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1
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The addition of silica during the extraction of copper from its sulphide ore :-
A
converts copper sulphide into copper silicate
B
converts iron oxide into iron silicate
C
reduces copper sulphide into metallic copper
D
reduces the melting point of the reaction mixture
2
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The statement is incorrect about Ellingham diagram is
A
provides idea about the reaction rate.
B
provides idea about free energy change.
C
provides idea about changes in the phases during the reaction.
D
provides idea about reduction of metal oxide.
3
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Match List I with List II : (Both having metallurgical terms)

List - I List - II
(a) Concentration of Ag ore (i) Reverberatory furnace
(b) Blast furnace (ii) Pig iron
(c) Blister copper (iii) Leaching with dilute NaCN solution
(d) Froth floatation method (iv) Sulfide ores

Choose the correct answer from the options given below :
A
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
B
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
C
(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
D
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
4
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :
A
TiO2
B
Fe2O3
C
ZnO
D
SiO2
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