7}]

on heating decomposes producing green powder of

{Cr}_{2} O_{3}

and

N_{2} (g)

is evolved.

Hence, the correct answer is option: 'D'.

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