What is Rate of a reaction

1.	What is Rate of a reaction
Answer» Rate of reaction : The [speed or velocity] of a reaction is the change in concentration of reactants or products per unit time. Rate `(Deltax)/(Deltat)` Where, `Deltax` is the change in concentration,` Deltat` is the time interval. The rate of reaction is always positive and it decreases as the reaction proceeds. For the reaction,` R to P,` rate may be expressed as a) Rate of disappearance of `R=("Decrease in concentration of R")/("Time taken for the decrease")=-(DeltaR)/(Deltat)` b) Rate of appearance of `P=("Increase in concentration of R")/("Time taken for the increase")=+ (DeltaP )/(Deltat)`

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Define molar conductivity of a solution and explain how molar conductivity changes with change in concentration of a solution for a weak and a strong electrolyte.
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What are elementary reactions ?

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