Solution of \( \mathrm{K}_{2} \mathrm{O} \) in water is basic, because it contains a significant...

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Solution of \( \mathrm{K}_{2} \mathrm{O} \) in water is basic, because it contains a significant concentration of :
(a) \( \mathrm{O}_{2}^{2-} \)
(b) \( \mathrm{O}_{2}^{-} \)
(c) \( \mathrm{OH}^{-} \)
(d) \( \mathrm{K}^{+} \)
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