problem1) Answer all the problems:

i) Describe structure of biborance B2H6, and types of bond present.

ii) Describe the composition of fresh air and give the detail of main air polluting gases.

iii) describe Pearson’s HSAB concept?

iv) Describe silicons with the structure of three silicons.

v) Give two preparation methods of Aryl halides.

problem2) describe paramagnatism, diamagnetism, ferromagnetism and antiferromagnetism with appropriate diagrams and exs.

problem3) prepare down the formulae for the mononuclear carbonycs formed by V, Cr, Fe and Ni.

problem4) prepare brief notes on the following :

(a) Radioactive pollution and exs from 20th century radioactive pollution in world.

(b) Soil pollution and effect on agriculture.