Answer
a) $CO_2+H_2O\rightarrow H_2CO_3$ - carbonic acid
b) $SO_3+H_2O\rightarrow H_2SO_4$ - sulfuric acid
c) $SeO_3+H_2O\rightarrow H_2SeO_4$ - selenic acid
d) $N_2O_5+H_2O\rightarrow 2HNO_3$ - nitric acid
e) $Cl_2O_7+H_2O\rightarrow 2HClO_4$ - perchloric acid
Work Step by Step
a) $CO_2+H_2O\rightarrow H_2CO_3$ - carbonic acid
b) $SO_3+H_2O\rightarrow H_2SO_4$ - sulfuric acid
c) $SeO_3+H_2O\rightarrow H_2SeO_4$ - selenic acid
d) $N_2O_5+H_2O\rightarrow 2HNO_3$ - nitric acid
e) $Cl_2O_7+H_2O\rightarrow 2HClO_4$ - perchloric acid