Which of the following compound can exist in aqueous solution? (i) \( \mathrm{Na}_{2} \mathrm{O}...

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Which of the following compound can exist in aqueous solution?
(i) \( \mathrm{Na}_{2} \mathrm{O} \)
(ii) \( \mathrm{Na}_{2} \mathrm{O}_{2} \)
(iii) \( \mathrm{KO}_{2} \)
(iv) \( \mathrm{K}_{2} \mathrm{CO}_{3} \)
(a) i, ii
(b) ii, iv
(c) i, ii, iii
(d) Only iii
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