In a first order reaction,the concentration of the reactants decreases…………………………..with time (linearly or eponentially or sinusoidally).

For a first order reaction, the concentration of reactant :

In a first order reaction fraction of the total concentration of the reactant varies with time 't' is equal to

In a first order reaction, the concentration of the reactant decreases form 0.8 M to 0.4 M in 15 min . The time taken for the concentration to change form 0.1 M to 0.025 M is

In a first order reaction, the concentration of the reactant decreases form 0.8 M to 0.4 M in 15 min . The time taken for the concentration to change form 0.1 M to 0.025 M is

Assertion :For a first order reaction, the concentration of the reactant decreases exponentially with time. Reason: Rate of reaction at any time depends upon the concentration of the reactant at that time.