Flux is used to remove
Basic impurities
Acidic impurities
All types of impurities
Both acidic and basic impurities
Metals are seperated from
Ore
Compounds
Minerals
Metallic oxides
Aluminium is extracted by the electrolysis of
Bauxite
Alumina
Alumina mixed with molten cryolite
Molten cryolite
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 statements is incorrect regarding metals?
Metals are ductile
Metals are poor conductors of heat
Metals are sonorous
Metals have a shiny appearance
The main function of roasting is
To remove the volatile matter
To convert the ore into oxide
Both (a) and (b)
To make slag
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
The purpose of smelting an ore is
To oxidise it
To reduce it
To separate volatile impurities
To obtain an alloy
Which of the following substances cannot be used as a starting material for the preparation of ammonia?
Urea
Nitrobenzene
Ammonium salts
Metal nitrides
During the extraction of iron from haematite ore, the produced slag is
BeSiO3
MgSiO3
FeSiO3
CaSiO3
