That's nice, but u haven't solved question 2 and the answer to question 1i is 3/2 not 3/3

Side length $s = 2a$.
Area $A = s^2 = (2a)^2 = 4a^2$.
The centroid of the square is its geometric center.

The distance of the centroid from the axis of rotation is $d = 3a$.
The volume $V$ is given by $V = 2\pi d A$.

The volume of the solid swept out by the square is $\boxed{24\pi a^3}$.

Perimeter $P = 4s = 4(2a) = 8a$.
The centroid of the perimeter is its geometric center.

The distance of the centroid from the axis of rotation is $d = 3a$.
The surface area $S$ is given by $S = 2\pi d P$.

The area of the surface of the solid is $\boxed{48\pi a^2}$.