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Which is the strongest acid in the following?

1. HClO3
2. HClO4
3. H2SO3
4. H2SO4

Correct answer: HClO4

Solution

HClO4 (perchloric acid) is the strongest acid among the given options because it is a superacid with complete dissociation in water, making it stronger than HClO3, H2SO3, and H2SO4.

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