WHEN ONE OF THE SPHERE OF RADII HAVING CHARGE 'Q' COME IN CONTACT WITH OTHER SPHERE OF SAME RADII THEIR CHARGE GETS EQUALLY DISTRIBUTED THEN WHAT WILL HAPPEN IF THEY ARE NOT OF EQUAL RADII?

The charge flows untill the potential on both become equal. As they both had same radius 

 

V= k q/r     so they both will have same amount of charge.

 

If they both have different radii they will have differet amount of charge.