Which of the following statement is incorrect ?

Options

A. `FeSiO_(3)` is obtained as slag in the extraction of iron from haematite ore.
B. In Hall`-` Heroult process, the electrolyte used in a molten mixture of alumina and cryolite.
C. Lead is extracted form its chief ore galena by both carbon reduction as well as self reduction.
D. Boron is obtained by thermal decomposition of `BI_(3)`.

Answer

1

Explanation

`(1) " "FeSiO_(3)` is obtained as slag in the metallurgy of copper from pyrites.
`(2)` Electrolysis is molten alumina dissolved in cryolite.
(3)` 2PbS+3O_(2)rarr 2PbO+2SO_(2)`
`PbS+2PbOrarr3Pb+SO_(2)("self reduction")," "PbO+C rarrPb+CO("carbon reduction")`
`(4)" "2BI_(3)overset(Delta)rarr 2B+3I_(2)("Van Arkel method")`