UPSSSC PET 2026 (25 Oct Shift 1)
Which of the following is the chemical formula of quicklime ?
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Answer: Option B — CaO
Detailed Solution
Quicklime (unslaked lime) is calcium oxide, CaO. Adding water to it gives slaked lime, Ca(OH)₂; CaCO₃ is limestone and CaCl₂ is calcium chloride.
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Common Names & Chemical Formulas — UPSSSC PET Preparation
This question tests your understanding of Common Names & Chemical Formulas, a key topic in the UPSSSC PET General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
This topic covers the common names, chemical names and formulas of everyday substances, such as common salt, baking soda, washing soda, bleaching powder, plaster of Paris, gypsum, quicklime and blue vitriol, along with the Latin names and symbols of elements. These are high-frequency memory questions. For example, baking soda is sodium hydrogen carbonate (NaHCO3), washing soda is Na2CO3.10H2O, and blue vitriol is copper sulphate pentahydrate. Remember the elements whose symbols come from Latin names, such as Na (natrium) for sodium, Fe (ferrum) for iron and Ag (argentum) for silver. Practise the common names and chemical formulas questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.