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BITSAT 2020
Exam
BITSAT
Year
2020
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

BITSAT 2020 · Chemistry · General Principles and Processes of Isolation of Metals

Δ_ f G^ - vs T plot in the Ellingham diagram slopes downward for...

ΔfG−\Delta_{f} \mathrm{G}^{-} vs T\mathrm{T} plot in the Ellingham diagram slopes downward for the reaction

Options

  1. AMg+12O2→MgO\mathrm{Mg}+\frac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{MgO}
  2. B2Ag+12O2→Ag2O2 \mathrm{Ag}+\frac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{Ag}_{2} \mathrm{O}
  3. CC+12O2→CO\mathrm{C}+\frac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}
  4. DCO+12O2→CO2\mathrm{CO}+\frac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}

Correct answer

C. C+12O2→CO\mathrm{C}+\frac{1}{2} \mathrm{O}_{2} \rightarrow \mathrm{CO}

Step-by-step solution

C(s)+12O2(g)→CO(g);ΔS\mathrm{C}(\mathrm{s})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{ g}) \rightarrow \mathrm{CO}(\mathrm{g}) ; \Delta \mathrm{S} increases. Hence, as the temperature increases, TΔS\mathrm{T} \Delta \mathrm{S} increases and hence ΔG(ΔH−TΔS)\Delta \mathrm{G}(\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{S}) decreases. In other words, the slope of the curve for formation of CO decreases. However, for all other oxides, it increases.
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