Home
Class 12
CHEMISTRY
In a first order reaction, the concentra...

In a first order reaction, the concentration of reactant decreases from 0.8 mol/`dm^(3)` to 0.05 mol/`dm^(3)` in `2 xx 10^(4)` sec. The rate constant in `sec^(-1)` is:

A

`2xx10^(4)`

B

`3.45 xx10^(-5)`

C

`1.386 xx10^(-4)`

D

`2xx10^(-4)`

Text Solution

Verified by Experts

The correct Answer is:
C
`k=(2.303)/(t) log (c_(0))/(C )=(2.303)/(2xx10^(4))=1.386 xx10^(-4) sec^(-1)`
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    BRILLIANT PUBLICATION|Exercise LEVEL I|55 Videos

  • CARBOXYLIC ACIDS

    BRILLIANT PUBLICATION|Exercise LEVEL-II (Assertion -Reason)|4 Videos

  • CO-ORDINATION COMPOUNDS AND ORGANOMETALLICS

    BRILLIANT PUBLICATION|Exercise Level-II (Assertion- Reason)|4 Videos

Similar Questions

Explore conceptually related problems

In a reaction 2A + B to 3C , the concentration of A decreases from 0.5 mol L^(-11) to 0.3 mol L^(-1) in 10 minutes. The rate of production of 'C during this period is:

In a reaction , 2Ato product, the concentration of A decreases from 0.5 mol L^(-1) to 0.4 mol L^(-1) in 10 minutes. Calculate the rate during this interval.

For a first-order reaction A rarr Products, the concentration of A changes from 0.1 M to 0.025 M in 40 min. The rate of the reaction when the concentration of A is 0.01 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.

Identify the order of a reaction if the units of its rate constant is L mol^-1s^-1

A first order reaction with respect to reactant A has a rate constant 6.5 min^(-1) . If we start with 2.0 mol L^(-1) of A when would A reach the value 0.5 mol L^(-1)

The rate law for the reaction below is given by the expression k[A][B] A + B to product. If the concentration of B is increased from 0.1 to 0.3 mol, keeping the value of A at 0.1 mol, the rate constant will be

BRILLIANT PUBLICATION-CHEMICAL KINETICS -LEVEL II
  1. The reaction A rarrB+C has rate constant 1xx10^(-3) Ms^(-1). If one s...

    Text Solution

    |

  2. For an endothermic reaction where DeltaH represents the enthalpy of re...

    Text Solution

    |

  3. In a first order reaction, the concentration of reactant decreases fro...

    Text Solution

    |

  4. For the elementary reaction M rarr N, the rate of disappearance of M ...

    Text Solution

    |

  5. According to the collision theory of chemical reactions

    Text Solution

    |

  6. The activation energy for a simple chemical reaction A rarr B is E(a) ...

    Text Solution

    |

  7. The reaction 2NO(g)+O(2)(g)rarr2NO(2)(g) is of first order. Ifvolume ...

    Text Solution

    |

  8. For the equilibrium, A(g)rarrB(g), triangleH is - 40 kJ mol^(-1) . If ...

    Text Solution

    |

  9. The rate law for a reaction between the substances A and B is given by...

    Text Solution

    |

  10. The kinetic data for the given reaction A (g) + 2 B (g) overset(k)rarr...

    Text Solution

    |

  11. Reaction A + B rarr C + D follows rate law, r = k[A]^(1//2) [B]^(1//2)...

    Text Solution

    |

  12. The reaction A(g) rarr B(g) + 2C(g) is a first order reaction with ra...

    Text Solution

    |

  13. For a first order homogenous gaseous reaction A rarr2B +C if the tota...

    Text Solution

    |

  14. The gaseous decomposition reaction, A(g) rarr 2B(g) + C(g) is observed...

    Text Solution

    |

  15. A gaseous compound A reacts by three independent first order processes...

    Text Solution

    |

  16. A compound 'A' dissociate by two parallel first order paths atcertain ...

    Text Solution

    |

  17. The reaction cis- X underset(k(b))⇌overset(k(f)) trans-X is first o...

    Text Solution

    |

  18. For first order parallel reactions k(1) and k(2) are 4 and 2 min^(- ...

    Text Solution

    |

  19. Consider the following first order competing reactions: X overset(k(...

    Text Solution

    |

  20. A reactant (A) forms two products (Assume that A(1) = A(2) , which are...

    Text Solution

    |