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  9. Q72

UKPSC PCS 2010 · Question 72 of 138

In the ordinary fire extinguisher Carbon dioxide is generated by the reaction of

Science

  1. ALimestone and dilute sulphuric acid
  2. BMarble powder and dilute hydrochloric acid
  3. CSodium bicarbonate and dilute sulphuric acidCorrect
  4. DMagnesite and dilute hydraulic acid

Answer: C. Sodium bicarbonate and dilute sulphuric acid

Explanation

CO2 in an ordinary extinguisher comes from sodium bicarbonate + dilute sulphuric acid.

Source: UKPSC Lower PCS Prelims 2010 (Combined Lower Subordinate Services Exam), held 2011

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