<span>Haemoglobin is a pure substance because it contains only one type of atom. </span>
Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.
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Answer:
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Answer: Dinitrogen pentoxide
Explanation: