A chemical
reaction is said to be of first order reaction if its rate is determined by the
change of one of the concentration term only.

Consider a
general chemical reaction its follow first order kinetics

**Let [A]**=initial concentration of reactant A

_{0}**[A]**= concentration of after time t

_{t}**[B]**= concentration of product B after time t

_{t}
On
Integration of above equation

On rearrangement equation (1) give equation of straight line

We can also write equation (1) as

**Case (1):**

**#**On increasing angle (slop) the value of reaction constant increases hence k3>k2> k1

**Case (2):**

**Case (3):**

**Case (4):**

**[A]t/[A]0 Vs t :**

**Variation o f concentration with time:****Characteristic of 1**

^{st}order:**(1)**Concentration of reactant left after regular time interval of time will constitute a geometrical progression (GP).

**(2)**A first order reaction takes infinite time for completion.

**(3)**All radioactive disintegrations are examples of first order reaction

**(4)**Decomposing of H

_{2}O

_{2}, Ester and Inversion of sugar are examples of first order reactions

**(5)**Half life time of first order reaction does not depend upon initial concentration.

**Similarly concentration of product B after time t**

Graph show increase in concentration of [B] and [A] both as exponential manner.

**Half life time of first Order reaction:**

**Natural life time of first order reaction**:

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