Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main20254 Apr 2025Evening ShiftChemistryChemical KineticsActual

Half life of zero order reaction A product is 1 hour, when initial concentration of reaction is 2.0 ~mol ~L ~L ⁻¹ . The time required to decrease concentration of A from 0.50 to 0.25 ~mol ~L ⁻¹ is:

Options

  1. A0.5 hour
  2. B4 hour
  3. C15 min
  4. D60 min

Correct answer

C. 15 min

Step-by-step solution

For zero order reaction aligned & Half life = A_o 2 k & 60 = 2 2 k & k= 1 60 M / aligned Now aligned & A _ t = A _ o - kt & t = A _ o - A _ t k & = 0.5-0.25 1 / 60 & 0.25 60 aligned t =15 ~min

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 JEE Main PYQs