19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In a reaction 2HI ⟶ H2 + I2, the concentration of HI decreases from 0.5 mol L–1 to 0.4 mol L–1 in 10 minutes. What is the overall rate of reaction during this interval?
Consider the reaction, 2N O 4NO O . -> In the reaction NO2 is being formed at the rate of 0.0125 mol L–1 s–1. What is the rate of reaction at this time?
Chemical kinetics plays an important role in
The slope of Arrhenius plot (ln k v/s 1/T) of first order reaction is 5 10 . K x The value of a E of the reaction is. Choose the correct option for your answer. (Given R = 8.314 Jk-1 mol-1) (NEET 2021)
For a reaction A → B, enthalpy of reaction is -4.2 kJ mol-1 and enthalpy of activation is 9.6 kJ mol-1. The correct potential energy profile for the reaction is shown in option. (NEET 2021) (a) (b) (c) (d)
Most of the chemical reactions are accelerated by …A… in temperature. Here, A refers to
The initial concentration of N2O5 in the following order reaction, N O g 2NO g g -> was 1.24 10 molL x at 318 K. The concentration of N2O5 after 60 min was 0.20 × 10-2 mol L-1. Calculate the rate constant of the…
Consider some facts about decomposition of H2O2. I.It is catalyzed by iodide ion in acidic or alkaline medium. II.It is second order reaction with respect to both H2O2 and I- III.Rate equation of this particular react…
For a chemical reaction with rise in temperature by 10oC, the rate constant is nearly …A…, Here, A refers to
The rate of reaction is doubled for every 10ºC rise in temperature. The increase in rate as result of increase in temperature from 10ºC to 100ºC is
The rate constant of a reaction is given by ln k (sec–1) = 14.34 – (1.25 × 104)/T What will be the energy of activation?
The correct form of Arrhenius equation is (a) a E /RT k Ae (b) a RT/E k Ae (c) a E /RT k Ae (d) a RT/E k Ae
In Arrhenius equation mentioned in Above Ques. ‘A’ is
On the basis of Arrhenius equation mentioned in Above ques. consider the following statements. I.Ea is activation energy. II.Unit of Ea is J mol-1 III.R is gas constant. Which of these are true statements?
In the Arrhenius equation, a E /RT k Ae , the factor a E /RT e corresponds to the
What will happen, on increasing the temperature or decreasing the activation energy (answer on the basis of Arrhenius equation)?
The temperature dependence of the rate constant k is expressed as a E RT k Ae When a plot between log k and 1/T is plotted we get the graph as shown. What is the value of slope in the graph? (a) a E RT (b) a E 2.303…
Energy of activation of an exothermic reaction is
In the graph shown below ‘I’ means
The role of a catalyst is to change
In a 1st order reaction, the fraction of molecules at 450ºC having sufficient energy (or fraction of effective collisions) is 1.92 × 10–16. What is activation energy value of this reaction?
In a reaction A ->B threshold energy of the reactant is 120 kJ mole–1 and the normal energy of the reactant is 20 kJ mole–1 what is the activation energy barrier of the reaction A ->B.
What is the rate of reaction for a bimolecular elementary reaction?
Which of the following is a drawback of collision theory? a) Proper orientation b) High activation energy c) Hard spheres d) Have energy equal to or greater than the threshold energy
The rates of reactions increase with increase of temperature because