<P> Examples of covalently bonded chlorides are phosphorus trichloride, phosphorus pentachloride, and thionyl chloride, all three of which are reactive chlorinating reagents that have been used in a laboratory . </P> <P> Chlorine can assume oxidation states of − 1, + 1, + 3, + 5, or + 7 . Several neutral chlorine oxides are also known . </P> <Table> <Tr> <Th> Chlorine oxidation state </Th> <Td> − 1 </Td> <Td> + 1 </Td> <Td> + 3 </Td> <Td> + 5 </Td> <Td> + 7 </Td> </Tr> <Tr> <Th> Name </Th> <Td> chloride </Td> <Td> hypochlorite </Td> <Td> chlorite </Td> <Td> chlorate </Td> <Td> perchlorate </Td> </Tr> <Tr> <Th> Formula </Th> <Td> Cl </Td> <Td> ClO </Td> <Td> ClO </Td> <Td> ClO </Td> <Td> ClO </Td> </Tr> <Tr> <Th> Structure </Th> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Chlorine oxidation state </Th> <Td> − 1 </Td> <Td> + 1 </Td> <Td> + 3 </Td> <Td> + 5 </Td> <Td> + 7 </Td> </Tr>

Which substance can be used as an indicator for chloride