A) \[{{O}_{2}}\]
B) \[{{H}_{2}}O\]
C) \[{{O}^{-}}\]
D) \[{{O}^{2-}}\]
Correct Answer: D
Solution :
\[O{{H}^{-}}\to \underset{\text{Conjugate}\,\text{base}\,\text{of}\,O{{H}^{-}}}{\mathop{{{O}^{2-}}+{{H}^{+}}}}\,\]
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