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A first order reaction is half completed...

A first order reaction is half completed is 45 minutes. How long does it need for 99.9% of the reaction tobe completed?

A

`20` hours

B

`10` hours

C

`7.(1)/(2)` hours

D

`5` hours

Text Solution

Verified by Experts

The correct Answer is:
C
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AAKASH SERIES-CHEMICAL KINETICS-Objective Exercise - 2
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  2. In a first order reaction, 20% reaction is completed in 24 minutes.The...

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  3. A first order reaction is half completed is 45 minutes. How long does ...

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  4. For a first order reaction AtoB the reaction rate at reactant concetra...

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  5. 99% of a first order reaction was completed in 32 in. When wil 99.9% o...

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  6. For a first order reaction with half life of 150 seconds, the time tak...

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  7. A reaction which is of first order w.r.t reactant A has a rate constna...

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  8. A hypothetical reaction A2 + B2 to 2AB follows the mechanism as given...

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  9. Depletion of ozone occurs as : 2O3 to 3O2 Step 1: O3 overset(Kc...

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  10. For a first order process A to B , rate constant k1 = 0.693 "min"^(-...

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  11. For Products, the concentration of sucrose changes from 0.06 M to 0....

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  12. 99% of a 1st order reaction completed in 2.303 minutes. What is the ra...

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  13. The rate constant of a reaction at 200K is 10 times less than rate con...

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  14. Out og 300 g substance [decomposes as per 1st order], hou much will re...

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  15. 75% of a first order process is completed in 30 min. The time required...

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  16. For a first order reaction at 27^@C, the ratio of time required for 75...

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  17. The half life period of a first order chemical reaction is 6.93 minute...

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  18. In a first order reaction, the concentration of the reactant, decrease...

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  19. The chemical recation 2O(3) to 3O(2) proceeds as follows : O(3)overset...

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  20. 90% of first order process X to Y is completed in a time equals to 99%...

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