Furnaces are lined with calcium oxide because
(a) it gives off oxygen on heating
(b) it gives strong light on heating
(c) it is refractory and basic
(d) it is not affected by acids
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In the Blast Furnace, limestone is added as one of the raw materials. That decomposes to form basic calcium oxide in the heat of the furnace. ... In the basic oxygen steel making process, quicklime (calcium oxide) is added to the furnace to remove impurities in the iron. Again, this won't affect the magnesium oxide lining.
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Answer:
(C) it is refractory and basic
Explanation:
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