Give reasons:
i) Nitrogen exists as a diatomic molecule 
ii) Nitrogen cannot form a pentahalide 
iii) Aluminium does not dissolve in conc. `HNO_(3)` 

Though nitrogen exhibit +5 oxidiation state, it does not form pentahalide. Why?

Nitrogen exist diatomic molecule and phosphorus as P_(4). Why ?

Phosphorus forms five bonds due to sp^(3)d hydridisation but nitrogen does not form pentahalides due to :

State reason for the following : (i) Non-metals cannot displace hydrogen from the acids. (ii) Hydrogen is not a metal, yet it is placed in the activity series of metals. (iii) Aluminium is more reactive than iron, yet its corrosion is less than that of iron.

Give reasons : (i) Sodium metal is stored under kerosene oil. (ii) Inspite of being highly reactive, aluminium is still used for making utensils.

Name the metals which do not react with Conc. HNO_(3) give reason.

Explain the following terms (i) Nitrogen fixation (ii) Nitrification (iii) Denitrification

Explain the following terms (i) Nitrogen fixation (ii) Nitrification (iii) Denitrification

Name the major compound formed when phenol is (i) heated with zinc dust (ii) treated with conc. "HNO"_(3)