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एक प्रथम कोटि की रासायनिक अभिक्रिया की अर्द्ध-आयु 6.93 मिनट है अभिक्रिया को 99% पूर्ण होने में लगा समय होगा
(log2=0.3010)
A. 230.3 मिनट
B. 23.03 मिनट
C. 46.06 मिनट
D. 460.6 मिनट

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प्रथम कोटि की अभिक्रिया में 90% पूर्ण होने के लिए
`K=(2.303)/tlog"((100)/(100-99))`
`therefore" " K=(0.693)/(6.93)=0.1 "मिनट"^(-1)`
`therefore" "(2.303)/(0.1)log"((100)/(100-99))=(2.303xx2)/(0.1)`
=46.06 मिनट

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