Question

The point of intersection and sudden increase in the slope., in the diagram given below, respectively indicates :

• A. $\Delta G=0\text{and melting or boiling point of the metal oxide}$
• B. $\Delta G=0\text{and reduction of the metal oxide}$
• C. $\Delta G<0\text{and decomposition of the metal oxide}$
• D. $\Delta G>0\text{and decomposition of the metal oxide}$

Answer 1

The correct option is A $\Delta G=0\text{and melting or boiling point of the metal oxide}$

From the Ellingham diagram given, the point of intersection represents $\Delta G=0$ and the temperature at which sudden increase in the slope occurs is indicated by melting or boiling.