Which of the following graphs correctly represents the variation of thermodynamic properties of Haber's process? ()

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Strategy:
 Analyze the thermodynamics of Haber's process: . The reaction is exothermic () and involves a decrease in entropy ().

Step 1: Plot analysis for 
.
Since  and  are both negative:
.
As  increases, the term  becomes less negative (approaches  from below), while  is roughly constant. Thus  increases with . Multiplied by , the property  decreases. Graph (a) correctly shows these slopes and relative positions.

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