Why was group 18 named as noble gases?
Octet electron configuration
Minute quantity in atmosphere
Chemical inactivity
Preparation of xenon and krypton compounds
The most abundant element of group 15 is
Nitrogen
Antimony
Phosphorous
None of these
The electrolyte in electrolytic refining of Pb is
Lead fluosilicate
Hydrofluosilicic Acid
Both a and b
Which is a relatively rare element in earth’s crust among the following?
Thallium
Indium
Boron
Gallium
Why was group 18 named as inert gases?
minute quantity in atmosphere
chemical inactivity
both a and b
none of these
