1.

Which of the following is used to prepare CI_(2) gas at room temperature from concentrated HCI?

Answer»

`MnO_(2)`
`H_(2)S`
`KMnO_(4)`
`Cr_(2)O_(3)`

Solution :`KMnO_4` oxidises halogen ACIDS to halogen.
`2K MnO_(4) + 3H_2SO_4 to K_2SO_4 + 2 MnSO_4 + 3H_2O + 5O`
`[2HCl + O to H_2O + Cl_2] xx 5`
`2KMnO_4 + 3H_2SO_4 + 10 HCl to K_2SO_4 + 2MnSO_4 + 8H_2O + 5Cl_2`.
`:. KMnO_4` is USED to prepare `Cl_2` from concentrated HCl.


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