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State PCS PYQPrelims 2022

BPSC – Combined Competitive Examination · Question 96

Which of the following is called 'quicklime'?

  1. CaCO₃
  2. Ca(OH)₂
  3. CaCl₂
  4. CaO
  5. None of the above / More than one of the above
Show answer & explanation

Answer: (D) CaO

Explanation

Heating limestone gives quicklime (CaO); adding water gives slaked lime Ca(OH)₂.

  • (A) Incorrect

    Wrong: limestone.

  • (B) Incorrect

    Wrong: slaked lime.

  • (C) Incorrect

    Wrong: calcium chloride.

  • (D) Correct

    Correct: calcium oxide is quicklime.

  • (E) Incorrect

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