19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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)
The reaction of hydrogen and iodine monochloride is given as: 2 g g g 2 g H 2ICl 2HCl I -> The reaction is of first order with respect to 2 g H and g ICl following mechanisms were proposed. Mechanism A: 2 …
The rate constants k1 and k2 for two different reactions are 1016. 2000/T e and 1015. 1000/T e , respectively. The temperature at which k1 = k2 is: (AIPMT 2008)
The bromination of acetone that occurs in acid solution is represented by this equation. CH COCH aq Br aq CH COCH Br aq H aq Br aq -> These kinetic data were obtained for given reaction concentrations. …
For the reaction A + B -> products, it is observed that: (1) On doubling the initial concentration of A only, the rate of reaction is also doubled and (2) On doubling the initial concentrations of both A and B, there …
rate = k [A]1 [B]2
Half life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is: (AIPMT 2009) (a) 0.5 10 s x (b) 0.5 10 s x (c) 5.0 10 s x (d) 5.0 10 s x
In the reaction -> aq aq l l BrO Br H Br H O The rate of appearance of bromine (Br2) is related to rate of disappearance of bromide ions as following: (AIPMT 2009)