Question

Which of the following statements is correct according to the basic concepts of thermodynamics which govern the feasibility of a metallurgical process?

• A. When the value of $\Delta \mathrm { G }$ is positive for the equation $\Delta \mathrm { G } = \Delta \mathrm { H } - \mathrm { T } \Delta \mathrm { S }$ the reaction will proceed.
• B. If reactant and products of two reactions are put together and net $\Delta \mathrm { G }$ is –ve, the overall reaction will
• C. On increasing the temperature the value of $\Delta \mathrm { G }$
• D. Feasibility of thermal oxidation of an ore can be established by Ellingham diagram in which a straight line shows the reduction reaction will proceed.

Answer 1

Answer: (B)

If reactant and products of two reactions are put together and net $\Delta \mathrm { G }$ is –ve, the overall reaction will

Answer 2

The process of interpretation involves coupling of two reactions, getting the sum of $\Delta \mathrm { G }$ and looking for its sign. Overall –ve value of $\Delta \mathrm { G }$ shows that reduction of ore is possible.