Q7 / 90 · JEE Main 2023 (01 Feb Shift 1) · Chemistry

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
     Both A and R are correct and R is the correct explanation of A
  • B
    A is not correct but R is correct
  • C
    (3) Both A and R are correct but R is NOT the correct explanation of A
  • Correct answer
    D
    A is correct but R is not correct

Solution

2C(s)+O2( g)→2CO(g)

As the number of moles of gas increases entropy increases.

∆rS° is +ve

∆rGo=∆H°-T∆rS°

Slope = ∆rS° = -ve

As temperature increases ΔrG° becomes more negative thus it has lower tendency to get decomposed.

Hence, A is correct but R is not correct.

Hence, the correct answer is option: 'D'.

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