Discussion
Consider the following statements about powder synthesis.
1. Solid-state reaction is cheap but gives coarse, less homogeneous powder.
2. Sol-gel routes give fine homogeneous powders at higher cost.
3. Coprecipitation mixes the components mechanically rather than in solution.
Answer: C
The first two are correct. The third describes the opposite of coprecipitation, whose whole advantage is that mixing happens in solution at a scale no mechanical method can approach. Homogeneity at that scale is what shortens the later calcination.
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