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Get Answers to all your Questions
10.21 Describe the importance of the following : (i) limestone (ii) cement (iii) plaster of paris.
Answers (1)
(i) Limestone-
The chemical formula is .
Importance of limestone is-
- It is used as a building material in the form of marble and in the manufacture of quick lime
- Calcium carbonate along with magnesium carbonate is used as a flux in the extraction of metals such as iron.
- It is also used as an antacid, mild abrasive in tooth paste, a constituent of chewing gum, and a filler in cosmetics.
(ii) Cement-
Cement is an important building material. It is a mixture of tricalcium silicate() and tricalcium aluminate(
).
Importance of cement-
It is used in concrete and reinforced concrete, in plastering and in the construction of bridges, dams and buildings
(iii) Plaster of Paris-
It is a hemihydrate of calcium sulphate. It is obtained when gypsum, , is heated to 393 K.
Importance of POP-
It is used in medicine as surgical bandages and also it is used for making casts and moulds.
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