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Engineering
321 Views   |

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 $\dpi{100} 2A+B\rightarrow C$ is found to be : rate $\dpi{100} =k\left [ A \right ]\left [ B \right ].$ 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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