Bauxite is the ore of
Potassium
Iron
Copper
Aluminium
Which of the following metal is leached by cyanide process?
Ag
Na
Al
Cu
The purpose of smelting an ore is
To oxidise it
To reduce it
To separate volatile impurities
To obtain an alloy
Which method is used to concentrate the ore of Aluminium?
Leaching
Froth floatation
Magnetic separation
Calcination
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
Aluminium is extracted by the electrolysis of
Bauxite
Alumina
Alumina mixed with molten cryolite
Molten cryolite
Flux is used to remove
Basic impurities
Acidic impurities
All types of impurities
Both acidic and basic impurities
The metal getting from blast furnace is
Steel
Medium steel
Pig iron
Mild steel
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
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
