Lime basics used in construction chemistry: Which of the following statements about quick lime and slaked lime is/are correct?

Introduction / Context:
Lime products are central to mortars, soil stabilisation, and heritage conservation. Distinguishing between quick lime and slaked lime is fundamental for mixing, safety, and performance on site.

Given Data / Assumptions:

• Chemical names: quick lime = calcium oxide (CaO); slaked lime = calcium hydroxide (Ca(OH)2).
• Slaking is the hydration reaction of CaO with water.

Concept / Approach:
Quick lime is produced by calcining limestone (CaCO3 → CaO + CO2). Adding water to quick lime (slaking) yields slaked lime (CaO + H2O → Ca(OH)2 + heat). Slaked lime is then used in mortars and putty. All listed statements are consistent with this reaction pathway and naming convention.

Step-by-Step Solution:

Verification / Alternative check:
Standard chemistry references confirm the exothermic slaking reaction and the material designations used in construction specifications.

Why Other Options Are Wrong:
Since A–D are all correct, any single-choice alternative would be incomplete; hence E is the only comprehensive correct option.

Common Pitfalls:

• Confusing “hydrated lime” with gypsum or cement.
• Underestimating the heat released during slaking, which is a safety hazard.

Final Answer:
All of the above