1
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The set having ions which are coloured and paramagnetic both is :
A
Cu2+, Cr3+, Sc+
B
Cu2+, Zn2+, Mn4+
C
Sc3+, V5+, Ti4+
D
Ni2+, Mn7+, Hg2+
2
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The oxide that shows magnetic property is :
A
MgO
B
SiO2
C
Mn3O4
D
Na2O
3
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II

List - I
List - II
(a) Chlorophyll (i) Ruthenium
(b) Vitamin-$${B_{12}}$$ (ii) Platinum
(c) Anticancer drug (iii) Cobalt
(d) Grubbs catalyst (iv) Magnesium


Choose the most appropriate answer from the options given below :
A
(a) - (iii), (b) - (ii), (c) - (iv), (d) - (i)
B
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
C
(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
D
(a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)
4
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The common positive oxidation states for an element with atomic number 24, are :
A
+1 and +3
B
+2 to +6
C
+1 to +6
D
+1 and +3 to +6
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