if we say binary ionic compound it should be composed of ions of two different elements - one of which is a metal, and the other a nonmetal. Looking at the formula it shows that it does not have a metallic element involved.and it has a polyatomic ion so the bond between them is covalent bond.
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HCO3 is not a binary ionic compound because
if we say binary ionic compound it should be composed of ions of two different elements - one of which is a metal, and the other a nonmetal. Looking at the formula it shows that it does not have a metallic element involved.and it has a polyatomic ion so the bond between them is covalent bond.