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Engineering
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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 from 0.1 M to 0.025 M is

  • Option 1)

    30 minutes

  • Option 2)

    15 minutes

  • Option 3)

    7.5 minutes

  • Option 4)

    60 minutes.

 
As we learnt in  First Order Reaction - The rate of the reaction is proportional to the first power of the concentration of the reaction - wherein Formula: R            P a                 0 a-x             x   [differentiate rate law] Unit of        for next condition Option 1) 30 minutes Correct option Option 2) 15 minutes Incorrect option Option 3) 7.5 minutes Incorrect...
Engineering
121 Views   |  

The rate equation for the reaction 2A+B\rightarrow C is found to be : rate =k\left [ A \right ]\left [ B \right ]. The correct statement in relation to this reaction is that the

  • Option 1)

    unit of k must be s-1

  • Option 2)

    t_{1/2}  is a constant

  • Option 3)

    rate of formation of C is twice the rate of disappearance of A

  • Option 4)

    value of k is independent of the initial concentrations of A  and  B

 
As we learnt in  First Order Reaction - The rate of the reaction is proportional to the first power of the concentration of the reaction - wherein Formula: R            P a                 0 a-x             x   [differentiate rate law] Unit of       rate= k[A] [B] According to rate law equation order of reaction with respect to A and with respect to B is first order so value of k is...
Engineering
142 Views   |  

The half-­life of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is

  • Option 1)

    1.042 g

  • Option 2)

    2.084 g

  • Option 3)

    3.125 g

  • Option 4)

    4.167 g.

 
As learnt in the concept First Order Reaction - The rate of the reaction is proportional to the first power of the concentration of the reaction - wherein Formula: R            P a                 0 a-x             x   [differentiate rate law] Unit of        Option 1) 1.042 g This option is incorrect.  Option 2) 2.084 g This option is incorrect.  Option 3) 3.125 g This option is...
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