question_answer

    \[\Delta G{}^\circ vsT\] plot in the Ellinghams diagram slopes downwards for the reactions

A)  \[Mg+\frac{1}{2}{{O}_{2}}\xrightarrow[{}]{{}}MgO\]

B)  \[2Ag+\frac{1}{2}{{O}_{2}}\xrightarrow[{}]{{}}A{{g}_{2}}O\]

C)  \[CO+\frac{1}{2}{{O}_{2}}\xrightarrow[{}]{{}}C{{O}_{2}}\]

D)  All of the above

Correct Answer: D

Solution :

                  Reaction (i)\[M(s)+\frac{1}{2}{{O}_{2}}\xrightarrow[{}]{{}}MO(s)\] Reaction (ii) \[CO(g)+\frac{1}{2}{{O}_{2}}\xrightarrow[{}]{{}}C{{O}_{2}}(g)\] Reaction (iii) \[C(s)+\frac{1}{2}{{O}_{2}}\xrightarrow[{}]{{}}C{{O}_{2}}(g)\] \[\Delta G{}^\circ vs,T\]plot in the Ellinghams diagram slopes downwards for the reaction (I) and reaction (II). For reaction (III)\[\Delta G{}^\circ vs,T\]in the diagram slopes upwards.