1
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Boron and silicon of very high purity can be obtained through :
A
Liquation
B
Electrolytic refining
C
Zone refining
D
Vapour phase refining
2
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Reaction of ammonia with excess Cl2 gives :
A
NH4Cl and N2
B
NH4Cl and HCl
C
NCl3 and HCl
D
NCl3 and NH4Cl
3
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid (C) is :
A
+3
B
+4
C
+5
D
+2
4
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :
A
N2O3
B
N2
C
N2O5
D
NO
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