Chemistry - Metallurgy Question with Solution | TestHub
ChemistryMetallurgyPurification of Ores, Calcination and roastingMedium2 minQB
ChemistryMediumsingle choice
Oxidation of ore is involved in :
Options:
Answer:
C
Solution:
Oxidation involves increasing the oxidation state of a metal.
A. Calcination of calamine (ZnCO₃) involves heating to form ZnO and CO₂. This is decomposition, not oxidation of the metal.
B. Heating hematite (Fe₂O₃) with aluminum is a reduction process (thermite reaction), not oxidation.
C. Roasting of galena (PbS) involves heating in air to form PbO and SO₂. Here, sulfur is oxidized, and lead's oxidation state remains +2, but the overall process is an oxidative treatment of the ore.
Therefore, roasting of galena involves oxidation.
Stream:JEESubject:ChemistryTopic:MetallurgySubtopic:Purification of Ores, Calcination and roasting
⏱ 2mℹ️ Source: QB
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