If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the ________________ diffusion?
A. Film
B. Ash layer
C. Pore
D. None of these
Month: February 2019
Variables affecting the rate of homogeneous reactions are___________________?
Variables affecting the rate of homogeneous reactions are___________________?
A. Pressure and temperature only
B. Temperature and composition only
C. Pressure and composition only
D. Pressure, temperature and composition
In a zero order reaction, reactants concentration does not change with time and the_________________?
In a zero order reaction, reactants concentration does not change with time and the_________________?
A. Time for half change is half the time taken for completion of the reaction
B. Time for half change is independent of the initial concentration
C. Time for completion of the reaction is independent of the initial concentration
D. Reaction rate is trebled when the initial concentration is trebled
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is___________________?
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is___________________?
A. More
B. Less
C. Same
D. Either A. or B., depends on other factors
Volume change for unimolecular type first order reaction as shown in the bellow figure, increases _____________ with time?
Volume change for unimolecular type first order reaction as shown in the bellow figure, increases _____________ with time?
A. Linearly
B. Exponentially
C. Parabolically
D. Logarithmically
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 ?
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
An example of autothermal reactor operation is______________________?
An example of autothermal reactor operation is______________________?
A. Sulphur dioxide oxidation
B. Ethylene oxidation
C. Benzene oxidation
D. Ammonia synthesis
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 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
________________ resistance is not involved in the combustion of a carbon particle?
________________ resistance is not involved in the combustion of a carbon particle?
A. Gas film
B. Ash
C. Chemical reaction
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?
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