Why does the magnitude of London forces increase with the increasing size of the atoms and molecules?

Why does the speed of sound increase with increase in temperature?

Why does the value of bond angle increase with increase in electronegativity of the central atom in AB_(2) type of molecule?

Why does the velocity of gas molecules increase with increase in temperature ?

Why does the vapour pressure of a liquid increase with the increase in temperature?

The strength of dispersion forces does not increases with increases in

Why does the resistivity of metal increase with an increase in temperature ?