Home
Class 11
CHEMISTRY
A reaction has a rate constant of 0.25 "...

A reaction has a rate constant of `0.25 "mol"^(-1)` L `s^(-1)` if the initial concentration of the reactant is `0.2` mol `L^(-1)` half life of the reaction is

A

15 s

B

10 s

C

20 s

D

50 s

Text Solution

Verified by Experts

The correct Answer is:
C
From units of rate constant the reaction is of second order. For a second order reaction
`t_(1//2)=(1)/(ka)=((1)/(0.25xx0.2))s`
`=((100xx10)/(25xx2))s=20s`.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • RATES OF REACTIONS AND CHEMICAL KINETICS

    DINESH PUBLICATION|Exercise Assertion or Reason|20 Videos

  • PHYSICAL AND CHEMICAL EQUILIBRIA

    DINESH PUBLICATION|Exercise ULTIMATE PREPARATORY PACKAGE|13 Videos

  • REDOX REACTIONS

    DINESH PUBLICATION|Exercise Reasoning Type Questions|4 Videos

Similar Questions

Explore conceptually related problems

What will be the initial rate of reaction if its rate constant is 10^(-3)s^(-1) and the concentration of the reactant is 0.2 mol L^(-1) ? What fraction of the reactant will be converted into the products in 200 seconds ?

A reaction, which is second order,has a rate constant of 0.002 L mol^(-1)s^(-1) . If the initial cond. Of the reactant is 0.2M . How long will it take for the concentration to become 0.0400M ?

Knowledge Check

  • For a first - order reaction, the rate of reaction is 1.0xx10^(-2) mol L^(-1) s^(-1) and the initial concentration of the reactant is 1 M. The half-life period for the reaction is

    A
    `6.93xx10^(-3)s^(-1)`
    B
    `0.693 s^(-1)`
    C
    `69.3 s`
    D
    `0.693 s^(-1)`

  • The initial rate of a second order reaction is 4xx10^(-4) "mol" L^(-1) s^(-1) and the initial concentration of the reaction substance is 0.20 "mol" L^(-1) the value of rate constant is

    A
    `0.02 L "mol"^(-1) s^(-1)`
    B
    `0.03 L "mol"^(-1) s^(-1)`
    C
    `0.01 L "mol"^(-1) s^(-1)`
    D
    `0.4 L "mol"^(-1) s^(-1)`

  • The rate for a first order reaction is 0.6932 xx 10^(-2) mol.l^(-1) min^(-1) , and the initial concentration of the reactants is 1M, Half life time of the reaction is equal to

    A
    6.932 min
    B
    100 min
    C
    `0.6932 xx 10^(-3) min`
    D
    `0.6932 xx 10^(-2) min`

    • Similar Questions

    Explore conceptually related problems

    The rate constant of a second order reactions 2A rarr Products, is 10^(-4) "lit mol"^(-1) "min"^(-1) . The initial concentration of the reactant is 10^(-2) "mol lit"^(-1) . What is the half life (in min) ?

    The specific rate constant for a first order reaction is 60xx10^(-4) sec^(-1) . If the initial concentration of the reactant is 0.01mol L^(-1) , the rate is

    The rate constant for a gaseous reaction, X(g) rightarrow 2Y(g) is 0 2 mol L^(-1) s ^(-1) . If Initial concentration of the reactant, X is 0.8 mol L ^(-1) which of the following graph is correct?

    The rate constant of a reaction is 0.69 xx 10^(-1) "min"^(-1) and the initial concentration is 0.2 mol l^(-1) . The half - life period is

    The rate of a first order reaction is 1.5 xx 10^(-2) mol L^(-1) "min"^(-1) at 0.5 M concentration of the reactant . The half life of the reaction is

    Home
    Profile