Class 12 Chemistry Metallurgy General Principles and Processes of Isolation of Elements
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
Correct answer: (c) 
Solution: Furnaces are lined with calcium oxide because it is refractory and basic.
Hence, Option "C" is the correct answer.

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general principles and processes of isolation of elements
metallurgical operations
metallurg
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general principles and processes of isolation of elements
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