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HI can be prepared by all the following ...

`HI` can be prepared by all the following methods except

A

`PI_3 +H_2O`

B

`KI + H_2SO_4`

C

`H_2 + I_2 overset(Pt)to`

D

`I_2 + H_2S`

Text Solution

Verified by Experts

The correct Answer is:
B
`H_2 + I_2 overset(Pt)to2HI`
`I_2 + H_2S to 2HI +S`
`PI_3 + 3H_2O to H_3PO_3 + 3HI`
HI cannot be prepared from KI and `H_2SO_4` because conc. `H_2SO_4` oxidises the HI produce to `I_2`.
`({:(KI+H_2SO_4 to, KHSO_4 +HI"]"xx2),(H_2SO_4 to, H_2O +SO_2 +O),(2HI+O to,H_2O + I_2):})/ul(2KI +3H_2SO_4 to 2KHSO_4 +2H_2O +SO_2 +I_2)`
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