NCERT Important Questions Class 10 Science
CBSE 2022-2023.
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
NCERT book extra.
(i) Differentiate between calcination and roasting. (ii) Suggest a method of refining of copper.
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(i) Roasting: It is the process of heating sulphide ore in the presence of excess of air to form oxide.
2MS + 3O₂ ⟶ 2MO + 2SO₂↑
Calcination: It is the Process of heating carbonate ore in the presence of limited supply of air to form oxide.
MCO₃ ⟶ MO +CO₂↑
(ii) Copper can be refined by electrolytic method. The electrolyte is a solution of copper sulphate. Cathode is a strip of pure copper. Anode is impure copper