Question

Consider the following statements:
1. Rate of a process is directly proportional to its free energy change.
2. The order of an elementary reaction step can be determined by examining the stoichiometry.
3. The first order reaction describes exponential time course.
Of these statements:

• A. $1,2$ and $3$ are correct
• B. $1$ and $2$ are correct
• C. $2$ and $3$ are correct
• D. $1$ and $3$ are correct

Answer 1

The correct option is C $2$ and $3$ are correct

1. The rate of a process is not directly proportional to its free energy change.
Actually the rate of the process depends on the activation energy.
Higher is the activation energy, lower is the rate of the reaction.

2. The order of an elementary reaction step can be determined by examining the stoichiometry
Thus, $A\to \text{products}$ is a first-order reaction and $2B\to \text{products}$ is a second-order reaction.

3. The first-order reaction describes the exponential time course. It is given by the expression (integrated rate law):

$A=A_0{e}^{-kt}$