Metals exist in various from in combined state such as…………..
a) oxides
b) carbonated
c) silicates
d) all of these
Some reactive metals are extracted by.……… process.
a) electroplating
b) refining
c) electrochemical
d) electrostatic
The section of the process for extraction is mainly depending on ………….. factories.
a) reactivity of metal contain in ores
b) nature of gangue present in ores
c) types of ores
d) all of these
Concentration of ore:-
The removal of useless rocky portion of the ore is called…………….
a) subtraction from ore
b) concentration of ore
c) crushing of ore
d) grinding of ore
Oreis an impure metal containing large amount of ………….. materials.
a) gold
b) rocky
c) sand
d) both b & c
