Question

Which of the following has no conjugate base?

• A. Oxide ion
• B. Hydroxide ion
• C. Hydrogen peroxide ion
• D. Hydrogen sulphate ion

Answer 1

The correct option is A Oxide ion

For conjugate base, there should be a ionisable H atom
$A\to O^{2-}\to$ No ionisable H
$B\to O{H}^{-}\to$ ionisable H present
$C\to H{O}_{2-}^{-}\to$ ionisable H present
$D\to HS{O}_4^{-}\to$ ionisable H present
$\therefore$ Answer A]