A metal oxide $M O_{(s)}$ can be reduced by carbon or carbon monoxide successfully when the line in Ellingham diagram for reaction (i):

lies above the line for one of the reactions (ii) to (iv)

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intersects the line for one of the reactions (ii) to (iv)

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lies below the line for one of the reactions (ii) to (iv)

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may lie above or below the line for one of the reactions (ii) to (iv) depending upon the temperature

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Solution

The correct option is B lies below the line for one of the reactions (ii) to (iv)
A metal oxide $M O_{(s)}$ can be reduced by carbon or carbon monoxide successfully when the line in Ellingham diagram for reaction (i):
lies below the line for one of the reactions (ii) to (iv).
This is because, at a given temperature, the free energy change for the oxidation of metal to metal oxide will be more positive (or less negative) than that for the reactions (ii) to (iv)
A reaction is spontaneous when the free energy change is negative.

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Similar questions

These equilibria can be discussed in terms of thermodynamic functions.

For the reaction :

(i)

M_{(s)} + \frac{1}{2} O_{2 (g)} \to M O_{(} s)

(ii)

\frac{1}{2} C_{(s)} + \frac{1}{2} O_{2 (g)} \to \frac{1}{2} C O_{2 (g)}

(iii)

C_{(s)} + \frac{1}{2} O_{2 (g)} \to C O_{(g)}

(iii)

C O_{(g)} + \frac{1}{2} O_{2 (g)} \to C O_{2 (g)}

The temperature dependence of

Δ ˚ G

of reaction (i) to (iv) is shown in the given diagram. This is known as the Ellingham diagram. With the help of the Ellingham diagram, one can easily predict the most suitable reducing agent for the reduction of metal oxides.

A I_{2} O_{3}

can be reduced by carbon at a temperature of:

Q. According to Ellingham diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which one of the following oxides at the lowest temperature?

Based on the above Ellingham diagram, the formation of carbon monoxide from carbon can reduce the metal oxide to metal at a temperature _______ the point of intersection of the two lines.
1. Equal to
2. Higher than
3. Lower than
4. None

Zine oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation for this reation. Name (i) oxidising agent, and (ii) reducing agent, in this reaction.

Q. For the reaction

{F e}_{2} O_{3} + 3 C O ⟶ 2 F e + 3 C O_{2}

the volume of carbon monoxide required to reduce one mole of ferric oxide is:

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A metal oxide MO(s) can be reduced by carbon or carbon monoxide successfully when the line in Ellingham diagram for reaction (i):

A metal oxide $M O_{(s)}$ can be reduced by carbon or carbon monoxide successfully when the line in Ellingham diagram for reaction (i):