Pb and Sn are extracted from their chief ore by

Options

A. Carbon reduction and self reduction
B. Self reduction and carbon reduction
C. Electrolysis and self reduction
D. Self reduction and electrolysis

Answer

B

Explanation

PbO and `PbSO_(4)` get reduced by PbS itself which is already present in mixture so because the reduction took place by mixture itself, hence is known as self reduction.
`2PbO +PbS overset(Delta) to 3Pb + SO_(2) uarr`
`PbSO_(4) + PbS overset(Delta) to 2Pb + 2SO_(2) uarr`