Which one of the following is present as an active ingredient in bleaching powder for bleaching action?

Which one of the following is present as an active ingredient in bleaching powder for bleacing action?

Bleaching powder is

Bleaching powder is

Bleaching powder is

Which of the following ion(s) is/are present as an active ingredient in bleaching powder (CaOCL_2) , for bleaching action?

Name the following: The real bleaching agent present in bleaching powder.