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Assertion (A): Milling a ceramic powder often lowers its chemical purity slightly.
Reason (R): The grinding media and mill lining wear and contribute their own material to the batch.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the mechanism: every collision removes a little of the media, and over a long grind that contamination becomes measurable, which is why the media are chosen to match the powder wherever possible.

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