The Green color seen in firework displays is due to the chloride salt of:

 a) Sodium
 b) Barium
 c) Strontium
 d) Calcium
SSC CGL-15

Barium.
Barium chloride provides green colour to firework displays.
Source:http://chemistry.about.com/od/fireworkspyrotechnics/a/fireworkcolors.htm
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