The bond present between a hydrogen atom and an oxygen atom is single covalent bond. Oxygen and hydrogen share an electron pair to complete their outer most shell. The electronegativity of hydrogen is 2.1 and electronegativity of oxygen is 3.5. The electronegativity difference between two atoms is 1.4 so, the molecule which is formed is a polar molecule. Oxygen atom has greater electronegativity and hydrogen atom has less electronegativity so, hydrogen gets partial positive charge and oxygen atom gets partial negative charge.
