Four species are listed below
i. HCO3⁻
ii. H₃O⁺
iii. HSO₄⁻
iv. HSO₃F
Which one of the following is the correct sequence of their acid strength?

iv < ii < iii < i

ii < iii < i < iv

i < iii < ii < iv

iii < i < iv < ii

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Solution

i < iii < ii < iv