Chemistry Question Bank

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…

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

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…

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…

Most of the chemical reactions are accelerated by …A… in temperature. Here, A refers to

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

According to collision theory of reaction rates, the rate of reaction depends

If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately. (AIPMT 2007)

In a first-order reaction A B -> , if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is. (AIPMT 2007)