Which of the following statements is incorrect

Options

A. Cassiterite ore of tin contains the impurites of wolframite which are separated by electromagnetic separator
B. Tin metal is obtained by the carbon reduction of black tin
C. In the extraction of lead from galena the roasting and self reduction are carried out in the same furnace at different temperature
D. Reducing agent of hacmatite in blast furnaces coke in upper part and CO in lower part of furnace

Answer

A, B

Explanation

Cassiterite (or) tinstone `(SnO_(2))` is a non magnetic substance which contains magneti impurity wolfromite `(FeWO_(4))` . So they can be separated by magnetic separation.
Sn metal is obtained by the .Carbon reduction of `SnO_(2)` (black tin)
`SnO_(2)+2C to Sn+2CO`
During the extraction of lead roasting is done in reverbaratory furnace where as smelting is done in blast furnace.
The reducing agent of `Fe_(2)O_(3)` (Haematite) in Blast furnace at upper part is .CO. and at lower part is .coke..