The rate equation for a reaction: A arrow B is r = K[A]°. If the initial concentration of the reactant is a mol dm-3, the half life period of the reaction is

Question

The rate equation for a reaction: A arrow B is r = K[A]°. If the initial concentration of the reactant is a mol dm-3, the half life period of the reaction is (A)  (a /K) (B)  (2a /K) (C)  (a /2K) (D)  (K /a)

Tardigrade Admin · Accepted Answer

A longrightarrow B ∵ r=k[A]0 or r=k This is a zero order reaction. ∴ t1 / 2=(a/2 k)

Q. The rate equation for a reaction : $A \to B$ is $r = K [A]^{\circ}$ . If the initial concentration of the reactant is a mol $d m^{- 3}$ , the half life period of the reaction is

$\frac{a}{K}$

$\frac{2 a}{K}$

$\frac{a}{2 K}$

$\frac{K}{a}$

$A ⟶ B$

$∵ r = k [A]^{0}$

or $r = k$

This is a zero order reaction.

$∴ t_{1/2} = \frac{a}{2 k}$

Q. The rate equation for a reaction : A→B is r=K[A]∘. If the initial concentration of the reactant is a mol dm−3, the half life period of the reaction is

Ka​

K2a​

2Ka​

aK​