What is the name of the process in which reducing chemical such as sulphur dioxode $(S O_{2})$ , sodium trisulphite $(N a H S O_{3})$ and sodium sulphit $(N a_{2} S O_{3})$ is added to remove unwanted residual of chlorine from water?

- 1
  
  Chlorination
- 2
  
  Hydrogenation
- 3
  
  Dechlorination
- 4
  
  Sulphurification

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