Q. Which among the following would cause the bright red color due to bursting of crackers?
Answer: Strontium
Notes: Generally, strontium carbonate is used for red fireworks; calcium chloride is used in orange fireworks; sodium nitrate is used in yellow fireworks; barium chloride is used in green fireworks; copper chloride is used in blue fireworks. Similarly, some other colors are produced by using mixture of metal salts. For example, purple fireworks are produced by using a mixture of strontium (red) and copper (blue) compounds.