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Chemistry CBSE Live product
Class 10 (2025-26)
Metals and non-metals
Annual Revision V - Metals and non-metals
7.
Extraction of low reactive metals
Question:
2
m.
Select the right option to answer the question:
A metal that exists as liquid at room temperature is obtained by heating its sulphide in the presence of air.
i.
Identify the metal.
Mercury
Lead
Sodium
Copper
ii.
Give the reactions involved.
\(2CuS(s) + 3O2(g) → 2CuO(s) + 2SO_2(g)\) and \(2CuO(s) → 2Cu(l) + O_2(g)\)
\(NaS(s) + 3O2(g) → NaO(s) + 2SO2(g)\) and \(NaO(s) → 2Na_2O(l) + O_2(g)\)
\(2HgS(s) + 3O_2(g) → 2HgO(s) + 2SO_2(g)\) and \(2HgO(s) → 2Hg(l) + O_2(g)\)
\(PbS(s) + O_2(g) → PbO(s) + SO_2(g)\) and \(PbO(s) → PbO(s) + O_2(g)\)
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