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Specific Rate Constant MDCAT MCQs with Answers

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Welcome to the Specific Rate Constant MDCAT MCQs with Answers. In this post, we have shared Specific Rate Constant Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Chemistry offers a chance to enhance your knowledge regarding Specific Rate Constant MCQs in this MDCAT Online Test.

The specific rate constant $k$ is independent of: a) Concentration b) Temperature c) Catalyst d) Reaction mechanism
Answer
a
The units of the specific rate constant kkk depend on: a) The concentration of reactants b) The order of the reaction c) The temperature d) The activation energy
Answer
b
For a first-order reaction, the specific rate constant $k$ has units of: a) mol/L·s b) L·mol⁻¹·s⁻¹ c) 1/s d) L²·mol⁻²·s⁻¹
Answer
c
The specific rate constant kkk for a reaction increases with: a) Decreasing temperature b) Increasing concentration of reactants c) Addition of an inhibitor d) Increasing temperature
Answer
d
The specific rate constant $k$ is: a) A universal constant for all reactions b) The same for all reactions of the same order c) Dependent on the temperature d) Independent of the reaction mechanism
Answer
c
For a zero-order reaction, the specific rate constant $k$ has units of: a) mol/L·s b) L·mol⁻¹·s⁻¹ c) 1/s d) L²·mol⁻²·s⁻¹
Answer
a
In the Arrhenius equation, the specific rate constant $k$ is related to: a) Activation energy b) Frequency factor c) Temperature d) All of the above
Answer
d
The specific rate constant $k$ for a second-order reaction with respect to one reactant has units of: a) mol/L·s b) L·mol⁻¹·s⁻¹ c) 1/s d) L²·mol⁻²·s⁻¹
Answer
b
The rate law for a reaction is given by $Rate=k[A][B]\text{Rate} = k[A][B]$ . Here, kkk represents the: a) Equilibrium constant b) Rate constant c) Reaction order d) Activation energy
Answer
b
The specific rate constant $k$ can be determined experimentally by: a) Measuring the rate of reaction b) Measuring the concentration of reactants c) Both a and b d) Measuring the temperature
Answer
c
If the reaction order increases, the units of the specific rate constant $k$ : a) Increase in complexity b) Decrease in complexity c) Remain the same d) Are unrelated to reaction order
Answer
a
For a third-order reaction, the specific rate constant $k$ has units of: a) mol/L·s b) L·mol⁻¹·s⁻¹ c) L²·mol⁻²·s⁻¹ d) L²·mol⁻²·s⁻¹
Answer
d
The relationship between the specific rate constant $k$ and temperature is given by: a) Van’t Hoff equation b) Arrhenius equation c) Gibbs free energy equation d) Boyle’s law
Answer
b
The specific rate constant $k$ for a reaction of order zero is independent of: a) Temperature b) Concentration c) Reaction mechanism d) None of the above
Answer
b
The units of $k$ for a second-order reaction with two different reactants are: a) L·mol⁻¹·s⁻¹ b) L²·mol⁻²·s⁻¹ c) mol/L·s d) 1/s
Answer
a
For a reaction with the rate law $Rate=k[A]2[B]\text{Rate} = k[A]^2[B]$ , the specific rate constant $k$ has units of: a) L²·mol⁻²·s⁻¹ b) L·mol⁻¹·s⁻¹ c) mol/L·s d) 1/s
Answer
a
The specific rate constant kkk can be affected by: a) Pressure b) Volume c) Temperature d) All of the above
Answer
c
In a first-order reaction, the specific rate constant $k$ is equal to: a) The half-life of the reaction b) The inverse of the half-life c) The slope of the concentration vs. time graph d) The slope of the ln(concentration) vs. time graph
Answer
d
The specific rate constant kkk for a reaction with the rate law Rate=k[A]3[B]\text{Rate} = k[A]^3[B] $Rate = k [A]^{3} [B]$ has units of: a) L²·mol⁻²·s⁻¹ b) L³·mol⁻³·s⁻¹ c) L·mol⁻¹·s⁻¹ d) mol/L·s
Answer
b
The specific rate constant kkk is proportional to the: a) Number of molecules in a reaction b) Activation energy of the reaction c) Frequency of effective collisions d) Pressure of the system
Answer
c
The units of $k$ for a zero-order reaction are: a) mol/L·s b) L·mol⁻¹·s⁻¹ c) L²·mol⁻²·s⁻¹ d) 1/s
Answer
a
The specific rate constant $k$ in the rate law is often referred to as the: a) Pre-exponential factor b) Rate-determining step c) Frequency factor d) Proportionality constant
Answer
d
For a second-order reaction, the units of the specific rate constant $k$ are: a) mol/L·s b) L·mol⁻¹·s⁻¹ c) L²·mol⁻²·s⁻¹ d) 1/s
Answer
b
The specific rate constant $k$ for a first-order reaction depends on: a) The concentration of reactants b) The temperature c) The volume of the system d) The pressure of the system
Answer
b
The units of the specific rate constant $k$ for a reaction of order 2 with respect to a single reactant are: a) L·mol⁻¹·s⁻¹ b) L²·mol⁻²·s⁻¹ c) mol/L·s d) 1/s
Answer
b
For a zero-order reaction, the rate is: a) Independent of the specific rate constant b) Directly proportional to the specific rate constant c) Inversely proportional to the specific rate constant d) Quadratically related to the specific rate constant
Answer
b
The specific rate constant $k$ is directly proportional to: a) Concentration b) Temperature c) Pressure d) Volume
Answer
b
The rate law $Rate=k[A]2[B]1\text{Rate} = k[A]^2[B]^1$ indicates the reaction is: a) First order b) Second order c) Third order d) Zero order
Answer
c
The specific rate constant $k$ for a first-order reaction is independent of: a) The concentration of reactants b) The temperature c) The time d) The activation energy
Answer
a
The specific rate constant $k$ for a reaction where $Rate=k[A]3\text{Rate} = k[A]^3$ has units of: a) L²·mol⁻²·s⁻¹ b) L³·mol⁻³·s⁻¹ c) L·mol⁻¹·s⁻¹ d) mol/L·s
Answer
b
The specific rate constant $k$ is primarily dependent on: a) The concentration of the reactants b) The nature of the reactants c) The physical state of the reactants d) The temperature
Answer
d
The specific rate constant $k$ for a reaction where $Rate=k[A]2[B]2\text{Rate} = k[A]^2[B]^2$ has units of: a) L²·mol⁻²·s⁻¹ b) L⁴·mol⁻⁴·s⁻¹ c) L·mol⁻¹·s⁻¹ d) mol/L·s
Answer
b
In a reaction, a higher specific rate constant $k$ indicates: a) A slower reaction b) A faster reaction c) No change in reaction speed d) A reversible reaction
Answer
b
The specific rate constant $k$ for a third-order reaction with two reactants has units of: a) L·mol⁻¹·s⁻¹ b) L²·mol⁻²·s⁻¹ c) L³·mol⁻³·s⁻¹ d) mol/L·s
Answer
c
The rate constant $k$ is expressed in terms of: a) Number of molecules b) Number of moles c) Concentration and time d) Volume and pressure
Answer
c
For a reaction with the rate law $Rate=k[A][B]2\text{Rate} = k[A][B]^2$ , the specific rate constant $k$ has units of: a) L·mol⁻¹·s⁻¹ b) L²·mol⁻²·s⁻¹ c) L³·mol⁻³·s⁻¹ d) mol/L·s
Answer
b
The specific rate constant $k$ for a zero-order reaction is dependent on: a) The temperature b) The concentration of reactants c) The pressure d) The time
Answer
a
The specific rate constant $k$ in the equation $Rate=k[A][B]2\text{Rate} = k[A][B]^2$ is independent of: a) Time b) Concentration of A c) Concentration of B d) Reaction order
Answer
a
The specific rate constant kkk is usually determined by: a) Calculating the Gibbs free energy b) Measuring the reaction rate c) Observing the change in pressure d) Calculating the entropy change
Answer
b
The specific rate constant $k$ for a reaction where $Rate=k[A]4[B]\text{Rate} = k[A]^4[B]$ has units of: a) L⁵·mol⁻⁵·s⁻¹ b) L⁴·mol⁻⁴·s⁻¹ c) L²·mol⁻²·s⁻¹ d) mol/L·s
Answer
a

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