Ellingham diagrams are plots of ΔGº vs temperature which have applic

1.	Ellingham diagrams are plots of ΔGº vs temperature which have applications in metallurgy2H2 + O2 = 2H2O ΔG(J) = –247500 +55.85 T ........ (I)2CO + O2 = 2CO2 ΔG(J) = –282400 +86.81 T.......... (II)The Ellingham diagrams for the oxidation of H2(I) and CO (II) are given below.The two lines intersect (TE) at 1125 K.Which of the following is correct ?I. Δ Gº for reaction (i) is more negative at T < 1125KII. Δ G° for the reduction of CO is more negative at T < 1125 KIII. H2 is a better reducing agent at T > 1125 KIV. H2 is a better reducing agent at T < 1125 K(A) I and II (B) I and III (C) III only (D) I and IV
Answer» Correct answer is (C) III only According to the given data, Plot I is for CO as it has more negative ΔG value Plot II is for H₂. And as we know in the Ellingham diagram, compound for which, the Plot lies below acts as a better reducing agent. So, at T > 1125 K, H₂ is a better reducing agent. Note: The given graph in the question is not according to given data in the question.

Ellingham diagrams are plots of ΔGº vs temperature which have applications in metallurgy2H2 + O2 = 2H2O ΔG(J) = –247500 +55.85 T ........ (I)2CO + O2 = 2CO2 ΔG(J) = –282400 +86.81 T.......... (II)The Ellingham diagrams for the oxidation of H2(I) and CO (II) are given below.The two lines intersect (TE) at 1125 K.Which of the following is correct ?I. Δ Gº for reaction (i) is more negative at T < 1125KII. Δ G° for the reduction of CO is more negative at T < 1125 KIII. H2 is a better reducing agent at T > 1125 KIV. H2 is a better reducing agent at T < 1125 K(A) I and II (B) I and III (C) III only (D) I and IV

Answer»

Correct answer is (C) III only

According to the given data, Plot I is for CO as it has more negative ΔG value Plot II is for H₂. And as we know in the Ellingham diagram, compound for which, the Plot lies below acts as a better reducing agent. So, at T > 1125 K, H₂ is a better reducing agent.

Note: The given graph in the question is not according to given data in the question.

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