H2O2, hydrogen peroxide is a funny looking molecule: It has two oxygen atoms in the centre, and they end up single-bonded. Then, there is a Hydrogen Atom at each end. It's just like a water molecule, but with one extra oxygen in the middle.
All of these bonds are covalent, because both hydrogen and oxygen are non-metals, but the O-O bond is non-polar and the O-H bonds are polar. In fact, significant hydrogen bonding exists between molecules of hydrogen peroxide.
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