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How can you prepare Cl2 from HCl and HCI...

How can you prepare `Cl_2` from HCl and HCI from `Cl_2`? Write reactions only.

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`Cl_2` can be preapared from HCl by Decon's process.
`4HCl +O_2 overset(CuCl_2)rarr 2Cl_2+2H_2O`
(ii) HCl can be prepared from `Cl_2` on trating it with water.
`underset("Hydrochloric acid ")(Cl_2H_2O)rarrunderset("Hypochlorous acid ")(HCl+HOCl)`
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