QuestionNo:1

Gravity separation method is based upon

[A] Preferential washing of ores and gangue particles
[B] Difference in densities of ore particles and impurites
[C] Difference in chemical properties of ore particles and impurites
[D] None of these.



QuestionNo:2

Which method is used for the purification of bauxite ore ?

[A] Levigation
[B] Leaching
[C] Electrolysis
[D] Magnetic separation



QuestionNo:3

Which of the following concentration processes will you use when the gangue is light ?

[A] Gravity separation
[B] Magnetic separation
[C] Froth floatation
[D] None of these



QuestionNo:4

In the froth floatation process for the purification of minerals the particles float because

[A] They are light
[B] They are insoluble
[C] Their surface is preferentially wetted by oil
[D] They bear an electrostatic charge



QuestionNo:5

Gravity separation process may be used for the concentration of.

[A] Chalcopyrite
[B] bauxite
[C] Haematite
[D] Calamine



QuestionNo:6

Copper pyrites is concentrated by

[A] Froth floatation process
[B] Gravity separation
[C] Distillation
[D] Fractionation.



QuestionNo:7

Which of the following is used as a foaming agent in froth floatation process?

[A] Pine oil
[B] Amyl xanthate
[C] CuSO₄
[D] KCN



QuestionNo:8

Leaching is a process of:

[A] reduction
[B] concentration
[C] refining
[D] oxidation



QuestionNo:9

Leaching process is used to get:

[A] Ag
[B] Au
[C] both (a) and (b)
[D] none of these



QuestionNo:10

The extraction of metal from the ore is

[A] an oxidation process
[B] a reduction process
[C] a hydration process
[D] a neutralisation process



QuestionNo:11

Carbon cannot be used to reduce

[A] ZnO
[B] SnO₂
[C] Fe₂O₃
[D] Al₂O₂



QuestionNo:12

water gas is the most suitable reducing agent to reduce

[A] A1₃O₃
[B] NiO
[C] Cr₂O ₃
[D] Mn₃ O₄



QuestionNo:13

Hydro metallurgy is used in the extraction of

[A] Cu
[B] Al
[C] Mg
[D] Na



QuestionNo:14

Silver is displaced when zinc is added to aqueous sodium argento cyanide this method of extracting silver is an example for

[A] Leaching
[B] Hydro metallurgy
[C] Pyrometallurgy
[D] Liquation



QuestionNo:15

The weakest reducing agent among the following is

[A] Hydrogen Gas
[B] Coke
[C] Carbon monoxide gas
[D] Aluminium metal