The oxoacid of sulphur which contains two sulphur atoms in different oxidation states is

The potential energy of a diatomic molecule is given by $U = \frac{A}{r^{12}} - \frac{B}{r^6}$,where $A$ and $B$ are positive constants. The distance $r$ between them at equilibrium is:

In the electrolytic extraction of $Al$,molten cryolite is used because it .......

Which of the following is not a conjugate acid-base pair?

Which of the following does not exist?