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1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Half life for a first order reaction is 6.93 hour. What is the time required for 80% completion of the reaction?

A
12 hours
B
18 hours
C
6 hours
D
16 hours
2
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

For first order reaction the concentration of reactant decreases from 0.2 to 0.1 M in 100 minutes. What is the rate constant of the reaction?

A
$144.3 \mathrm{~min}^{-1}$
B
$69.3 \mathrm{~min}^{-1}$
C
$6.93 \times 10^{-3} \mathrm{~min}^{-1}$
D
$6.93 \mathrm{~min}^{-1}$
3
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

A first order reaction is $25 \%$ completed in 40 minutes. What is the rate constant $k$ for the reaction?

A
$\frac{2.303 \times \log 1.33}{40}$
B
$2.303 \times \log {\frac{4}{3}}$
C
$\frac{2.303 \times \log 4}{40 \times 3}$
D
$\frac{2.303}{40} \times \log \frac{1}{4}$
4
MHT CET 2020 16th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

A first order reaction has a rate constant 0.00813 min$$^{-1}$$. How long will it take for 60% completion?

A
56.35 min
B
98.7 min
C
62.77 min
D
112.7 min
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