Question

Assertion:
Temperature coefficient of a one-step reaction may be negative.
Reason:
The rate of reaction having a negative order with respect to a reactant decreases with the increase in the concentration of reactant
(A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
(B) Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion
(C) Assertion is correct but Reason is false
(D) Assertion is false but Reason is correct
(E) both Assertion and Reason are false

Answer 1

Hint: The order of reaction refers to the relationship between the rate of a chemical reaction and the concentration of the species taking part in it. According to the rate law, the power dependence of rate on the concentrations of all reactants is the order of that chemical reaction. the reaction order applicable for all chemical reactions.

Complete step by step answer:
Depending on the experimental conditions, the rate of reaction changes as the concentration of reactants, pressure in cases of gases, temperature, and catalyst.
The ratio of the rate constants of two temperatures differs by ${{10}^{0}}C$ is known as the temperature coefficient of the reaction. The rate of reaction is doubled when every ${{10}^{0}}C$ temperature rise.
Hence, the Assertion is a false statement.
A negative order of a reaction means the rate of the reaction decreases when the concentration of the substance is increased.
Hence, the reason stated is correct. The rate of reaction having a negative order concerning a reactant decreases with the increase in the concentration of reactant
So, Assertion is false but Reason is correct.
So, the correct answer is “Option D”.

Note: The temperature coefficient is a measure of temperature sensitivity of chemical reaction rates and biological processes. The negative temperature coefficient is possible when the elementary reactions are examined from the standpoint of transition state theory and collision theory. The value of temperature coefficient of rate constant of reaction varies from 2-3.