(a) Strong (b) Weak (c) Strong (d) Weak (e) Weak (f) Weak (g) Strong (h) Weak (i) Weak
Work Step by Step
There are only a few strong acids: $HI, HBr, HClO_4, HCl, HClO_3, H_2SO_4$ and $HNO_3$. This can only be determined experimentally, therefore, there is no rule; you will need to know each of them. Any acid that doesn't belong to this list is a weak acid.