Question

For a chemical reaction which can never be a fraction :
(a) rate constant
(b) order
(c) molecularity
(d) half life

Answer 1

the right option is b

Answer 2

Answer: (c) molecularity

Explanation:

Rate constant is equal to the rate of reaction when concentration of the reactant in unity. It can have any value.

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.  It can be zero or fractional too.

Molecularity of the reaction is defined as the number of atoms, ions or molecules that must colloid with one another simultaneously so as to result into a chemical reaction.  Thus it can never be fractional.

Half life is the time taken by a reactant to reduce to its original concentration. It is designated by the symbol $t_\frac{1}{2}$.