Question No:1

In roasting the ores are generally converted into

[A] Metal oxides
[B] Iron pyrites
[C] Copper glance
[D] None of these



Question No:2

Smelting is usually carried out in

[A] Blast furnace
[B] Open hearth furnace
[C] Muffle furnace
[D] Electric furnace.



Question No:3

Which of the following processes involves smelting?

[A] Zn₂O₃\( \xrightarrow{Heat} \)ZnO+CO₂b)
[B] Fe₂O₂+3C\( \xrightarrow{Heat} \)2Fe + 3CO
[C] ₂PbS + 3O₂+3C \( \xrightarrow{Heat} \)2PbO + 2SO₂
[D] Al₂O₃2H₂O\( \xrightarrow{Heat} \)>Al₂O₃+2H₂O.



Question No:4

In the extraction of iron from haematite, the charge used is haematite, coke and lime stone in the following weight ratio

[A] 1:01:01
[B] 8:4:1
[C] 8:1:4
[D] 1:4:8



Question No:5

In the blast furnace the reaction that occurs in the zone of heat absorption is

[A] CO₂+C->2CO
[B] Fe₂O₃ + 3CO —– -> 2Fe + 3CO₂
[C] C+O₂->CO₂
[D] FeO + SiO₂ ———> FeSiO₃



Question No:6

Pudding process is used in the manufacture of

[A] Wrought iron
[B] pig iron
[C] Steel
[D] Cast iron



Question No:7

Cast iron contains phosphorus as impurity. In Bessemerisation of this cast iron, the slag formed is

[A] FePO₄
[B] Ca₃(PO₄)₂
[C] MnPO₄
[D] Zn₃(PO₄)₂



Question No:8

The calcium phosphate slag is commercially known as

[A] Thomas slag
[B] Baeyer’s slag
[C] Wohler ‘s slag
[D] Matte



Question No:9

Which of the following is not a correct statement?

[A] White cast iron contains carbon in the form of Fe₃C graphite.
[B] Grey cast iron contain carbon in the form of graphite.
[C] The quality of steel produced in bessemer converter is very high
[D] The quality of steel produced in open hearth process can be checked from time to time



Question No:10

Which of the following statement is wrong

[A] The fibrous nature of wrought iron is due to the slag present in it.
[B] The loss of iron is bessemer process is due to the formation of FeSiO₃ slag.
[C] In Bessemer process carbon monoxide formed burns with blue flame at the mouth of the furnace
[D] In blast furnace Fe₂O₃ is reduced to iron mainly by coke.



Question No:11

In the extraction of copper the smelt formed in the blast furnace contains

[A] Cu₂S +little FeS
[B] Cu₂S +little FeO
[C] Cu₂O +little FeS
[D] Cu₂O +little FeO



Question No:12

The Cu₂O impurity present in blister copper is removed by

[A] liquation
[B] distillation
[C] poling
[D] zone refining



Question No:13

In bessemer converter Cu₂S is converted to blister copper by

[A] self reduction
[B] reduction with coke
[C] reduction with coal gas
[D] reduction with H₂ gas



Question No:14

The cathode used in the electrolytic cell during aluminium extraction is made of

[A] Aluminium
[B] Carbon lining
[C] Iron
[D] Steel



Question No:15

Method used to refine Aluminium metal is

[A] Baeyer ‘s method
[B] Hall’s method
[C] Serpeck’s method
[D] Hoope’s method