Hydrogen selenium Ozone
Selenic acid it is not. It is missing an ion. According to a PDF document, it is used in synthetic sodium componds.
The chemical name is hydrogen selenite.
The chemical name is hydrogen selenite.
Al(HSeO3)3
The Se (selenium) would be sp3d hybridized.
The correct formula is H2Se. Because it is an acid, hydrogen needs to be at the beginning. Hydrogen has an ionization of +1 and selenium (from which you get selenic) has -2, so you'll need 2 atoms of hydrogen (H) to balance out 1 atom of selenium (Se). So you'll have H2Se.
The conjugate base of H2CO3 is HCO3-. Nope, itsHSO3-