1
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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
2
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A solution is 0.1 M in Cl$$-$$ and 0.001 M in CrO$$_4^{2 - }$$. Solid AgNO3 is gradually added to it. Assuming that the addition does not change in volume and Ksp(AgCl) = 1.7 $$\times$$ 10$$-$$10 M2 and Ksp(Ag2CrO4) = 1.9 $$\times$$ 10$$-$$12 M3.

Select correct statement from the following :
A
AgCl precipitates first because its Ksp is high.
B
Ag2CrO4 precipitates first as its Ksp is low.
C
Ag2CrO4 precipitates first because the amount of Ag+ needed is low.
D
AgCl will precipitate first as the amount of Ag+ needed to precipitate is low.
3
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Outermost electronic configuration of a group 13 element, E, is 4s2, 4p1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is :
A
[Kr] 3d10 4s2 4p2
B
[Ar] 3d10 4s2 4p2
C
[Xe] 5d10 6s2 6p2
D
[Kr] 4d10 5s2 5p2
4
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Metallic sodium does not react normally with :
A
gaseous ammonia
B
But-2-yne
C
Ethyne
D
tert-butyl alcohol
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