Which of the following statement(s) is (are) incorrect?

Chemistry General Principles and Processes of Isolation of Elements ( Not In Syllabus ) General Single Correct MCQ

Published on: August 11, 2026

In Serpeck’s process silica is removed by heating the bauxite to 1800°C with coke in a current of N2A

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

The tin is obtained by the carbon reduction of black tin.

None

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The correct answer is:

White bauxite contains the impurity of silica which is removed by heating with coke in a stream of N2

SiO2 + 2C Si+ 2CO ; Al2O3 + 3C + N2 2AlN + 3CO

2PbS + 3O2 2PbO + SO2 ; 2PbO + PbS 3Pb + SO2

SnO2 (black tin contains 60–70% SnO2) + 2C Sn + 2CO.

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