Question

Four species are listed below :
(i)$HC{O}_3^{-}$ (ii) $H_3{O}^{+}$ (iii) $HS{O}_4^{-}$ (iv) $HS{O}_{3}F$.
Which one of the following is the correct sequence of their acid strength?

• A. ii < iii < i < iv
• B. i < iii < ii < iv
• C. iii < i < iv < ii
• D. iv < ii < iii < i

Answer 1

The correct option is A ii < iii < i < iv

Acidic nature $\propto$ More negative charge on cemtral atom

$H_3{O}^{+}<HS{O}_4^{-}<HC{O}_3^{-}<HS{O}_{3}F$