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The mass of an object changes from 0.002 g to 0.00025 g in a time period of 1500 years.The half-life of the object is
Options
(a) 500 yrs
(b) 850 yrs
(c) 700 yrs
(d) 1000 yrs
Correct Answer:
500 yrs
Explanation:
Here, N₀ = 0.002 g, N = 0.00025 g. t = 1500 years.
Now , k = 2.303 / t log N₀ / N = 2.303 / 1500 log (0.002 / 0.00025).
t (1/2) = 0.6993 / k = 500 years.
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Topics: Electrochemistry and Chemical Kinetics
(87)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When enthalpy and entropy change for a chemical reaction are – 2.5 x 10³ cals
- when a manganous salt is fused with a mixture of KNO₃ and solid NaOH
- The number of d-electrons in Fe²⁺(Z=26) is not equal to the number of electrons
- In the gas phase reaction C₂H₂ + H₂ ⇌ C₂H₆, the equilibrium constant
- The change in oxidation state of sulphur when sulphur dioxide is passed
Topics: Electrochemistry and Chemical Kinetics (87)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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