Which of the following is true for calcination of a metal ore?

Chemistry · JEE Advanced · NTA Exams — General Principles and Processes of Isolation of Elements

1. It makes the ore more porous
2. The ore is heated to a temperature when fusion just begins
3. Hydrated salts lose their water of crystallisation
4. Impurities of S, As and Sb are removed in the form of their volatile oxides

Answer

(A) It makes the ore more porous, (C) Hydrated salts lose their water of crystallisation

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