1
There is only one such plane.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
None.
only 1
3
Your question lacks context. However, it is possible to label a point as point E on any plane you like. The letter is freely available.
1
1
There is only one such plane.
1
Infinitely many.
Infinitely many.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
one
None.
exactly 1