Answer
$H_{2}CO_{3}$( aq ) is carbonic acid.
Work Step by Step
Oxyacids with oxanions ending in -ate are named as : $ 'base name \hspace{1mm}of \hspace{1mm}oxyanion' + ic + acid$
The base name of oxyanion $CO_{3}^{2-}$ (carbonate) is $carbon$ , so $H_{2}CO_{3}$( aq ) is carbonic acid.