NextMockपरीक्षा शोधा, उदा. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · प्रश्न 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
उत्तर दाखवा आणि स्पष्टीकरण

उत्तर: (D) Strontium

स्पष्टीकरण

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

  • (A) चूक

    Wrong: gives yellow.

  • (B) चूक

    Wrong: a fuel, not a colourant.

  • (C) चूक

    Wrong: gives brilliant white.

  • (D) बरोबर

    Correct: strontium salts give crimson red.

  • (E) चूक

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