[" The concentration of reactant decreases from "0.2M" to "0.1M" in "10" minutes.The rate "],[" of reaction is "....]

The concentration of a reactant decreases from 0.2 M to 0.1 M in 10 minutes . The rate of the reaction is ______.

The concentration of a reactant decreases from 0.2 M to 0.1 M in 10 minutes . The rate of the reaction is ______.

The concentration of a reactant decreases from 0.2 M to 0.1 M in 10 minutes . The rate of the reaction is ______.

The concentration of reaction decreases from 0.2 M to 0.05 M in 5 minutes. The rate of reaction in mole. "lit"^(-1)."sec"^(-1) is

In a first order reaction, the concentration of the reactant is decreased from 1.0 M to 0.25 M in 20 minute. The rate constant of the reaction would be