(a) $Rb$
(b) $K$
(c) $Li$
(d) $Na$
[2012]
Correct Answer: 39.(c)
Solution:
(c) All the alkali metals when heated with oxygen form different types of oxides for example lithium forms lithium oxide $(Li_2 O)$, sodium forms sodium peroxide $(Na_2 O_2)$, while $K, Rb$ and $Cs$ form their respective superoxides.
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