Chemistry Reaction Kinetics BUMHS 2022
PMDC Verified Question 39 of 80
Rate of reaction when the reactant's concentration is taken as unity is called?
A
Arrhenius constant
B
Specific rate constant
C
Ideal rate constant
D
Molecularity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Specific rate constant
Concept:

The rate constant (\( k \)) is the proportionality constant in the rate law equation.

Formula:

$$ \text{Rate} = k[\text{A}]^{n} $$

Solution:

  • If the concentration of all reactants is exactly 1 (unity), the concentration terms evaluate to 1.
  • $$ \text{Rate} = k(1)^{n} = k $$
  • When this condition is met, the rate of the reaction mathematically equals the rate constant.
  • In standard chemical terminology, this specific condition defines \( k \) as the specific rate constant or velocity constant.


Why other options are incorrect:

Arrhenius constant refers to the pre-exponential factor (\( A \)). Molecularity is the number of colliding molecules. 'Ideal rate constant' is not a standard chemical term.

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