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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · પ્રશ્ન 102

Which chemical produces the bright red colour in fireworks?

Sodium
Sulphur
Magnesium
Strontium
None of the above / More than one of the above

જવાબ બતાવો અને સમજૂતી

જવાબ: (D) Strontium

સમજૂતી

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

(A) ખોટો
Wrong: gives yellow.
(B) ખોટો
Wrong: a fuel, not a colourant.
(C) ખોટો
Wrong: gives brilliant white.
(D) સાચો
Correct: strontium salts give crimson red.
(E) ખોટો
Wrong: only one of the options A–D is correct.