Why was group 18 named as noble gases?
Octet electron configuration
Minute quantity in atmosphere
Chemical inactivity
Preparation of xenon and krypton compounds
Lead is used as
Telephone wires
Additive to petrol
For making alloys
All of the above
Among the halogen acid, the weakest acid is
HF
HCl
HBr
HI
Which is the general electronic configuration of group 15 elements?
ns2 np3
ns2 np2
ns2 np4
ns2 np6
