Discussion
Assertion (A): The shrinking core model applies better than progressive conversion to a dense non-porous solid.
Reason (R): The fluid cannot penetrate the interior, so reaction is confined to a moving front.
Answer: C
Both are true and the reason gives the criterion: a highly porous solid admits the fluid everywhere and the progressive conversion picture then fits better. Porosity is the deciding property. Dense solids give a sharp reaction front.
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