Question

Consider the following statements:
1. The rate of reaction is always proportional to the concentration of reactants.
2. The order of an elementary chemical reaction step can be determined by examining its stoichiometry.
3. The first order reactions follow an 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

Answer: (C)

2 and 3 are correct

Proportionality between rate and concentration depends on the order of the reaction.

For an elementary reaction, the order can be determined by its stoichiometry.

For first order reaction, $A_t=A_0{e}^{-kt}$, this is an exponential variation of concentration with time.