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Hydrogen Iodide reducing agent? AS theory!

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It says in the book, that hydrogen Iodide is the least stable hydrogen halide. that makes sense, but it says that it can act as a strong reducing agent!? Can someone explain please?
Thank pou!
 
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HI has longer covalent bond than other hydrides in the group vII that we study...
So longer bond has requires less energy to dissassosiate ...
when HI dissociates it produces H+ as proton and the reduction is to lose a proton
and hence it is a good reducing agent...
 
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