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Metallurgy Mock Test-7

Question No:1

During electrolytic reduction of Alumina, the reaction at cathode is

[A] 2H2O2->O2+4H+4e
[B] 3F->3F+3E
[C] Al+3+3E->Al
[D] 2H++2e->H2



Question No:2

Observer the following statements regarding purification ofbauxite:
I) During Hall’s process, silica, is removed as Si (vapour)
II) Bauxite ore contaminated withFe2O2O3 is purified in baeyer ‘s process
III) During serpeck’s process, AlN is formed The correct answer is:

[A] I, II and III are correct
[B] Only I and II are correct
[C] Only I and III are correct
[D] Only II and III are correct



Question No:3

Which process of purification is represented by the following equation
Ti(impure) + 2I2 \(\xrightarrow{250&8451;} \(\xrightarrow{1400&8451;}Til4 Ti(pure) +2l2

[A] Cupellation
[B] poling
[C] Van Arkel
[D] Zone refining.



Question No:4

VanArkel method of purification of metals involves converting the metal to

[A] Volatile compound
[B] Volatile unstable compound
[C] Non-volatile stable compound
[D] None of these



Question No:5

Cupellation is used in the metallurgy of

[A] Cu
[B] Ag
[C] Al
[D] Fe



Question No:6

Copper is refined by

[A] Liquation
[B] c) Bessemerisation
[C] b) Cupellation
[D] Picking.



Question No:7

The phenomenon of removing layers of basic oxides from metals before electroplating is called

[A] Galvanising
[B] Anodising
[C] Poling
[D] Pickling



Question No:8

The process of zone refining is based upon

[A] Fractional crystalisation
[B] Fractional distillation
[C] Magnetic properties of impurites
[D] Impurities are less fusible than metals.



Question No:9

Zirconium and titanium are purified by

[A] Electrolysis
[B] c) Bessemerisation
[C] b) Zone refining
[D] Van-Arkel method



Question No:10

Ultrapure elements are obtained in the following method of metal refining

[A] Electrolysis
[B] Poling
[C] Liquation
[D] Distillation



Question No:11

The solubility of the impurities in the metal in molten and solid states is different. This is the principle involved in the refining of metal by following method

[A] Electrolysis
[B] Poling
[C] Liquation
[D] Distillation



Question No:12

The method used to refine copper metal is

[A] Liquation
[B] Distillation
[C] Zone refining
[D] electro lytic method



Question No:13

ASSERTION: In froth natation process sodium ethyl xanthate is used as collector
REASON: Sulphide ores are water soluble.

[A] If both ( and (R) are true and (R)isa correct explanation of the (
[B] If both (A) and (R) are true but (R) is a not correct explanation of the (A)
[C] If (A) is true but the (R) is false
[D] If (A) is false but the (R) is true



Question No:14

ASSERTION: Cassiterite (SnO2) is concentrated by magnetic separation method.
REASON: Cassiterite is a magnetic ore which contains non-magnetic impurities.

[A] If both ( and (R) are true and (R) is a correct explanation of the (
[B] If both (A) and (R) are true but (R)isa not correct explanation of the (A)
[C] If (A) is true but the (R) is false
[D] If (A) is false but the (R) is true



Question No:15

ASSERTION: Carbonate and oxide ores are concentrated by gravity separattion method
REASON: The principle of the method is based on the dfference in density of ores and matrix

[A] If both ( and (R) are true and (R) is a correct explanation of the (
[B] If both (A) and (R) are true but (R) is a not correct explanation of the (A)
[C] If (A) is true but the (R) is false
[D] If (A) is false but the (R) is true