Which of the following is not a peroxide ? (a) \( \mathrm{Na}_{2} \mathrm{O}_{2} \) (b) \( \math...

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Which of the following is not a peroxide ?
(a) \( \mathrm{Na}_{2} \mathrm{O}_{2} \)
(b) \( \mathrm{CaO}_{2} \)
PD
(c) \( \mathrm{PbO}_{2} \)
(d) \( \mathrm{H}_{2} \mathrm{O}_{2} \)
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