__________ acts as a reducing agent during the extraction of iron from the pyrites ore.
A.
Sodium is found in the native state.B.
Metals can be recovered from their ores by chemical methods.C.
Metallic sodium is obtained by electrolysis of molten sodium chloride.D.
In calcination, the ore is heated with calcium.E.
In electrolytic refining of copper, pure copper is taken as anode.A.
The presence of carbon in pig iron makes it very soft and malleable.B.
Azurite is an ore of aluminium.C.
Aluminium is extracted by heating aluminium oxide with coke in furnace.D.
The reducing agent used in the blast furnace to reduce Fe2O3 to Fe is lime stone.The ores that are concentrated by floatation method are
Carbonates
Sulphides
Oxides
Phosphates
Which of the following metal is obtained by leaching its ore with dilute cyanide solution
Silver
Titanium
Vanadium
Zinc
Which method of purification is represented by the following equation?
Cupellation
Polling
Van Arkel
Zone refining
C.
Van Arkel
Van Arkel method of purification of metals involves converting the metal to a
volatile stable compound
volatile unstable compound
non-volatile stable compound
None of the above