Question

The lime which has high calcium oxide content and is dependent for setting and hardening solely on the absorption of carbon dioxide from the atmosphere is known as
1. Quick lime
2. Fat lime
3. Hydraulic lime
4. Hydrated lime

Answer 1

Correct Answer - Option 2 : Fat lime

Explanation:

Fat lime:

• Fat lime contains a high (or rich) amount of (93% to 95%) Calcium Oxide (CaO), that’s why the impurities in fat Lime are as low as lesser than 5%.
• This lime slakes vigorously due to which its volume increases by 2 to 2.5 times than its original volume. Hence it is referred to as fat lime.
• It posses a perfectly white colour, hence also termed as white lime.
• Properties- Slow setting, High plasticity, Soluble in water, Vigorous slaking, Perfectly white color

Types of lime	Use
Quick lime [CaO]	Steel making process Soil stabilization
Fat lime	Plastering in unimportant works Whitewashing
Hydraulic lime	All type of masonry work To make concrete which sets underwater also
Hydrated lime [Ca(OH)2]	Lime mortar Production of ammonia gas Paper Industry