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प्रश्न
A first order reaction completes its 10% in 20 minutes, then the time required to complete its 19% is ____________.
पर्याय
30 minutes
40 minutes
50 minutes
38 minutes
MCQ
रिकाम्या जागा भरा
उत्तर
A first order reaction completes its 10% in 20 minutes, then the time required to complete its 19% is 40 minutes.
Explanation:
In first phase, k = `2.303/20 log 100/90` .......(i)
In second phase, k = `2.303/"t" log 100/81` ........(ii)
From eq. (i) and (ii)
`2.303/(20 "min") log 100/90 = 2.303/"t" log 100/81`
0.11515 × 0.0457 min−1 = `2.303/"t" xx 0.0915`
t = `0.2107/(5.2623 xx 10^-3)` min
= 40.0 min
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