3. In the zone melting approach, which of the following principles was used? a) Impurities concentrate in the liquid phase than in gaseous phase b) Impurities concentrate in the solid than in liquid phase c) Impurities concentrate in the gaseous phase than in the solid phase d) Impurities concentrate in the liquid phase than in the solid phase
. D. Explanation: zone melting method make the use of the principle that impurities usually concentrate in the liquid rather than in the solid phase. impurities are therefore 'swept out' of the crystal by the moving molten zone.
