Sphalexite is
Cu2S
Cu2O
ZnS
ZnO
In the metallurgy of silver and gold ,the leaching agents are
NaCN and O2
NaCN and CO2
KCN and O2
'A' or 'C'
In the electrolytic cell for the extraction of Al ,the gases formed in anode are
O2 and CO2
CO and CO2
CO and O2
CO2 and N2
____________ is the most significant thermodynamic concept which help the metallurgical transformations .
Internal energy
Enthalpy
Gibb's energy
ActivityΔG=ΔH-TΔS; at specialized temperature also ΔG = -RT1mk.In thermodynamics, the Gibbs free energy is a thermodynamic potential that measures the "useful" or process-initiating work obtainable from a thermodynamic system at a constant temperature and pressure (isothermal, isobaric).
Heating of ores are called
Leaching
Smelting
Calcination
Concentration
The chemical formula of bauxite is
Na3AlF6
Al2O3
Al2O3.2H2O
KAlSi3O8
Melting pig iron with scrap iron and coke is called
Wrought iron
Spongy iron
Cast iron
Steel
Van Arkel method is used for the refining of
Zn
Zr
Ti
both a and c
The depressant used in an ore containing ZnS and PbS is
KCN
NaOH
NaCl
NaCN
Removal of unwanted material from the ore is known as
Froth floatation
