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Which of the following is the stronger acid? (b) H 2 Cr O 4 or HMn...

Which of the following is the stronger acid?

(b) H 2 Cr O 4 or HMn O 4 . I thought for H2CrO4, H has an oxidation number of -1 and oxygen has an oxidation number of -2 and then if these numbers are equal to 0 and you get +10. For HMnO4, I got that the oxidation number for Mn is +9. I know this is wrong. How is the oxidation number for Cr +6 when looking at H2CrO4? And how is the the oxidation number for Mn 7+? Please explain step by step.

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