Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202124 Feb 2021Evening ShiftChemistryChemical KineticsActual

Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half-life of 3 . 33 h at 25 ° C . After 9 h , the fraction of sucrose remaining is f . The value of log 10 1 f is ________ × 10 - 2 . (Rounded off to the nearest integer) [Assume: In 10 = 2 . 303 , ln 2 = 0 . 693 ]

Correct answer

0

Step-by-step solution

C 12 H 22 O 11 + H 2 O → t 1 / 2 = 10 3 hr order C 6 H 12 O 6 Glucose + C 6 H 12 O 6 Fructose t = 0    a = A 0 t = 9 hr    a - x = A t from I order kinetic: k × t 2 . 303 = log A 0 A t ⇒ ln 2 × 9 10 3 × 2 . 303 = log 1 f ⇒ 0 . 693 × 9 × 3 23 . 03 = log 1 f ⇒ log 1 f = 0 . 81246 = 81 . 24 × 10 - 2 ⇒ x = 81

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