Question

In the following Ellingham diagram, X, Y and Z represent graphs for metal oxides. Select the correct option.

• A. Y will reduce oxide of Z.
• B. Y will reduce oxide of X.
• C. Z will reduce oxide of X.
• D. Z will reduce oxide of Y.

Answer 1

The correct option is A Y will reduce oxide of Z.

An Ellingham diagram is a graph showing the temperature dependence of the stability for the compounds. This analysis is usually used to evaluate the ease of reduction of metal oxides and sulphides.

Features-

$1.$ The lower the position of a metal's line in the Ellingham diagram the greater the stability of its oxide.

$2.$ Stability of Metallic oxide decreases with increases in temperature.

$3.$ For a given temperature if $2$ metals are compared, the metal with lower Gibbs free energy of oxidation on the diagram will reduce the oxide with higher Gibbs free energies.

$4.$ The greater the gap between any two lines the greater the effectiveness of reducing agents to the lower line.

$5.$ The intersection of two lines implies an oxidation-reduction equilibrium.

So, by this point no. $3$: $Y$ will reduce oxide of $Z$.