Question -
Answer -
(i)┬аChemically,limestone is CaCO3.
Importance oflimestone
(a)It is used in the preparation of lime and cement.
(b)It is used as a flux during the smelting of iron ores.
(ii)┬аChemically, cementis a mixture of calcium silicate and calcium aluminate.
Importance ofcement
(a)It is used in plastering and in construction of bridges.
(b)It is used in concrete.
(iii)┬аChemically, plaster ofParis is 2CaSO4.H2O.
Importance ofplaster of Paris
(a)It is used in surgical bandages.
(b)It is also used for making casts and moulds.