Lime Cement and Mortar Questions and Answers

Q: The process of adding water to quicklime in order to convert into hydrated lime is known as:

Adding water to quicklime is called Slaking.Quicklime (calcium oxide) reacts with water, with much heat and swelling, to form slaked or hydrated lime: CaO + H2O gives Ca(OH)2.Calcination is the earlier step of burning limestone to drive off carbon dioxide and form quicklime. 'Hydration' is the chemical name of the reaction but not the term used for the process, and quenching means rapid cooling of hot metal.

Which of the following is a disadvantage of natural lime over modern cement?

A.Eco-friendliness
B.Lower compressive strength
C.Cost-effectiveness
D.Self-healing property

Exam Year(s)

DSSSB JE - 2023,

Answer: B

A disadvantage of natural lime compared with modern cement is its lower compressive strength. Lime mortar and concrete gain strength slowly by carbonation and stay weaker than cement-based ones. Eco-friendliness, cost-effectiveness and self-healing (lime can reseal small cracks by recarbonation) are listed as advantages of lime, not drawbacks.

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The process of adding water to quicklime in order to convert into hydrated lime is known as:

A.Quenching
B.Hydration
C.Slaking
D.Calcination

Exam Year(s)

RSMSSB JE - 2025, RSMSSB JE Agriculture - 2025, RSMSSB - 2025,

Answer: C

Adding water to quicklime is called Slaking.

Quicklime (calcium oxide) reacts with water, with much heat and swelling, to form slaked or hydrated lime: CaO + H₂O gives Ca(OH)₂.

Calcination is the earlier step of burning limestone to drive off carbon dioxide and form quicklime. 'Hydration' is the chemical name of the reaction but not the term used for the process, and quenching means rapid cooling of hot metal.

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Lime Cement and Mortar Questions and Answers

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