Which of the following statement(s) is (are) incorrect? (a) In serpecks process, silica is remov...

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Which of the following statement(s) is (are) incorrect?
(a) In serpecks process, silica is removed by heating the bauxite to \( 1800^{\circ} \mathrm{C} \) with coke in a current of \( \mathrm{N}_{2} \).
(b) In extraction of lead from galena, roasting and self reduction takes place in the same furnace but under different conditions of temperature and supply of air.
(c) The tin is obtained by the carbon reduction of black tin.
(d) None of these
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