(C) The structure of $H_2SO_4$ is $H-O-S(=O)_2-O-H$. In this structure,the $S-O$ bonds formed by sharing electrons are covalent,and the two $S=O$ bond

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Covalent and coordinate covalent bonds

(C) The structure of $H_2SO_4$ is $H-O-S(=O)_2-O-H$. In this structure,the $S-O$ bonds formed by sharing electrons are covalent,and the two $S=O$ bonds are coordinate covalent bonds (dative bonds) where sulfur donates a lone pair to oxygen. Thus,the molecule contains both covalent and coordinate covalent bonds.