Question

The unit of rate constant for a given reaction is ${M^{1 - n}}{L^{n - 1}}{t^{ - 1}}$ where n is order of reaction.
A.True
B.False

Answer 1

We need to know that the rate constant is also known as proportionality constant and it can be explain on the basis of rate of a chemical reaction and the molar concentration of the reactants. The rate constant of a reaction is expressed by ‘k’ and t is also called reaction rate coefficient. And according to chemical kinetics, the rate constant will express the direction and rate of the chemical reaction.

Complete answer:
The given statement is true. Because, if the unit of rate constant for a given reaction is equal to ${M^{1 - n}}{L^{n - 1}}{t^{ - 1}}$ where n is order of reaction. Generally, it express the rate constant. In a chemical reaction, the rate are always expressed in terms of concentrations units over the unit of time. And the rate constant units is mainly depends on the order of a reaction and the concentration of a reaction is equal to time in seconds and molarity. The unit of the rate constant mainly depends the order of the overall reaction.
For example, the unit of zero order reaction is equal to M/s and the unit of first order reaction is equal to $\dfrac{1}{s}$ and unit of second order reaction is equal to $\dfrac{1}{{Ms}}$.

Note:
If the unit of rate constant for a given reaction is equal to ${M^{1 - n}}{L^{n - 1}}{t^{ - 1}}$ where n is order of reaction. According to the rate law, it express how the rate of chemical reaction will depends the concentration of the reactant. The order of the rate law is equal to the sum of exponents in the term of concentration. And the concentration directly depends the rate of reaction.