Which of the following ions can exist?

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(D) The ion $H_5O_2^+$ is a hydrated proton, $[H_3O^+ \cdot H_2O]$, which exists in acidic solutions.
$H_3O_2^-$ is a hydrated hydroxide ion, $[OH^-

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(D) The ion $H_5O_2^+$ is a hydrated proton, $[H_3O^+ \cdot H_2O]$, which exists in acidic solutions.
$H_3O_2^-$ is a hydrated hydroxide ion, $[OH^- \cdot H_2O]$, which exists in basic solutions.
$HF_2^-$ is a well-known bifluoride ion formed by strong hydrogen bonding between $F^-$ and $HF$.
Since all these ions are stable under appropriate conditions, the correct answer is $D$.

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