Chemical Reaction

Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?

by
Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?

A. Langmuir’s assumption applies to every adsorbed layer
B. There is no dynamic equilibrium between successive layer
C. The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer
(except the first one) is involved in each of the evaporation process
D. None of these

A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are_____________________?

by
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are_____________________?

A. Equal in size
B. Of different sizes
C. Of such size that the ratio of their volumes is < 5
D. None of these

The value of ‘n’ for a chemical reaction A → B, whose reaction rate is → CA n, will be _______________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled?

by
The value of ‘n’ for a chemical reaction A → B, whose reaction rate is → CA n, will be _______________ if the rate of the reaction increases by a factor of 8, when the concentration of is doubled?

A. 0
B. 1
C. 2
D. 3

The first order series reaction as shown in the bellow figure is conducted in a batch reactor. The initial concentrations of A, B and C (CA0, CB0, CC0 respectively) are all non-zero. The variation of CB with reaction time will not show a maximum, if___________________?

by
The first order series reaction as shown in the bellow figure is conducted in a batch reactor. The initial concentrations of A, B and C (CA0, CB0, CC0 respectively) are all non-zero. The variation of CB with reaction time will not show a maximum, if___________________?

A. k2 CB0 > k1 CA0
B. k CA0 > k2.CB0
C. CB0 > CA0
D. CA0 > CB0

In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?

by
In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?

A. More than
B. Less than
C. Same as
D. Data insufficient; can’t be predicted