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A first order reaction is found to have ...

A first order reaction is found to have a rate constant, `k = 4.2 xx 10^(-12) s^(-1)`. Find the half-life of the reaction.

A

`1.26xx10^(13)s`

B

`1.65xx10^(11)s`

C

`1.65xx10^(11)s`

D

`1.26xx10^(13)s`

Text Solution

Verified by Experts

The correct Answer is:
B
For first order reaction,
`t_(1//2)=(0.693)/(k)=(0.693)/(4.2xx10^(-12)S^(-1))`
`=1.65xx10^(11)s`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CHEMICAL KINETICS -Exercise 1
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  2. Consider the following, C(2)H(2)(g)+H(2)(g)toC(2)H(6)(g). (I) The...

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  3. A first order reaction is found to have a rate constant, k = 4.2 xx 10...

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  4. The rate of the backward reaction in a reversible reaction

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  5. Expression for the half-life of zero order reaction is given as

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  6. The rate constant of a zero order reaction is 0.2 mol L^(-3) h^(-1). I...

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  7. The rate constant for the first order reaction is 60 s^(-1). How much ...

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  8. Inversion of cane sugar is a cdotsAcdots order reaction underset("Ca...

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  9. The rate constant 'K' for pseudo first order reaction is

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  10. Half-life period of a first order reaction is 10 min. Starting with in...

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  11. The rate of first-order reaction is 1.5 xx 10^(-2) M "min"^(-1) at 0.5...

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  12. For a first order reaction half life is 14 sec. The time required for ...

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  13. The half life period of a substance is 50 minutes at a certain initial...

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  14. How much time is requred for two - third completion of a first order r...

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  15. t(1//4) can be taken as the time taken for concentration of reactant t...

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  16. For a reaction, the rate constant is 2.34 s^(-1). The half-life period...

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  17. 75% of a first order reaction was completed in 32 min. When was 50% of...

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  18. Rate constant for a reaction is 10^(-3) S^(-1). How much time is requi...

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  19. A first order reaction is 10% complete in 20 min. the time taken for 1...

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  20. For a zero order reaction, the integrated rate equation is

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