KCET2012ChemistryGeneral Principles and Processes of Isolation of Metals
From the Ellingham graphs on carbon, which of the following statements is false?
Options
- ACO reduces Fe ₂ O ₃ to Fe at less than 983 ~K
- BCO is less stable than CO ₂ at more than 983 ~K
- CCO reduces Fe ₂ O ₃ to Fe in the reduction zone of blast furnace
- DCO ₂ is more stable than CO at less than 983 ~K
Correct answer
B. CO is less stable than CO ₂ at more than 983 ~K
Step-by-step solution
In Ellingham graph, initially the _ f G ^ more negative for CO ₂ , thus, CO ₂ is more stable than CO but when the temperature becomes 983 ~K , the conditions inverted i.e., _ f G ^ of CO becomes more negative and hence above 983 ~K , CO becomes more stable than CO ₂ .