Which of the following statements is incorrect?

Options

A. Cassiterite ore of tin contains the impurities of Wol - framite 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 in the same furnace at different temperatures.
D. Reducing agent of haematite in blast - furnaceis coke in upper part and CO in lower part of furnace.

Answer

D