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

In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration of to change from 0.1 M to 0.025 M is

A

30 min

B

15 min

C

7.5 min

D

60 min

Text Solution

Verified by Experts

The correct Answer is:
A
`t_(1//2) = 15 min `
` 0.025 = 0.1 ((1)/(2))^n or ( 0.025 )/( 0.1 ) = (1/2)^n or 1/4 = (1/2)^n " " therefore n=2`
time required `= 2 xx 15 = 30 `min
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL KINETICS

    ICSE|Exercise EXERCISE (PART- I (OBJECTIVE QUESRTIONS) C. CORRECT THE FOLLOWING STATEMENTS BY CHANGING THE UNDERLINED PART OF THE STATEMENT ( DO NOT CHANGE THE WHOLE SENTENCE .)) |39 Videos

  • CHEMICAL KINETICS

    ICSE|Exercise EXERCISE (PART- I (OBJECTIVE QUESRTIONS) D. MATCH THE FOLLOWING ) |3 Videos

  • CHEMICAL KINETICS

    ICSE|Exercise EXERCISE (PART- I (OBJECTIVE QUESRTIONS)A.FILL IN THE BLANKS) |54 Videos

  • BIOMOLECULES

    ICSE|Exercise ISC EXAMINATION QUSTIONS (PART-I)(DESCRIPTIVE QUESTIONS)|21 Videos

  • CHEMISTRY IN EVERYDAY LIFE

    ICSE|Exercise EXERCISE (PART - II (DESCRIPTIVE QUESTIONS) (LONG ANSWER QUESTIONS))|19 Videos

Similar Questions

Explore conceptually related problems

In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change form 0.1 M to 0.025 M is :

In a first order reaction, the concentration of the reactant decreases form 0.8 M to 0.4 M in 15 min . The time taken for the concentration to change form 0.1 M to 0.025 M is

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

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

For a reaction R to P , the concentration of a reactant changes from 0.05 M to 0.04 M min 30 minutes. What will be average rate of reaction in minutes?

The half-life period of a first order reaction is 20 minutes. The time required for the concentration of the reactant to change from 0.16 M to 0.02 M is :

For a certain first order reaction, the concentration of the reactant decreases to nine-tenth of its initial value in ten minutes. Concentration of the reactant after 30 minutes from start will be :

For a reaction Rto P , the concentration of a reactant changes from 0.03 M to 0.02M in 25 minutes. Calculate the average rate of the reaction using the units of seconds.

In a reaction 2X to Y , the concentration of X decreases from 3.0 mole/litre to 2.0 moles/litre in 5 minutes. The rate of reaction is

Decompsition of H_(2)O_(2) follows a frist order reactions. In 50 min the concentrations of H_(2)O_(2) decreases from 0.5 to 0.125 M in one such decomposition . When the concentration of H_(2)O_(2) reaches 0.05 M, the rate of fromation of O_(2) will be

ICSE-CHEMICAL KINETICS-EXERCISE (PART- I (OBJECTIVE QUESRTIONS)B.COMPLE THE FOLLOWING STATEMENTS BY SELECTING THE CORRECT ALTERNATIVE FROM THE CHOICES GIVEN )
  1. A first order reaction is 50% completed in 1.26 xx 10^(14)s. How much ...

    Text Solution

    |

  2. Compounds 'A' and 'B' react according to the following chemical eq...

    Text Solution

    |

  3. Which of the following statements is not correct for the catalyst ?

    Text Solution

    |

  4. The value of rate constant of a pseudo first order reaction

    Text Solution

    |

  5. Consider the reaction A to B. The concentration of both the reactan...

    Text Solution

    |

  6. The time of completion of 90% of a first order reaction is approximate...

    Text Solution

    |

  7. The rate law for the reaction 2N2 O5 to 4NO2 + O2 is

    Text Solution

    |

  8. At any stage of the reaction 3A to2B, the reaction rate +(dB )/(dt) wi...

    Text Solution

    |

  9. For the reaction system : 2NO(g) + O2(g) ------>2NO2(g),volume is sudd...

    Text Solution

    |

  10. In respect of the equation k = Ae^(-Ea //RT) in chemical kinetics, whi...

    Text Solution

    |

  11. The time taken for the completion of 3/4 of a first order reaction is

    Text Solution

    |

  12. For a reaction A+B to C + D, if concentration of A is doubled without ...

    Text Solution

    |

  13. The half-life of a reaction is halved as the initial concentration of ...

    Text Solution

    |

  14. The reaction X to Product follows first order kinetics. In 40 minutes...

    Text Solution

    |

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

    Text Solution

    |

  16. The rate equation for the reaction 2A+B to C is found to be : rate = ...

    Text Solution

    |

  17. The rate of first order reaction is 1.5 xx 10^(-2) mol L^(-1) min ^(-1...

    Text Solution

    |

  18. The half-lives of 2 samples are 0.1 and 0.4 seconds. Their initial con...

    Text Solution

    |

  19. The velocity constant of a reaction at 290 K was found to be 3.2 xx 10...

    Text Solution

    |

  20. For a first order reaction A to B the reaction rate at reactant conc...

    Text Solution

    |