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Chemistry Medium PPSC Uploaded: 04 Sep 2026

What is quicklime chemically known as?

  • A Calcium sulfate
  • B Calcium carbonate
  • C Calcium hydroxide
  • D Calcium oxide
Correct Answer: Option D — Calcium oxide
Explanation:
Quicklime is the common name for calcium oxide (CaO), produced by heating limestone (calcium carbonate) at high temperatures, and it reacts vigorously with water to form calcium hydroxide, releasing heat.
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