Roasting te oxidation hunda hai, jado ore nu oxygen de vich heat karde ne, ja pyrites (FeS2) varge. Calcination te decomposition hunda hai, jado carbonate ore nu sirf heat karde ne bina oxygen de, ja limestone (CaCO3). Roasting sulphide ores te lagda hai, calcination carbonate ores te.
Par mainu ta es de notes yaad karne vich hi dandh ho reha hai. Gym vich diesel di smell aundi hai te main es Chapter 6: General Principles te Isolation of Elements, de headings nu dekh reha haan, bhulna de bachan lagge ne.
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