उपरोक्त प्रथम कोटि की \(318 K\) पर अभिक्रिया के लिए \(N _{2} O _{5}\) की प्रारंभिक सान्द्रता \(2.40 \times 10^{-2} mol\) \(L ^{-1}\) है। एक घंटे के पश्चात \(N _{2} O _{5}\) की सान्द्रता \(1.60 \times 10^{-2} mol L ^{-1}\) हो जाती है इस अभिक्रिया का \(318 K\) पर दर नियतांक.......... \(\times 10^{-3} \min ^{-1}\) है। (निकटतम पूर्णांक में) [दिया है \(: \log 3=0.477, \log 5=0.699\) ]

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.