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
The flux CaO is used to remove gang.This is getting from
CaCO3
CO
Ca(OH)2
boron
Aluminium is extracted by the electrolysis of
Bauxite
Alumina
Alumina mixed with molten cryolite
Molten cryolite
Which of the following statements is incorrect regarding metals?
Metals are ductile
Metals are poor conductors of heat
Metals are sonorous
Metals have a shiny appearance
The purpose of smelting an ore is
To oxidise it
To reduce it
To separate volatile impurities
To obtain an alloy
During the extraction of iron from haematite ore, the produced slag is
BeSiO3
MgSiO3
FeSiO3
CaSiO3
Metals are seperated from
Ore
Compounds
Minerals
Metallic oxides
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
