Roasting of ores is done in

Options

A. Presence of an execess of air or oxygen
B. Presence of superheated steam
C. Absence of air
D. Presence of a limited supply of air

Answer

a

Explanation

Once n ore is concentrated, it may be neccessry to convent the mineral to a compound more suitable the reduction. Reasting is the process of heating a comecetrated ore below its melting point in the pressence of execes of air to obtain the oxide .
Sulphide minerals such as zinc ore (containing the minerals aphalterite `ZnS` are usually roasted befor reducing them to the metal).
`2ZnS(s) + 3O_(2)(g) overset (heat) To 2 ZnO(s) + 2SO_(2)(g)`
`Delta H = - 684 kJ mol^(-1)`