Question

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

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

Answer 1

The Correct Option is A

Correct answer is (a): A is correct but R is not correct
$2C(s)+O_2(g)\to 2CO(g)$
${\Delta }_r{S}^0$ is $+ve,{\Delta }_r{G}^0={\Delta }_r{H}^0-T{\Delta }_r{S}^0$; thus slope is negative
As temperature increases ${\Delta }_r{G}^0$ becomes more negative thus it has lower tendency to get decomposed.