1
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
2
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
In a molecule of pyrophosphoric acid, the number of P - OH, P = O and P - O - P bonds/moiety(ies) respectively are :
A
4, 2 and 0
B
4, 2 and 1
C
3, 3 and 3
D
2, 4 and 1
3
JEE Main 2020 (Online) 2nd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with H2 in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be :
A
Pb(NO3)2
B
(NH4)2Cr2O7
C
NH4NO2
D
NaN3
4
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The reaction of H3N3B3Cl3 (A) with LiBH4 in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to H3N3B3(Me)3. Compounds (B) and (C) respectively, are :
A
Borazine and MeBr
B
Diborane and MeMgBr
C
Boron nitride and MeBr
D
Borazine and MeMgBr
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