Hello!!!

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Zero Order reaction is that in which rate of the reaction does not depend upon the concentration of reactant.

Rate = K [A]^n

here n=0

Rate = K [A]^0

_d[A]/dt =K

-d[A] = Kdt

d[A] = -Kdt

Integrating on both sides

A ...............t

∫  d[A] = -  ∫  Kdt

Ao.............0

[A]-[Ao]=-Kt

[A]=[Ao]-Kt

[At]=-Kt+[Ao]

Half life....

[A]=[Ao]/2    and t=t/2

[Ao]/2 = [Ao] -K t/2

1/2 [Ao] = K t/2

[Ao]/2K = t/2

Hope it helps!!!!