Natural rubber is the polymer of:
Which of the inert gases can form compounds?
The mass number of a nucleus is
The chiefsource for the production of nitrogeneous fertilizers is :Â
Urea is a —
In addition to hydrogen the other abundant element present on Sunsurface is
Ozone layer is present in
Alcoholic (OH) group can be identified by
The chemical bahaviour of an atom depends uponÂ
Which one of the following contributes largely to the greenhouse effect?