Discussion
Assertion (A): A raw meal may meet its residue specification and still burn badly.
Reason (R): The residue figure says nothing about which mineral the coarse particles are.
Answer: C
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. Coarse calcite reacts readily, but coarse quartz does not: it must be reached to its centre by solid-state diffusion, and a large grain cannot be. Two meals with identical residues therefore burn quite differently according to what the residue consists of, which is why the coarse fraction is examined mineralogically.
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