Which of the following is used as a source of oxygen in space capsu...

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Which of the following is used as a source of oxygen in space capsules, submarines and breathing masks?
(a) \( \mathrm{Li}_{2} \mathrm{O} \)
(b) \( \mathrm{Na}_{2} \mathrm{O}_{2} \)
(c) \( \mathrm{KO}_{2} \)
(d) \( \mathrm{K}_{2} \mathrm{O}_{2} \)
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