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The chief disadvantage of the solid-state route is

  • A.coarse, agglomerated and chemically inhomogeneous product
  • B.the high cost of the starting carbonates and oxides used
  • C.that it cannot make multicomponent compounds at all
  • D.that it requires a controlled atmosphere throughout

Answer: A

Mixing is only as good as the milling, so composition varies from grain to grain and the long hot hold coarsens everything. It remains the dominant industrial route because it is cheap and scales, not because the powder is good.

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