Q. Which of the following is the green coloured powder produced when ammonium dichromate is used in fire works?
A) $Cr$
B) ${CrO}_{3}$
C) ${Cr}_{2}O_{3}$
D) $CrO(O_{2})$
Explanation
(c)
Ammonium dichromate on heating gives green coloured powder of ${Cr}_{2}O_{3}$.
$2\left( {NH}_{4} \right)_{2}{Cr}_{2}O_{7}\ \overset{\mathrm{\Delta}}{\rightarrow}2\left( {NH}_{4} \right)_{2}{CrO}_{4} + {Cr}_{2}O_{3} + 3O_{2}$
chromic
oxide
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.