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Ellingham diagrams and thermodynamics of reduction
JEE Main level
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Difficulty 2 of 3
mt209
Which of the following statements about the Ellingham diagram are correct?
A
The line for
C
+
O
X
2
CO
X
2
is nearly horizontal
B
All metal-oxide lines slope downward with temperature
C
The line for
2
C
+
O
X
2
2
CO
slopes downward
D
The line for
2
CO
+
O
X
2
2
CO
X
2
slopes upward
Answer: A, C, D
The CO line has
Δ
S
∘
>
0
(down); the
CO
X
2
line has
Δ
S
∘
≈
0
;
2
CO
+
O
X
2
2
CO
X
2
loses three moles of gas to two so
Δ
S
∘
<
0
(up). Metal oxide lines slope upward.
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