\([ A ] \quad \rightarrow \quad[ B ]\) अभिक्रियक उत्पाद यदि यौगिक [B] का विरचन प्रथम कोटि की अभिक्रिया का अनुसरण करता है और \(70 min\) के पश्चात् [A] की सान्द्रता प्रारंभिक सान्द्रता की आधी है, तो अभिक्रिया का वेग स्थिरांक \(x \times 10^{-6}\) \(s ^{-1}\) है। \(x\) का मान, निकटतम पूर्णाक में है \(.......\) I(निकटतम पूर्णाक में)

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.