Arrange the following in the decreasing order of their reducing character.
HF, HCl, HBr, HI.

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Solution

The decreasing order of the reducing character is $H I > H B r > H C l > H F$
The stability of hydrogen halides decreases on moving from HF to HI, the reducing property increases on moving down the group. Thus, HI is the strongest reducing agent and HF is not a reducing agent.

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