Ellingham Diagram

Q.

In the Ellingham diagram for oxides, the general trend for the graphs for metal to metal oxide is

1. They slope upwards

2. They are all parallel to the $\Delta G^{\circ }$ = 0 horizontal axis

3. There is no common trend

4. They slope downwards like the $2C+O_2$ $\to$ 2CO line

Q. Considering the Ellingham diagram, which of the following metals can be used to reduce alumina?

1. $Mg$
2. $Zn$
3. $Fe$
4. $Cu$

Q. Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

Q. The Ellingham diagram for different metals is given below.

The metal that can be reduced by most of the metals is:

1. A
2. D
3. F
4. C

Q. Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

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1. $Cu$
2. $Zn$
3. $Mg$
4. $Fe$

Q. The extraction of metals from oxide ores involve(s):

1. Reduction with carbon
2. Reduction with aluminium
3. Electrolytic reduction
4. Reduction with CO

Q.
Which of the following is incorrect on the basis of the above Ellingham diagram for carbon?

1. Up to ${710}^{\circ }C$, the reaction of formation of $C{O}_2$ is energetically more favorable, but above ${710}^{\circ }C$, the formation of $CO$ is preferred.
2. In principle, carbon can be used to reduce any metal oxide at a sufficiently high temperature.
3. $\Delta S(C_{\left(s\right)}+\frac{1}{2}{O}_{2\left(g\right)}\to C{O}_{\left(g\right)})<\Delta S(C_{\left(S\right)}+O_{2\left(g\right)}\to C{O}_{2\left(g\right)})$
4. Carbon reduces many oxides at elevated temperature because $\Delta G^{\circ }$ vs temperature line has a negative slope.

Q. Ellingham diagrams are a plot of $\Delta G^{\circ }$ vs T for the formation of:

1. oxides
2. halides
3. sulphides
4. all of these

Q.

How is aluminum obtained from aluminum oxide?

Q.

The $\frac{{\Delta }_f{G}^{\circ }}{T}$ line for $C+O_2$ $\to$ $C{O}_2$ is nearly parallel to the ${\Delta }_f{G}^{\circ }$ = 0 – True or False?

1. True

2. False

Q.

Oxides of metals like Ti, Cr and Fe can be reduced by Al in the Aluminothermic process – True or False?

1. True

2. False