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Standard VIII
Chemistry
Chemical Properties of Non-Metals
, Na K on...
Question
, Na & K on heating in excess of air form oxide respectively :- (1) Li2O, Na2O2 & KO2 (2) LiO2, Na2O2 & K2O (3) Li2O, N2O & K2O (4) Li2O2, Na2O2 & K2O2
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Q.
The main oxides formed on the combustion of
L
i
,
N
a
and
K
in excess of air are, respectively:
Q.
Number of paramagnetic oxides among the following given oxides is ____
L
i
2
O
,
C
a
O
,
N
a
2
O
2
,
K
O
2
,
M
g
O
and
K
2
O
Q.
Which is not correctly matched?
(1) Basic strength of oxides.
C
s
2
O
<
R
b
2
O
<
K
2
O
<
N
a
2
O
<
L
i
2
O
(2) Stability of peroxides.
N
a
2
O
2
<
K
2
O
2
<
R
b
2
O
2
<
C
s
2
O
2
(3) Stability of bicarbonates.
L
i
H
C
O
3
<
N
a
H
C
O
3
<
K
H
C
O
3
<
R
b
H
C
O
3
<
C
s
H
C
O
3
(4) Melting point.
N
a
F
<
N
a
C
l
<
N
a
B
r
<
N
a
l
Q.
Which of the following is(are) not correctly matched?
(1) Basic strength of oxides:
C
s
2
O
<
R
b
2
O
<
K
2
O
<
N
a
2
O
<
L
i
2
O
(2) Stability of peroxides:
N
a
2
O
2
<
K
2
O
2
<
R
b
2
O
2
<
C
s
2
O
2
(3) Stability of bicarbonates:
L
i
H
C
O
3
<
N
a
H
C
O
3
<
K
H
C
O
3
<
R
b
H
C
O
3
<
C
s
H
C
O
3
(4) Melting point:
N
a
F
<
N
a
C
l
<
N
a
B
r
<
N
a
I
Q.
Oxidation number of potassium in
K
2
O
,
K
2
O
2
,
K
O
2
respectively, are :
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