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

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

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HCl can be oxidised to `Cl_2` by a number of oxidising agents such as `MnO_2 , KMnO_4 , K_2 Cr_2 O_7 ` etc.
`MnO_2 + 4HCl to MnCl_2 + Cl_2 + 2H_2 O`
`Cl_2 ` can be reduced to HCl by reaction of `H_2` in presence of diffused sunlight.
`H_2 + Cl_2 overset("Diffused sunlight")to 2HCl`
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