Questions
Which of the oxide groups among the following cannot be reduced by carbon?
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By Expert Faculty of Sri Chaitanya
a
Fe2O3, ZnO
b
Cu2O, SnO2
c
CaO, K2O
d
PbO, Fe2O3
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Correct option is C
Highly reactive metals like K and Ca cannot be reduced by carbon. The oxides of less electropositive metals like Fe, Zn, Pb, Sn, Cu etc. are reduced by strongly heating them with coal or coke, in the blast furnace.
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The phenomenon of removing layers of basic oxides from metals before electroplating is called
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