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Assertion: a material safe in bulk is necessarily safe as a nanopowder. Reason: its chemical composition is unchanged.

  • A.both the assertion and the reason are true but the reason does not explain the assertion
  • B.the assertion is true but the reason given for it is false
  • C.the assertion is false although the reason offered is a true statement in itself
  • D.both the assertion and the reason are true and the reason explains the assertion

Answer: C

The composition is indeed the same, but size and surface chemistry decide where a particle can go in the body and how reactive it is once there. Each material must be assessed at each size rather than cleared by its bulk record.

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