Question

Choose the correct option for the following statements
Statement - 1: Sulphide ore is firstly converted to oxide and then it is subjected to reduction for the extraction of metal.
Statement - 2: In calcination, the ore is heated in a regular supply of air in a furnace at a temperature below melting point of the calcined product.
Statement - 3: Roasting involves heating in absence of air until volatile matter escapes.
Statement - 4: In the metallurgy of aluminium, purified $A{l}_2{O}_3$ is mixed with $N{a}_{3}Al{F}_6$ or $Ca{F}_2$ which increases the melting point of the mix.

• A. TTFF
• B. FFFT
• C. TFFT
• D. TFFF

Answer 1

The correct option is D TFFF

Statement-1 is true as oxides are easier to reduce.
Statement-2 is false because calcination inolves heating in the absence of air.
Statement-3 is false as in roasting, the ore is heated in a regular supply of air in a furnace at a temperature below the melting point of the metal.
Statement-4 is false as in the metallurgy of aluminium, purified $A{l}_2{O}_3$ is mixed with $N{a}_{3}Al{F}_6$ or $Ca{F}_2$ which lowers the melting point of the mix and brings conductivity.