Verified Solution • 2025–26 Session moderate

QJEEM23Che2bf: JEE Main 2023 Chemistry - Class 12 JEEM23Che2bf Solution: Given below are two statements: one is labelled as Assertion A…

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.

Reason R: CO tends to get decomposed at higher temperature.

In the light of the above statements, choose the correct answer from the options given below

Multiple Choice Options

  • A A is correct but R is not correct
  • B Both A and R are correct but R is NOT the correct explanation of A
  • C A is not correct but R is correct
  • D Both A and R are correct and R is the correct explanation of A

Step-by-Step Verified Solution

2C(s)+O2( g)→2CO(g)2 \mathrm{C}(\mathrm{s})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}(\mathrm{g})

ΔrS0\Delta_{\mathrm{r}} \mathrm{S}^0 is +ve,ΔrG0=ΔrH0−TΔrS0+v e, \Delta_{\mathrm{r}} \mathrm{G}^0=\Delta_{\mathrm{r}} \mathrm{H}^0-\mathrm{T} \Delta_{\mathrm{r}} \mathrm{S}^0 ;

Thus slope is negative.

As temperature increases ΔrGo\Delta_{\mathrm{r}} G^{\mathrm{o}} becomes more negative thus it has lower tendency to get decomposed.

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