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1
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
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
2
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
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
3
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
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
4
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements. One is labelled as Assertion A nd the other is labelled as Reason R.

Assertion A : Sharp glass edge becomes smooth on heating it upto its melting point.

Reason R : The viscosity of glass decreases on melting.

Choose the most appropriate answer from the options given below.
A
A is true but R is false
B
Both A and R are true but R is NOT the correct explanation of A.
C
A is false but R is true.
D
Both A and R are true and R is the correct explanation of A.
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