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JEEMAIN-2016
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Q)
The main oxides formed on combustion of
L
i
,
N
a
and
K
in excess of air are, respectively :
(
1
)
L
i
2
O
,
N
a
2
O
a
n
d
K
O
2
(
2
)
L
i
O
2
,
N
a
2
O
2
a
n
d
K
2
O
(
3
)
L
i
2
O
2
,
N
a
2
O
2
a
n
d
K
O
2
(
4
)
L
i
2
O
,
N
a
2
O
2
a
n
d
K
O
2
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