at the temperature
corresponding to point D, which of the following statements is correct?
(a) AC value for the
overall reduction reaction with carbon monoxide is zero.
(b) AC value
for the overall reduction reaction with a mixture of 1 mol carbon and 1 mol
oxygen is positive.
(c) AC value
for the overall reduction reaction with a mixture of 2 mol carbon and 1 mol
oxygen will be positive.
(d) AC value for the
overall reduction reaction with carbon monoxide is negative.
Answer:
(a) At point D, 
curve for formation of 
from CO and 
from Fe intersect each other therefore,
overall reduction of with CO is zero.
Hence, (a) is the
correct choice.
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