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Byju's Answer
Standard X
Physics
Phase Change
Give the orde...
Question
Give the order of melting points:
N
a
O
,
M
g
O
,
A
l
2
O
3
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Solution
N
a
O
<
M
g
O
<
A
l
2
O
3
Ions have high charge i.e cation has greater positive charge and anion has greater negative charge have more covalent character. Greater the covalent character greater the melting point.
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Similar questions
Q.
Give the order of melting points:
K
C
l
,
C
u
C
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,
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Q.
Give the order of melting points:
C
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F
e
C
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Q.
The Gibbs energy for the decomposition of
A
l
2
O
3
at
500
o
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is as follows:
2
3
A
l
2
O
3
→
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A
l
+
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2
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Δ
r
G
=
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96
k
J
The voltage needed for the electrolytic reduction of aluminium oxide (
A
l
2
O
3
) at
500
o
C
is at least:
Q.
The Gibbs' energy for the decomposition of
A
l
2
O
3
at
500
o
C
is as follows:
2
3
A
l
2
O
3
→
4
3
A
l
+
O
2
;
Δ
r
G
=
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960
k
J
m
o
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−
1
The potential difference needed for the electrolytic reduction of aluminium oxide
(
A
l
2
O
3
)
at
500
o
C
is at least:
Q.
F
e
2
O
3
+
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l
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The above reaction is an example of a :
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