Chemistry MCQ on Chemical Kinetics

In a reaction, A + B → Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be written as

In a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become

The activation energy of a reaction at a given temperature is found to be 2.303 RT J mol–1. The ratio of rate constant to the Arrhenius factor is

The time required for 100% completion of a zero order reaction is

The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about

In the hydrolysis of an organic chloride in presence of large excess of water, RCl + H₂O → ROH + HCl

Radioactivity of a sample (z = 22) decreases 90% after 10 years. What will be the half-life of the sample?

The rate constant of a first order reaction depends on the

a catalyst is a substance which

The time taken for 10% completion of a first order reaction is 20 min. Then, for 19% completion, the reaction will take

The rate equation for a reaction: A → B is r = K [A]°. If the initial concentration of the reactant is a mol dm–3, the half life period of the reaction is

For the reaction A + B → products, it is observed that (i) On doubling the concentration of A only, the rate of reaction is also doubled. (ii) On doubling the initial concentration of both A and B, there is change by a factor of 8 in the rate of reaction. The rate of reaction is given by

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)

Which of the following statements for order of reaction is not correct?

The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of reaction with respect to reactant B is

A reaction involving two different reactants can never be

Consider an endothermic reaction, X → Y with activation energies Eb and Ef respectively for the backward and forward reactions, respectively. In general,

t1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If rate constant for a first order reaction is k, then t1/4 can be written as

In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is

The reaction: A → B follows first order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. What is the time taken for conversion of 0.9 mol of A to produce 0.675 mol of B?

Which of the following would NOT increase the rate of reaction

The reaction A + B -> products is found to be second order in [A] and first order in [B]. The rate equation would be:

For a certain reaction, it is found that the rate equation is R = 0.015 L/mol·s[A][B]2. Calculate the rate of the reaction, in mol/L·s, when [A] = 0.022 M and [B] = 0.055 M.

For a certain reaction, it is found that the rate equation is R = 0.015 L/mol·s[A][B]2. Calculate the rate of the reaction, in mol/L·s, when [A] = 0.022 M and [B] = 0.055 M.

For the reaction 2A + 3B + C = Products, the rate equation is

For a certain first order reaction, it is found that it takes 156 seconds for the concentration of reactant to fall from 0.100 M to 0.0500 M. How much time would it take for the concentration of reactant to fall from 0.0500 M to 0.0250 M?

A 1.000 g sample of live grass gives 116 decays per hour of carbon-14. A 1.000 g sample of grass found in an Egyptian tomb gives 34 decays per hour. The half-life of carbon-14 is 5720 years. How old, in years, is the ancient grass?

For a certain reaction, it is found that the equation relating the specific rate constant, k(M/s), and absolute temperature, T, is: lnk = -4420/T + 12.20. What is the value of the specific rate constant, k(M/s) at 500 K?

What is the activation energy, in kJ/mole, for the process described in problem 9?

A catalyst functions by:

The following reaction is found to be first order in H2 (g) and second order in NO (g). The rate law for this reaction is: 2NO (g) + 2H₂-> N₂ (g) + 2H₂O (g)

What is the half-life of phosphine (problem 14) at 680° C?

You would expect the half-life of phosphine at room temperature to be _____ than at 680° C.

The rate law for this reaction is:

Which of the following are reaction intermediates:

Which of the following are catalysts:

For the following reaction DG° is 2.60 kJ/mole at 25° C. The equilibrium constant for this reaction at 25° C is: H₂ (g) + I₂ (g) « 2HI (g)

Reaction rates increase with temperature because as the temperature increases:

A catalyst increases the rate of a reaction by:

What is the order of the reaction in HI?

The half life for the first order decomposition of nitromethane, CH₃NO₂, at 500K is 650 seconds. If the initial concentration of CH₃NO₂ is 0.500M, what will its concentration be (M) after 1300 seconds have elapsed?

What is the rate constant, k (include units)?

What is the rate constant, k (include units)?

The reaction intermediate is:

The rate law consistent with the mechanism is:

Determine the value of the rate constant, k (in sec^-1).

Which of the following plots would be linear if the above data is plotted?

The activation energy (Ea), in kJ/mole, is:

The age of the Shroud of Turin in determined by radiocarbon dating. A Geiger counter measures 14.2 counts per minute (c.p.m.) in a sample of the shroud compared to 15.4 c.p.m. from carbon-14 in a living organism. If the half life is 5760 years, what is the age of the shroud in years? The radioactive decay of carbon-14 follows first order kinetics.

What is the order with respect to A?

What is the numerical value of the rate constant, k?

The catalyst in the above mechanism is:

The intermediate in the above mechanism is:

If the catalyst in question 42 is added to the reactants, the value of the rate constant, k, would be:

The rate law (or rate equation) is:

Determine the molar concentration of A after 140 seconds have elapsed.

The specific rate constant, k, for radioactive beryllium–11 is 0.049 s–1. What mass of a 0.500 mg sample of beryllium–11 remains after 28 seconds?

The slow rate of a particular chemical reaction might be attributed to which of the following?

For a reaction: 2H₂+2NO —–> 2H₂0 + N₂ the rate law is R =K [H₂][NO]² The Order of the reaction is?

The minimum additional energy, above the average internal energy, which the. reacting molecules must possess so that their collision result in a reaction is known as?

2N0₂ + 0₂ ——> P₂ NO₂ The above reaction is:

Which of the following are best to explain the action of negative catalyst in a chemical reaction?

The reactions with the high value of energy of activation are?

The reactions catalyzed by sunlight are called reactions

in a reaction: 2A—->B + 2C, which of the statement is true?

Rusting of iron Is an example of________ reaction

In the reaction: 2B—-> Product If the concentration ‘of ‘B’ is doubled, the rate of reaction will increase by?

In the reaction: 2N0 + O₂ —-> 2NO₂ if the concentration of NO is halved, the rate will decrease by

When one of the products of reaction acts, as catalysts then ‘such a process is called?

In a chemical reaction, only those collisions of molecules are effective in which the colliding molecules possess a minimum amount Of energy called?

Reaction between H₂ and CL₂ occurs in the presence of sunlight. Its rate is independent of concentration of H₂ and Cl₂ so it is order reaction,

Powdered marble reacts more rapidly with HCL than the chips of marble because:

The rate of a reaction increases with the increase of concentration of reactants because?

Molecular reactions have usually?

When one of products is removed from the reaction, the direction of reverse reaction is

In case of Slow reaction, if the temperature is increased by 10 K, then point out the false statement?

Among the following reactions, the fastest one?

The chemical reactions in which reactants require high amount of activation energy Are generally?

The term — dx/dt in the rate expression refers to the?

Which of the following compound is depleting the ozone umbrella?