Q. Which element is responsible for the green color of fireworks?

A
Barium
B
Iron
C
Lithium
D
Cobalt
Solution:

Barium is a metallic element chemically resembling calcium but more reactive. It is a soft, silvery metal and when cut it quickly turns a black color due to the formation of barium oxide, (BaO). It is also highly reactive with water or alcohol.

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