Question: Which of the following is a correct relation for first order reaction?
A k=r×c2
B k= r×c
C k=c/r
D k=r/c
Answer: k=r/c
| Characteristic | Description |
| Reaction Order | 1st order reaction |
| Rate Law for A → B | A→B with rate
Rate=k[A] |
| Rate Law Expression | k= r/c where r is the rate of reaction and c is the concentration of reactant A. |
| Rate Constant (k) | Represents the rate constant specific to the reaction |
| Concentration Dependence | Rate is directly proportional to the concentration of the reactant (e.g., [A]) |
| Half-Life | t1/2= 0.693/ k |
| Example | Radioactive decay of a substance is a first-order reaction. |