The Student Room Group

Could someone please tell me what reaction these molecules are involved in?

thiosulphate
persulfate
KI
Fe (both oxidations)
and starch as an indicator

This is a list and my class has been asked to do some research about the reactions of these compounds. I have almost no idea. I found iodine clock test which involves everything but Fe. Any ideas? Thanks.
Reply 1
Only one of them is a molecule.

Also, iron ions happily will act as a catalyst for the iodine clock reaction.

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