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Question
Chemistry
The main oxides formed on combustion of Li, Na and K in excess of air are, respectively :
Q. The main oxides formed on combustion of
L
i
,
N
a
and
K
in excess of air are, respectively :
3421
200
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JEE Main 2016
The s-Block Elements
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A
L
i
2
O
,
N
a
2
O
and
K
O
2
17%
B
L
i
O
2
,
N
a
2
O
2
and
K
2
O
35%
C
L
i
2
O
,
N
a
2
O
2
and
K
O
2
22%
D
L
i
2
O
,
N
a
2
O
and
K
O
2
26%
Solution:
The main oxides formed on combustion of
L
i
,
N
a
and
K
in excess of air are, respectively
L
i
2
O
,
N
a
2
O
2
and
K
O
2
.
Under ordinary conditions, lithium forms the monoxide, sodium forms the peroxide and other alkali metals form superoxide.