BPSC – Combined Competitive Examination · প্রশ্ন 40
Which of the following are the constituents of a soda-acid fire extinguisher?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (C) Dil. sulphuric acid and sodium bicarbonate solution
ব্যাখ্যা
In a soda-acid extinguisher, H₂SO₄ reacts with NaHCO₃ solution to produce CO₂ under pressure.
- (A) ভুল
Wrong: aluminium sulphate is used in foam extinguishers.
- (B) ভুল
Wrong: sodium bicarbonate, not carbonate, is used.
- (C) সঠিক
Correct: they react to release CO₂ that smothers the fire.
- (D) ভুল
Wrong: wrong base and acid strength.