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Calcium Oxide or Quick Lime, CaO:
It is prepared on a commercial scale by heating limestone (CaCO3) in a rotary kiln at 1070-1270 K.
CaCO3 -----> CaO + CO2
Uses:
(i) It is an important primary material for manufacturing cement and is the cheapest form of alkali.
(ii) It is used in the manufacture of sodium carbonate from caustic soda.
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