Discussion
Assertion (A): Solid-state synthesis usually needs milling after calcination.
Reason (R): The reaction proceeds by interdiffusion at points of contact, so the product forms as hard agglomerates.
Answer: D
Both are true and the reason gives the mechanism: prolonged heating that brings the particles into reactive contact also sinters necks between them, and those necks have to be broken by milling before the powder can be formed.
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