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यदि किसी प्रथम कोटि की अभिक्रिया का 90%, 90 मिनट में पूर्ण हुआ हो, तो इसके 50% पूर्ण होने में लगने वाला समय होगा (log 2= 0.30)

(i) 30मिनट 

(ii) 36 मिनट 

(iii) 50 मिनट 

(iv) 27 मिनट

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यदि किसी प्रथम कोटि की अभिक्रिया का 90%, 90 मिनट में पूर्ण हुआ हो, तो इसके 50% पूर्ण होने में लगने वाला समय 27 मिनट होगा.

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