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Please help with this chemistry question. Is it greater and greater? I've tried A,B and D...

Please help with this chemistry question. Is it greater and greater? I've tried A,B and D and they are all wrong.

In an aqueous solution that is acidic, [H3O+] is ________ than 1.0 x 10-7 and ________ than [OH-].

a) greater;less

b) less; greater

c) greater; greater

d) less;less

e) none of the above

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