Discussion
Assertion (A): A firing schedule for a clay containing organic matter includes a hold before the temperature rises further.
Reason (R): Carbon must be oxidised before the body becomes dense enough to seal it in.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the timing constraint. Carbon burns out over roughly 300 to 900 degrees and needs oxygen reaching it through open porosity. If the temperature rises far enough for vitrification to begin sealing the surface, the remaining carbon is trapped, and it later reacts or expands to give a black core or bloating. The hold gives the oxidation time to finish while the body is still permeable.
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