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Metallurgy Mock Test-12

Question No:1

Aluminium is extracted from alumina (Al2O3 ) by electrolysis of a molten mixture of

[A] Al2O3+HF+NaAIF4
[B] Al2O3+CaF2+NaAIF4
[C] Al2O3 +Na3 AIF6 +CaF2 d
[D] Al2O3+KF+Na3AIF6



Question No:2

Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acideic acts as a reducing agent and its acid has never been insolated. The gas X is

[A] H2S
[B] SO2
[C] CO2
[D] SO3



Question No:3

In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with

[A] iron II sulphide
[B] carbon monoxide
[C] copper I sulphide
[D] sulphur dioxide



Question No:4

Match items of Column I with the items of Column II and assign the correct code.
Column I

(A) Cyanide process
(B) Froth floatation process
(C) Electrolytic reduction
(D) Zone refining
Column II

(1) Ultrapure Ge
(2) Dressing of ZnS
(3) Extraction of Al
(4) Extraction of Au
(5) Purification of Ni
Codes
a b c d

[A] 2 3 1 5
[B] 1 2 3 4
[C] 3 4 5 1
[D] 4 2 3 1



Question No:5

Extraction of gold and silver involves leaching with CN ion. Silver is later recovered by

[A] liquation
[B] distillation
[C] zone refining
[D] displacement withZn



Question No:6

In the extraction of copper from sulphide ore the ratal is formed by reduction of Cu2O with

[A] FeS
[B] CO
[C] Cu2S
[D] SO 2



Question No:7

Which of the following is a carbonate ore ?

[A] Pyrolusite
[B] Malachite
[C] diaspore
[D] Cassiterite



Question No:8

Carbon and CO gas are used to reduce which of the following pairs of metal oxides for extraction of metals ?

[A] FeO, SnO
[B] SnO, ZnO
[C] BaO,Na2O2
[D] FeO, ZnO



Question No:9

What is the rode of aniline or cresol when added in a froth floatation process?

[A] Stabilizer
[B] Depressant
[C] Wetting agent
[D] All of these



Question No:10

Slag formed in blast furnace, removes the impurity of

[A] SiO 2
[B] CaO
[C] CO 2
[D] FeO



Question No:11

Which of the following is not the correct match?

[A] Leaching– Ag
[B] Zone refining– Sn
[C] Liquation—- Pb
[D] van Arkel —Z



Question No:12

The composition of carnallite is

[A] KCl-MgCl2-6H2O
[B] Na2Al2O3
[C] Fe3O4
[D] Na3AlF6



Question No:13

Oil used as frothing agent in forth-floatation process is

[A] pine oil
[B] mustard oil
[C] coconut oil
[D] olive oil



Question No:14

2CuFeS2 + O2—> Cu2S + 2FeS + SO2
Which process of metallurgy of copper is represented by above equation?

[A] Concentration
[B] Roasting
[C] Reduction
[D] Purification



Question No:15

Assertion : Extraction of iron metal from iron oxide ore is carried out by heating with coke only.
Reason : The reaction Fe2O3 (s) —–> Fe (s) + 3/2O2 (g) is a spontaneous process.

[A] If both assertion and reason are true and reason is the correct explanation of assertion.
[B] If both assertion and reason are true but reason is not the correct explanation of assertion.
[C] If assertion is true but reason is false.
[D] If both assertion and reason are false.



Question No:16

Assertion : Magnesium is extracted by the electrolysis of fused mixtrue of MgCl2, NaCl andCaCl2
Reason : Calcium chloride acts as a reducing agent.

[A] If both assertion and reason are true and reason is the correct explanation of assertion.
[B] If both assertion and reason are true but reason is not the correct explanation of assertion.
[C] If assertion is true but reason is false.
[D] If both assertion and reason are false.



Question No:17

Assertion : Coke and flux are used in smelting.
Reason : The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.

[A] If both assertion and reason are true and reason is the correct explanation of assertion.
[B] If both assertion and reason are true but reason is not the correct explanation of assertion.
[C] If assertion is true but reason is false.
[D] If both assertion and reason are false.



Question No:18

Assertion : Fe+3 is not valid for Brown Ring Test.
Reason : Because NO2 first convert into NO2

[A] If both assertion and reason are true and reason is the correct explanation of assertion.
[B] If both assertion and reason are true but reason is not the correct explanation of assertion.
[C] If assertion is true but reason is false.
[D] If both assertion and reason are false