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1
JEE Main 2022 (Online) 24th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which one of the following elemental forms is not present in the enamel of the teeth?

A
Ca2+
B
P3+
C
F$$-$$
D
P5+
2
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The oxide without nitrogen-nitrogen bond is :
A
N2O
B
N2O4
C
N2O3
D
N2O5
3
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which one of the following correctly represents the order of stability of oxides, X2O; (X = halogen)?
A
Br > Cl > I
B
Br > I > Cl
C
Cl > I > Br
D
I > Cl > Br
4
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The number of S = O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :
A
2, 3 and 4
B
1, 4 and 3
C
2, 4 and 3
D
1, 4 and 4
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