Question
_ f G ^ - vs T plot in the Ellingham diagram slopes downward for the reaction
BITSAT
Chemistry
General Principles and Processes of Isolation of Metals
2020
BITSAT 2020
BITSAT Chemistry Question (2020) — Solution
Options
- A. Mg + 1 2 O _ 2 MgO
- B. 2 Ag + 1 2 O _ 2 Ag _ 2 O
- C. C + 1 2 O _ 2 CO
- D. CO + 1 2 O _ 2 CO _ 2
Answer
C. C + 1 2 O _ 2 CO
Step-by-step solution
C ( s )+ 1 2 O _ 2 ( ~g ) CO ( g ) ; S increases. Hence, as the temperature increases, T S increases and hence G ( H - T S ) decreases. In other words, the slope of the curve for formation of CO decreases. However, for all other oxides, it increases.
Related: Chemistry — General Principles and Processes of Isolation of Metals · All PYQ Banks