Which of the following is correct regarding Ellingham diagram?

It is plot of

Δ G_{f}^{^{\circ}}

per mole of metal versus temperature

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Reduction of a metal oxide is difficult if the metal formed is in liquid state at the temperature of reduction

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Plot is a straight line except when some change in phase.

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Ellingham diagram deals with both the feasibility as well as the rate of the reduction process

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Solution

The correct option is A It is plot of $Δ G_{f}^{^{\circ}}$ per mole of metal versus temperature
$\to$ It is a plot of Gibbs energy per mole of metal versus temperature.
$\to$ This diagram provides a basis for considering the choice of reducing agent in the reduction of oxides.

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