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Question
Pick out the wrong statement?
Options:
A .  Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as
B .  Graphite refractories are also called plumbago refractories
C .  Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
D .  Calcined magnesite is also called dead burnt magnesite
Answer: Option C
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