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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 102

Which chemical produces the bright red colour in fireworks?

  1. Sodium
  2. Sulphur
  3. Magnesium
  4. Strontium
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (D) Strontium

Explanation

Firework colours: strontium (red), barium (green), copper (blue), sodium (yellow).

  • (A) Incorrect

    Wrong: gives yellow.

  • (B) Incorrect

    Wrong: a fuel, not a colourant.

  • (C) Incorrect

    Wrong: gives brilliant white.

  • (D) Correct

    Correct: strontium salts give crimson red.

  • (E) Incorrect

    Wrong: only one of the options A–D is correct.