Question

What is slaked lime?
1. Calcium bicarbonate
2. Calcium hydroxide
3. Calcium oxide
4. Calcium carbonate

Answer 1

Correct Answer - Option 2 : Calcium hydroxide

The correct answer is Calcium hydroxide.

• Slaked lime is chemically known as Calcium hydroxide.
• Its chemical formula Ca(OH)₂.
• Slaked lime is obtained by the action of water on calcium oxide.
• When it is mixed with water, a small proportion of it dissolves, forming a solution known as limewater, the rest remaining as a suspension called milk of lime.
• Uses:
  • It is used for whitewashing. It reacts with carbon dioxide slowly and forms a layer of Calcium Carbonate on the wall which gives shine to the wall.
  • It is used in sewage treatment. It is used as a flocculant in water.
  • It is used in pickles.
  • It is used to process water for various beverages.
  • It is used in the paper industry.

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• Calcium bicarbonate is also called calcium hydrogen carbonate.
  • It has a chemical formula Ca(HCO3)2.
• ​Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO.
• Calcium carbonate is a chemical compound with the formula CaCO3.
  • It is a common substance found in rocks as the minerals calcite and aragonite and is the main component of eggshells, snail shells, seashells, and pearls.