Which is the strongest acid?Why?

HI, HF HCl HBr

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Solution

HCl is the strongest acid!
The more easily an acid can dissociate into H+ ions, the more stronger it is.

The size of Cl- ion being larger than F- ion, the HCl bond is weaker than HF bond.

So it can break(dissociate) more easily and liberate H+ ions easily and hence is a stronger acid.
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