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एक प्रथम कोटि की अभिक्रिया `50%` पूर्ण होने में 30 मिनट का समय लेती है। इस अभिक्रिया का 90% पूर्ण होने में लगने वाने समय का परिकलन कीजिए।

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Correct Answer - ` t= 99.7 min`
`t= (2.303)/(k) log10 .(a)/((a-x))`
`k= (0.693/(t_(1//2))= (0.693)/(30)`
`a= 100,(a-x) =100 - 90 =10`
`t= (2.303 xx 30)/(0.693) log 10 .(100)/(10)`
`= 99.7 ` मिनट

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