COMEDK · Chemistry · 19. Chemical Kinetics

The Activation energy for the reaction \(A \rightarrow B+C\), at a temperature \(\mathrm{TK}\) was \(0.04606 \mathrm{~RT} \mathrm{~J} / \mathrm{mol}\). What is the ratio of Arrhenius factor to the Rate constant for this reaction?

A 1.585
B \(3.2 \times 10^{-2}\)
C \(1.047 \times 10^{-2}\)
D 1.047

Verified Solution

Answer & Solution

Correct Answer

(D) 1.047

Step-by-step Solution

Detailed explanation

The Arrhenius equation is given by \(k = A e^{-E_a / RT}\), where \(k\) is the rate constant, \(A\) is the Arrhenius factor, \(E_a\) is the activation energy, \(R\) is the gas constant, and \(T\) is the temperature. Given \(E_a = 0.04606 RT\) J/mol, we substitute this into the…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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What is/are the product/s formed when Benzaldehyde and Ethanal react in presence of dil. \(\mathrm{NaOH}\) followed by heating the intermediate product formed?

COMEDK 2024 Medium

Match the ions given in Column I with their characteristic properties given in Column II.

S.No.	Column I	S.No.	Column II
A	\(Cr^{2+}\)	P	Stable in aqueous medium and has magnetic moment equal to 5.92 BM.
B	\(Cu^+\)	Q	Only stable oxidation state and does not act as reducing agent.
C	\(Mn^{2+}\)	R	Is a good reducing agent due to attainment of stable \(d^3\) configuration.
D	\(Sc^{3+}\)	S	Unstable in aqueous medium and readily disproportionates.

COMEDK 2025 Medium

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