Test: Reaction Order & Elementary Rate Law - Chemistry MCQ

The above single step reaction is an elementary reaction. Molecularity is the number of molecules participating in the reaction.

Elementary reactions are the ones with single reaction step and the reaction rate corresponds to stoichiometric equation.

Relative rate of reaction can be obtained from the ratio of stoichiometric co -efficient.

Order is empirical, hence can be a fractional value but molecularity refers to the mechanism and is applicable only for elementary reactions.

The reaction rate constant depends on temperature only.

Order is equal to molecularity when reaction is elementary.

General expression for the rate constant is time^-1 concentration^(1-n).

Order w.r.t A is 0.7 and B is 1.3.Hence, Overall order is 2.

Elementary reaction occurs in single reaction step with no intermediates and molecularity is the number of particles involved in the reaction.