What is the valency of Nitrogen in NO2?
4
2
3
1
Let x be the valency of Nitrogen.
∵ Valency of Oxygen is 2 and Number of atoms in Oxygen is 2
∴ x + 2*(-2) = 0
∴ x = 4
If HCF (a, b) × LCM (a, b) = 84 and b = 21 then a = ?
If tan1∘tan2∘.............tan89∘=x2−8,then the value of x can be