Chemistry Question Bank

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?

The role of a catalyst is to change

In the graph shown below ‘I’ means

Energy of activation of an exothermic reaction is

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…

What will happen, on increasing the temperature or decreasing the activation energy (answer on the basis of Arrhenius equation)?

In the Arrhenius equation, a E /RT k Ae , the factor a E /RT e corresponds to the

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 Arrhenius equation mentioned in Above Ques. ‘A’ is

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

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 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

A reaction having equal energies of activation for forward and reverse reaction has: (NEET 2013) (a) G (b) H (c) H G S (d) S

For a chemical reaction with rise in temperature by 10oC, the rate constant is nearly …A…, Here, A refers to

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…

Half-life a reaction is found to be inversely proportional to the cube of its initial concertration. Order of reaction is

For a homogeneous gaseous reaction, A B C D, -> in the initial pressure was P0 while pressure after time t was P. Expression for rate constant K in terms of P0, P and t is: (a) 2P 2.303 K log t 3P P (b) 4P…

Which of the following is not similar between a first order and pseudo first order reaction?

The rate law for inversion of cane sugar is R=k [C12H22O11][H2O]. Find the concentration of sucrose if the rate of the reaction is 0.032 s-1 and rate constant k=0.005.

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C? (R = 8.314 J mol–l K–l) (NEET Kar. 2013)

For a reaction between A and B the order with respect to A is 2 and the order with respect to B is 3. The concentrations of both A and B are doubled, the rate will increase by a factor of: (NEET Kar. 2013)

A reaction is 50% completed in 2 hours and 75% completed in 4 hours. The order of reaction is (NEET Kar. 2013)

The inversion of cane sugar is first order in [sugar] and proceeds with half-life of 600 minutes at pH = 4 for a given concentration of sugar. However, if pH = 5, the half-life changes to 60 minutes. The rate law expr…