Answer
a. Strong
b. Weak
c. Strong
d. Weak
Work Step by Step
The strong acids are as follows:
$HCl, HBr, HI, HNO_3, HClO_4, H_2SO_4$.
The formulas for the pictures of the acids are as follows:
a. $HClO_4$, Strong
b. $HOCl$, Weak
c. $H_2SO_4$, Strong
d. $H_2SO_3$, Weak