Discussion
Assertion (A): Wollastonite is preferred to limestone as a source of lime in fast-fired tile.
Reason (R): Limestone decomposes and releases carbon dioxide, which a fast firing cannot accommodate.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Calcium carbonate decomposes around 800 to 900 degrees and releases carbon dioxide, which must escape through the body before the surface seals or it causes bloating and black coring. A fast fire does not allow the time. Wollastonite is already a calcium silicate, so it supplies lime with no gas evolution at all.
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