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BITSAT 2020 Paper
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Section:
Chemistry
© examsiri.com
Question :
79 of 150
Marks:
+1
,
-0
Δ
f
G
−
vs
T
plot in the Ellingham diagram slopes downward for the reaction
M
g
+
1
2
O
2
→
M
g
O
2
A
g
+
1
2
O
2
→
A
g
2
O
C
+
1
2
O
2
→
C
O
C
O
+
1
2
O
2
→
C
O
2
Validate
Solution:
C
(
s
)
+
1
2
O
2
(
g
)
→
C
O
(
g
)
;
Δ
S
increases.
Hence, as the temperature increases,
T
Δ
S
increases and hence
Δ
G
(
Δ
H
−
T
Δ
S
)
decreases. In other words, the slope of the curve for formation of CO decreases. However, for all other oxides, it increases.
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