The carbon-based reduction method is NOT used for the extraction of
(a) tin from `SnO_2`
(b) iron from `Fe_(2) O_3`
(c) aluminium from alumina
(d) magnesium from `MgCO_(3). CaCO_(3)`

Options

A. a,b
B. c,d
C. a,b,c
D. b,c,d

Answer

B

Explanation

Aluminium has a greater affinity for oxygen, hence oxide is not reduced by carbon. MgO, CaO (formed in the calcination from carbonates) are stable pieces and not reduced by carbon. `SnO_(2), Fe_(2)O_3` can be reduced by carbon as follows, `SnO_2 + 2C rarr Sn + 2 CO 2 Fe_(2)O_3 + 3C rarr 4 Fe + 3 CO_2`