Question

(a) Explain why carbon forms covalent bond ? give two reasons for carbon forming a large number of compounds.
(b) explain the formation of Ammonia molecules

Answer 1

(a) carbon has valency 4 so it is very difficult for its nucleus to gain four electrons from any other elements and it very difficult to loss all the 4 electrons from its outermost shall as it required a very high amounts of energy.

(b) Formation of ammonia (NH3) by reaction of Nitrogen (N2) and Hydrogen (H2) is a reversible reaction. It occurs at a definite pressure and temperature (2000 atm and 450℃) under a catalyst (iron). ... For a gaseous reaction, N2 + 3H2 gives 2NH3.

Answer 2

a) Carbon forms covalent bond as it has the propert of catenation and it can form long chain compound of itself.

b) In ammonia Nitrogen gains 3 electrons from hydrogen and hydrogen shares it with nitrogen to complete their octet