Extraction of Metals - Result Question 45

####45. The carbon-based reduction method is not used for the extraction of

(2013 Adv.)

(a) tin from SnO2

(b) iron from Fe2O3

(c) aluminium from Al2O3

(d) magnesium from MgCO3,CaCO3

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Solution:

  1. Al has greater affinity for oxygen, hence oxide is not reduced by carbon. MgO and CaO (formed in the calcination from carbonates) are stable species and not reduced by carbon.

During Smelting SnO2+C1300CSn+CO

2Fe2O3+3CΔ4Fe+3CO2



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