એક રાસાયણિક પ્રક્રિયાનો વેગ અચળાંક, પ્રક્રિયાના તાપમાનમાં \(9\, K\)નો વધારો કરતા બમણો માલૂમ પડયો.જો પ્રક્રિયા \(300\, K\) તાપમાને થતી હોય તેમ ધારીએ તો, સક્રિયકરણ ઊર્જાનુ મૂલ્ય............\(k\,J\, mol ^{-1}\) થાય. [નજીકનો પૂર્ણાંક] (આપેલું છે\(: \ln 10=2.3, R =8.3 \,J\, K ^{-1} \,mol ^{-1}, \log 2=0.30\) )

A \(66\)
B \(12\)
C \(59\)
D \(78\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(59\)

Step-by-step Solution

Detailed explanation

\(\log _{10} \frac{ K _{2}}{ K _{1}}=\frac{ E _{ a }}{2.303 R }\left(\frac{1}{300}-\frac{1}{309}\right)\) \(0.3=\frac{ E _{ a }}{2.303 \times 8.3}\left(\frac{9}{300 \times 309}\right)\) \(E _{ a }=\frac{0.3 \times 2.303 \times 8.3 \times 300 \times 309}{9}\) \(=59065.04\, J\)…

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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