Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
99 Percentile Qs Bank for JEE MainChemistryChemical Kinetics

Why do we use the carbon dating to calculate the age of the fossil?

Options

  1. ARate of exchange of carbon between atmosphere and living is slower than decay of C 14 .
  2. BIt is not appropriate to use C 14   dating to determine age.
  3. CRate of exchange of C 14   between atmosphere and living organism is so fast that an equilibrium is set u
  4. DNone of the above.

Correct answer

C. Rate of exchange of C 14   between atmosphere and living organism is so fast that an equilibrium is set u

Step-by-step solution

It is clear from the 3 r d   paragraph, which states that in living organisms a dynamic equilibrium is established where by the ratio of C 14   to C 12   remains constant. Hence, C 14   which decays into N 14   is replenished by the production of new isotopes.

Practice Chemical Kinetics on Quantrex Academy →

More from Chemical Kinetics

For a reversible reaction R P , at constant temperature, both the forward and the backward reactions are first order elementary reactions with rate constants k_f and k_b , respecti 2026For a first-order reaction R P at a given temperature, k is the rate constant. For this reaction, at the given temperature, the concentrations of R and P at a time t are [ R ] and 2026Given below are two statements: R=8.314 J K ⁻¹ mol ⁻¹ and 1 cal =4.2 J Statement I: When E_a=12.6 kcal/mol, the room temperature rate constant is doubled by a 10 ,^ C increase in t 2026Decomposition of a hydrocarbon follows the equation k = (5.5 10¹¹ , s ⁻¹) ,e^ -28000 , K T . The activation energy of reaction is __________ kJ mol ⁻¹ . (Nearest Integer) Given : R 2026For a reaction A P at T K , the half life (t_ 1/2 ) is plotted as a function of initial concentration [A]₀ of A as given below. The value of x in the given figure is _______ s (Nea 2026First order gas phase reaction A B + C p_i = initial pressure of gas A, p_t = total pressure of the reaction mixture at time t Expression of rate constant ( k ) is 2026If the half life of a first order reaction is 6.93 minutes then the time required for completion of 99 % of the reaction will be _____ minutes. (Given : 2 = 0.3010 ) 2026Consider the given graph showing variation of reactant concentration with time. Three different reactions were started with identical initial concentration of reactants. Which of t 2026 Full Chemical Kinetics list All 99 Percentile Qs Bank for JEE Main PYQs