Purification And Characterisation Of Organic Compounds Question 7
Question: $ {\Delta _{f}}G{{~}^{-}}vs $ T plot in the Ellingham diagram slopes downward for the reaction
Options:
A) $ Mg+\frac{1}{2}O_2\to MgO~ $
B) $ 2Ag+\frac{1}{2}O_2\to Ag_2O $
C) $ C+\frac{1}{2}{O _{2~}}\to CO $
D) $ CO+\frac{1}{2}{O _{2~}}\to CO_2 $
Show Answer
Answer:
Correct Answer: C
Solution:
[c] $ C(s)+\frac{1}{2}O_2(g)\to CO(g);\Delta S $ increases.
Hence, as the temperature increases, $ T\Delta S $ increases and hence $ \Delta G( \Delta H-T\Delta S ) $ decreases.
In other words, the slope of the 1 curve for formation of CO decreases.
However, for all other oxides, it increases.
BETA
