Chemistry Question Bank

For the reaction : sunlight H Cl 2HCl ->

The initial rates of reaction 3A + 2B + C -> Products, at different initial concentrations are given below: Initial rate M s–1 [A]0 , M [B]0 , M [C]0 , M 5.0 × 10–3 0.010 0.005 0.010 5.0 × 10–3 0.010 0.005 0.015 1.0 ×…

The hypothetical reaction A B 2AB; -> follows the following mechanism Fast A A A, -> Slow Fast A B AB B,A B AB. -> -> The order of the overall reaction is

The reaction of hydrogen and iodine monochloride is given as: H g 2ICl g 2HCl g I g -> The reaction is of first order with respect to H2 (g) and ICl(g), following mechanisms were proposed. Mechanism A: H g 2…

For a certain reaction A -> products, the t1/2 as a function of [A]0 is given as below: [A]0 (M) : 0.1 0.025 t1/2 (min) : 100 Which of the following is/are true ?

In most cases, for a rise of 10K temperature the rate constant is doubled to tripled. This is due to the reason that (a)collision frequency increases by a factor of 2 to 3. (b)fraction of molecules possessing threshol…

The first order rate constant for a certain reaction increases from 1.667 × 10–6 s–1 at 727ºC to1.667 × 10–4 s–1 at 1571ºC. The rate constant at 1150ºC, assuming constancy of activation energy over the given temperatu…

Ea and H values of reactions R1, R2, R3 and R4 carried out at the same temperature are as given below: R1 Ea = 40 kJ mol–1, H = – 80 kJ mol–1 R2 Ea = 20 kJ mol–1, H = – 30 kJ mol–1 R3 Ea = 60 kJ mol–1, H = + 40 kJ mol…

The potential energy diagram for a reaction R P -> is given below o H of the reaction corresponds to the energy:

An endothermic reaction with high activation energy for the forward reaction is given by the diagram : (a) (b) (c) E E (d)

For a first order reaction A P, the temperature (T) dependent rate constant (k) was found to follow the equation 1 logk 6.0 T . The pre- exponential factor A and the activation energy Ea, respectively are: (a) 1.0…

Collision theory is used to explain how chemical species undergo a reaction. Using this theory and the kinetic molecular model, which of the following does NOT influence the rate of a chemical reaction?

Choose the correct answer out of the following choices. Assertion (A): Most people think diamond is forever. Reason (R): Conversion rate of diamond to graphite is very low.

Assertion (A): In rate law, unlike in the expression for equilibrium constants, the exponents for concentrations do not necessarily match the stoichiometric coefficients. Reason (R): It is the mechanism and not the ba…

Assertion (A): If the activation energy of a reaction is zero, temperature will have no effect on the rate constant. Reason (R): Lower the activation energy, faster is the reaction.

The instantaneous rate of reaction at the beginning of the reaction is

The rate of formation of NO2 during the period 600 – 700 s is

The rate of formation of NO2 during the period 600 – 700 s is

For the reaction 4 A B C D -> , which of the following statement is not correct ?

With passage of time, the concentration of reactants …A… and rate of reaction …B… . Here A and B are

Select the rate law that corresponds to the data shown for the following reaction A B C -> Expt. (A) (B) Initial rate 0.012 0.035 0.10 0.024 0.070 0.80 0.024 0.035 0.10 0.012 0.070 0.80

For the following reaction: NO2(g) + CO(g) ->NO(g) + CO2(g), the rate law is: Rate = k [NO2]2.If 0.1 mole of gaseous carbon monoxide is added at constant temperature to the reaction mixture which of the following stat…

The following data pertains to reaction between A and B : S. No. [A] mol L–1 [B] mol L–1 Rate (mol L–1 time–1) 1 1.0 × 10–2 2.0 × 10–2 2.0 × 10–4 2 2.0 × 10–2 2.0 × 10–2 4.0 × 10–4 3 2.0 × 10–2 4.0 …

A reaction which is of first order w.r.t. reactant A, has a rate constant 6 min–1. If we start with [A] = 0.5 mol L–1, when would [A] reach the value of 0.05 mol L–1

T50 of first -order reaction is 10 min. Starting with 10 mol L–1, rate after 20 min is