The Sblock Elements Ques 39
39. Which one of the alkali metals, forms only, the normal oxide, $M_2 O$ on heating in air?
(a) $Rb$
(b) $K$
(c) $Li$
(d) $Na$
[2012]
Show Answer
Answer:
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.
BETA
