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Which of the following acid is weakest ?

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Which of the following acid is weakest ?
A. HClO
B. HBr
C. `HClO_3`
D. HCl
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Correct Answer - D
Out of `HClO_3`, HClO and HCl, HCl is the weakest (lowest oxidation state). Out of HBr and HCl, HBr is stronger. Therefore, weakest acid is HCl.
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