This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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)
2
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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
3
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Sulphide ion is soft base and its ores are common for metals.

(a) Pb (b) Al (c) Ag (d) Mg
A
(a) and (c) only
B
(a) and (d) only
C
(a) and (b) only
D
(c) and (d) only
4
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Consider two chemical reactions (A) and (B) that take place during metallurgical process:

(A) $$ZnC{O_{3(s)}}\buildrel \Delta \over \longrightarrow Zn{O_{(s)}} + C{O_{2(g)}}$$

(B) $$2Zn{S_{(s)}} + 3{O_{2(g)}}\buildrel \Delta \over \longrightarrow 2Zn{O_{(s)}} + 2S{O_{2(g)}}$$

The correct option of names given to them respectively is :
A
(A) is calcination and (B) is roasting
B
Both (A) and (B) are producing same product so both are roasting
C
Both (A) and (B) are producing same product so both are calcination
D
(A) is roasting and (B) is calcination
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