1
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Number of paramagnetic oxides among the following given oxides is ____________.

Li2O, CaO, Na2O2, KO2, MgO and K2O
A
1
B
2
C
3
D
0
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II :

JEE Main 2021 (Online) 27th August Morning Shift Chemistry - Chemical Bonding & Molecular Structure Question 55 English
Choose the most appropriate answer from the options given below :
A
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
B
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
C
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
D
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Match items of List-I with those of List-II :

List - I
(Property)
List - II
(Example)
(a) Diamagnetism (i) MnO
(b) Ferrimagnetism (ii) $${O_2}$$
(c) Paramagnetism (iii) NaCl
(d) Antiferromagnetism (iv) $$F{e_3}{O_4}$$


Choose the most appropriate answer from the options given below :
A
(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
B
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
C
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
D
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
4
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
The bond order and magnetic behaviour of $$O_2^ - $$ ion are respectively :
A
1.5 and paramagnetic
B
1.5 and diamagnetic
C
2 and diamagnetic
D
1 and paramagnetic
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