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Solution


Q.

Which of the following graphs correctly represents the variation of thermodynamic properties of Haber’s process            [2025]
1  
2  
3  
4  

Ans.

(1)

(I)  N2(g)+3H2(g)⇌2NH3(g),  ΔH°=-46.1 kJ mol-1

As number of gaseous moles decrease, ΔS°<0.  

Both ΔH° and ΔS° are negative and almost remain constant with change of temperature.

(II)  ΔG°=-RTlnK

-ΔG°T=RlnK

For exothermic reaction, value of equilibrium constant decreases with increase in temperature, so -ΔG°T decreases with increase in temperature.

(III)  As ΔH° is negative -ΔH°T is positive and it decreases with increase in temperature.