Question

The value of rate constant of a pseudo first order reaction ______.

पर्याय

• depends on the concentration of reactants present in small amount.

• depends on the concentration of reactants present in excess.

• is independent of the concentration of reactants.

• depends only on temperature.

Answer 1

The value of rate constant of a pseudo first order reaction depends on the concentration of reactants present in excess.

Explanation:

Let's start with what a pseudo-first-order response is.

Although the pseudo-first-order reaction looks to be an order, it belong to another order. it's a second-order reaction because it involves two reactants.

Let's have a look at a reaction.

\[\ce{CH3Br + OH -> CH3OH + Br}\]

So, the rate law for the reaction is 

Rate = \[\ce{k[OH][CH3Br]}\]

Rate = \[\ce{k[OH][CH3Br] = k(constant) [CH3Br] = K' [CH3Br]}\]

Only the concentration of \[\ce{CH3Br}\] will change during the reaction and the rate will be determined by the reaction's modifications.