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To classify each of the given acids as strong or weak:
1. **HBr (Hydrobromic acid)**: Strong acid. HBr completely ionizes in water.
2. **HClO2 (Chlorous acid)**: Weak acid. HClO2 does not completely ionize in water.
3. **HIO2 (Iodous acid)**: Weak acid. Similar to HClO2, HIO2 does not fully ionize in water.
So the classifications are:
- HBr: Strong
- HClO2: Weak
- HIO2: Weak