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
Which is the reducing agent in the extraction of Iron?
CaCO3
FeO
CO
SiO2
Which method is used to concentrate the ore of Aluminium?
Leaching
Froth floatation
Magnetic separation
Calcination
Which of the following metal is leached by cyanide process?
Ag
Na
Al
Cu
The main function of roasting is
To remove the volatile matter
To convert the ore into oxide
Both (a) and (b)
To make slag
The metal getting from blast furnace is
Steel
Medium steel
Pig iron
Mild steel
Metals are seperated from
Ore
Compounds
Minerals
Metallic oxides
The purpose of smelting an ore is
To oxidise it
To reduce it
To separate volatile impurities
To obtain an alloy
The important oxide ore of iron is
Siderite
Haematite
Iron
Bauxite
When a metal is to be extracted from its ore and if the gangue associated with the ore is sillica, then
An acidic flux is needed
A basic flux is needed
Both acidic and basic fluxes are needed
Neither of them is needed
