In a first order reaction the concentration of reactant decreases from \[800\,mol/d{{m}^{3}}\] to \[50\,mol/d{{m}^{3}}\] is \[2\times {{10}^{2}}\sec \]. The rate constant of reaction in \[{{\sec }^{-1}}\] is [IIT-JEE (Screening) 2003]

In a first order reaction the concentration of reactant decreases from

1.	In a first order reaction the concentration of reactant decreases from \[800\,mol/d{{m}^{3}}\] to \[50\,mol/d{{m}^{3}}\] is \[2\times {{10}^{2}}\sec \]. The rate constant of reaction in \[{{\sec }^{-1}}\] is [IIT-JEE (Screening) 2003]
A.	\[2\times {{10}^{4}}\]
B.	\[3.45\times {{10}^{-5}}\]
C.	\[1.386\times {{10}^{-2}}\]
D.	\[2\times {{10}^{-4}}\]
Answer» D. \[2\times {{10}^{-4}}\]

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In a first order reaction the concentration of reactant decreases from \[800\,mol/d{{m}^{3}}\] to \[50\,mol/d{{m}^{3}}\] is \[2\times {{10}^{2}}\sec \]. The rate constant of reaction in \[{{\sec }^{-1}}\] is [IIT-JEE (Screening) 2003]

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