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(A) Radioactive disintegration process c...

(A) Radioactive disintegration process can never go to completion
(R ) Radio disintegration process follows first order kinetics

A

Both (A) and (R ) are true and (R ) is the correct explanation of (A)

B

Both (A) and (R ) are true and (R ) is not the correct explanation of (A)

C

(A) is true but (R ) is false

D

Both (A) and (R ) are false

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A
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Radioactive decay is a statisticle process i.e., we cannot precisely predict the timing of a particular radioactivity of a particular nucleus . The nucleus can disintegrate immediately or it may take infinite time . Simply the probability of the number of nuclei being disintegrated at any instant can be predicted . the rate at which a particular decay process in a radioactive sample is directly proportional to the number of radioactive nuclei present and thus obeys first order kinetics . the factor dN/N expresses the fraction of nuclei decayed in time dt. t_(1//2) is the time in which half of the atoms are decayed and average life is the time for the nucleus to survive before decay . Which of the following relation is correct ? (t_(1//2) and t_(3//4) are time required to complete half and 3/4 decay respectively )

Radioactive decay is a statisticle process i.e., we cannot precisely predict the timing of a particular radioactivity of a particular nucleus . The nucleus can disintegrate immediately or it may take infinite time . Simply the probability of the number of nuclei being disintegrated at any instant can be predicted . the rate at which a particular decay process in a radioactive sample is directly proportional to the number of radioactive nuclei present and thus obeys first order kinetics . the factor dN/N expresses the fraction of nuclei decayed in time dt. t_(1//2) is the time in which half of the atoms are decayed and average life is the time for the nucleus to survive before decay . A freshly prepared radioactive source of half period 2 hour emits radiations on intensity which is 64 times of the permissible safe level. The minimum time after which it would be possible to work with this source is :

Radioactive decay is a statisticle process i.e., we cannot precisely predict the timing of a particular radioactivity of a particular nucleus . The nucleus can disintegrate immediately or it may take infinite time . Simply the probability of the number of nuclei being disintegrated at any instant can be predicted . the rate at which a particular decay process in a radioactive sample is directly proportional to the number of radioactive nuclei present and thus obeys first order kinetics . the factor dN/N expresses the fraction of nuclei decayed in time dt. t_(1//2) is the time in which half of the atoms are decayed and average life is the time for the nucleus to survive before decay . 75 atoms of a radioactive species are decayed in 2 half lives (t_(1//2) = 1 hr ) if 100 atoms are taken initially . Number of atoms decayed if 200 atoms are taken in 2 hr are :

Radioactive disintegration is a first order reaction and it's rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure . The rate of radioactive disintegration (Activity) is represented as - (dN)/(dt) = lambda N , Where lambda = decay constant , N number of nuclei at time t , N_(0) = initial no. of nuclei. The above equation after integration can be represented as lambda = (2.303)/(t) "log" ((N_(0))/(N)) Calculate the half-life period of a radioactive element which remains only 1/16 of it's original amount in 4740 years :

Radioactive disintegration is a first order reaction and it's rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure . The rate of radioactive disintegration (Activity) is represented as - (dN)/(dt) = lambda N , Where lambda = decay constant , N number of nuclei at time t , N_(0) = initial no. of nuclei. The above equation after integration can be represented as lambda = (2.303)/(t) "log" ((N_(0))/(N)) Half-life period of U^(232) is 2.5 xx 10^(5) years . In how much time will the amount of U^(237) remaining be only 25% of the original amount ?

Radioactive disintegration is a first order reaction and it's rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure . The rate of radioactive disintegration (Activity) is represented as - (dN)/(dt) = lambda N , Where lambda = decay constant , N number of nuclei at time t , N_(0) = initial no. of nuclei. The above equation after integration can be represented as lambda = (2.303)/(t) "log" ((N_(0))/(N)) What is the activity in Ci (curie) of 1.0 mole of Plutonium - 239 ? ( t_(1//2) = 24,000 years)

If a substance with half life 3 days is taken at other place in 12 days. What amount of substance is left now, if it follows first order kinetics

(A) A pseudo first order recation occurs slowly. (R ) Reactions of higher order can follow kinetics of first order under special conditions.

(A) Half life period of first order reaction is independent of concentration of the reactant (R ) 99.9% reaction of first order reaction completes in 10 half lives (A.P Agri - 2017 )

AAKASH SERIES-CHEMICAL KINETICS-Objective Exercise - 4 (Assertion (A) & Reason (R) Type Questions)
  1. (A) All Ionic reactions are Instantaneous (R ) Ionic reactions do no...

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  2. (A) Most of the molecular reactions occur with moderate rates (R ) M...

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  3. (A) Units of rate of reaction are independent of order of the reaction...

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  4. (A) A first order reaction is always unimolecular (R ) A unimolecula...

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  5. (A) Acidic hydrolysis of ethyl acetate with excess water is a first o...

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  6. (A) Decomposition of Ammonia on platinum surface at high pressure is a...

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  7. (A) Radioactive disintegration process can never go to completion (R...

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  8. (A) Alkaline hydrolysis of ethyl acetate follows first order kinetic ...

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  9. (A) Rate of constant of a reaction increases with increase in temperat...

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  10. (A) Presence of catalyst increases the rate of reaction (R ) Presenc...

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  11. (A) The rate law of a reaction cannot be predicted from its balanced c...

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  12. (A) Half life period of first order reaction is independent of concent...

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  13. A: Rate constant of a reaction at a particular temperature is constant...

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  14. A: Lesser the activation energy, greater is the rate of reaction R: ...

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  15. (A) Molecularity has no meaning for a complex reaction. (R ) The ove...

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  16. (A) If the activation energy of a reaction is zero, temperature has no...

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  17. (A) The overall order of the reaction is the sum of the exponents of a...

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  18. (A) Rate of reaction can also increase with the formation of product, ...

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  19. (A) Order and molecularity are always equal (R ) Complex reactions t...

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  20. (A) The order of a reaction may be nagative. (R ) In some cases, the...

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