Answer:
q1..no.2 and 4 are aromatic
Answer: Objects with like charge repel each other.
Solving part-1 only
#1
KMnO_4
- Transition metal is Manganese (Mn)
#2
Actually it's the oxidation number of Mn
Let's find how?




- x is the oxidation number
#3
- Purple as per the color of potassium permanganate
#4

Use a periodic table, It should help