Chemistry - Thermodynamics - II Question with Solution | TestHub

ChemistryThermodynamics - IIGibb's Free EnergyMedium2 minQB

ChemistryMediumsingle choice

Passage / Comprehension

The graphical representation of Gibbs energy was first used by H.J.T. Ellingham. This provides a sound basis for considering the choice of reducing agent in the reduction of oxides. This is known as Ellingham Diagram. Such diagrams help us in predicting the feasibility of thermal reduction of an ore.

Which of the following is correct?

Options:

Answer:

Solution:

At $100 0^{\circ} C$ , the line for $M g \to M g O$ is below the line for $Z n \to Z n O$ , indicating that the Gibbs free energy of formation for $M g O$ is more negative than for $Z n O$ at this temperature. This means $M g$ is a stronger reducing agent than $Z n$ , making the reaction $M g (s) + Z n O (s) \to M g O (s) + Z n (l)$ spontaneous.

Stream:JEESubject:ChemistryTopic:Thermodynamics - IISubtopic:Gibb's Free Energy

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