The Sun DOES rotate.
See related question.
The Kuiper belt is not an object; it is a region of the solar system. Therefore it does not have an axis of rotation
The Earth, like every object in our Solar system is tied down by the huge gravity pull between the Sun and the object.
As far as we know it is not possible for a planet not to rotate, they all rotate because they have some form of gravity within them that gets them turning, perhaps you are thinking of Venus which turns in the opposite direction to all the other planets in our Solar System.
none
If the object is gravitationally bound to the sun, it is part of the solar system. If not, not.
The biggest object in the solar system is the sun, and the smallest is Pluto
The electrons typically rotate around the nucleus in the solar system model.
The solar system is the smallest
Yes, all the planets in our solar system revolve and rotate.
the sun
Yes, they all do.
The largest object in the solar system is not a planet. It is the Sun. The largest planet is Jupiter.