JEE Main · 2024 · 29 Jan 2024 · Shift 2 · Chemical Kinetics

WhatsApp Email
The half-life of radioisotopic bromine - 82 is 36 hours. The fraction which remains after one day is _____ .
(Given antilog )

Answer: 63

Solution

For first-order radioactive decay, .

Using with hours:


Taking the antilog (given as 1.587):


The fraction of bromine-82 remaining after one day is .

JEE Main · 2024 · 29 Jan 2024 · Shift 2 · Integer answer

More JEE Main questions on Chemical Kinetics

  1. Pre-exponential factors of two different reactions of same order are identical. Let activation energy of first reaction exceeds the activation energy of second reaction by . If and are the rate constants of fir …
    JEE Main 2026View solution →
  2. A → products (First order reaction).

    Three sets of experiment were performed for a reaction under similar experimental conditions.
    Run of 10 M solution of reactant A
    Run of 10 M solution of reactant A
    Run …
    JEE Main 2026View solution →
  3. The temperature at which the rate constants of the given below two gaseous reactions become equal is
    ____ K. (Nearest integer).
    …
    JEE Main 2026View solution →
  4. Decomposition of A is a first order reaction at and is given by . In a closed 1 L vessel, 1 bar is allowed to decompose at . …
    JEE Main 2026View solution →
  5. Correct statements regarding Arrhenius equation among the following are :
    (A) Factor corresponds to fraction of molecules having kinetic energy less than Ea.
    (B) At a given temperature, lower the Ea, faster is the reaction.
    (C) Increase in tempe …
    JEE Main 2026View solution →
  6. Consider and are two reactions. If the rate constant of the reaction can be expressed by the following equation …
    JEE Main 2026View solution →