Pb and Sn are extracted from their chief ore by
Carbon reduction and self reduction
Self reduction and carbon reduction
Electrolysis and self reduction
Self reduction and electrolysis
Bauxite is the ore of
Potassium
Iron
Copper
Aluminium
In the extraction of copper, the reaction which does not take place in Bessemer converter is
2CuFeS2 + O2 → Cu2S + FeS + SO2
2Cu2O + Cu2S → 6Cu + SO2
2Cu2S + 3O2 → 2Cu2O + 2SO2
2FeS + 3O2 → 2FeO + 2SO2
The flux CaO is used to remove gang.This is getting from
CaCO3
CO
Ca(OH)2
boron
The metal getting from blast furnace is
Steel
Medium steel
Pig iron
Mild steel
During the extraction of iron from haematite ore, the produced slag is
BeSiO3
MgSiO3
FeSiO3
CaSiO3
The purpose of smelting an ore is
To oxidise it
To reduce it
To separate volatile impurities
To obtain an alloy
In the process of electrolytic refining of metal M, the anode, the cathode and the electrolyte are
impure M, pure M , the metal salt
the metal salt, impure M, any salt
the metal salt pure M any salt
pure M impure M the metal salt
Which of the following substances cannot be used as a starting material for the preparation of ammonia?
Urea
Nitrobenzene
Ammonium salts
Metal nitrides
Which method is used to concentrate the ore of Aluminium?
Leaching
Froth floatation
Magnetic separation
Calcination
