<Tr> <Td> Hydroxide </Td> <Td> OH − </Td> </Tr> <Tr> <Td> Nitrite </Td> <Td> NO − </Td> </Tr> <Tr> <Td> Nitrate </Td> <Td> NO − </Td> </Tr> <Tr> <Td> Peroxide </Td> <Td> O2 − </Td> </Tr>

Which ion is an example of an anion