which of these 2 ions have a similar shape?

Question

a. SO32- and PO33-
b. PO33- and NO3-
c. CO32- and PO33-
d. OH- and SO32-
e. CO32- and SO32-

Answer 1

Hmmm - looks like maybe b or e at first glance. Let me check.

Not e

C and S are in different periods

so probably b

Answer 2

A SO32- and PO33-

They both have a triangular based pyramid shape due to the presence of one lone pair and three bond pairs (Note that there is a double bond in SO32- but since one is a pi and one is a sigma bond, the sigma is ignores as it follows the pi bond).