1
JEE Main 2022 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The total number of $$\mathrm{Mn}=\mathrm{O}$$ bonds in $$\mathrm{Mn}_{2} \mathrm{O}_{7}$$ is __________.

A
4
B
5
C
6
D
3
2
JEE Main 2022 (Online) 26th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The dark purple colour of $$\mathrm{KMnO}_{4}$$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :

A
5
B
1
C
7
D
2
3
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The electronic configuration of Pt (atomic number 78) is :

A
[Xe] 4f14 5d9 6s1
B
[Kr] 4f14 5d10
C
[Xe] 4f14 5d10
D
[Xe] 4f14 5d8 6s2
4
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which one of the lanthanoids given below is the most stable in divalent form?

A
Ce (Atomic Number 58)
B
Sm (Atomic number 62)
C
Eu (Atomic Number 63)
D
Yb (Atomic Number 70)
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