Explain surface tension on the basis of molecular theory.

Surface tension is

Surface tension is due to

The number of bonding electron pairs in N_(2) on the basis of molecular orbital theory is

Unit of surface tension is

Is surface tension a vector ?

Name one material whose resistivity decreases with rise in temperature. Explain briefly on the basis of free electron theory why the resistivity decreases.

What is photoelectric effect? State t he result of photoelectric effect experiment that could not be explained on the basis of laws of classical physics. Explain this effect on the b asis of quantum theory of electromagnetic radiations.

Explain Charles.s law on the basis of the kinetic theory of matter.

Explain on the basis of molecular orbital diagram why O_2 should be paramagnetic.

In which classes, the polymers are classified on the basis of molecular forces ?