Chemical Engineering Subcategories

Chemical Engineering	Chemical Reaction
Polymer Technology	Fuels and Combustion
Refractory Technology	Fluid Mechanics for Chemical
Thermodynamics for Chemical	Materials and Construction
Fertilizer Technology	Chemical Environmental Engineering

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

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

Participation of _______________ is involved in the occurrence of a chemical reaction?

A. Protons
B. Neutrons
C. Electrons
D. None of these

A photochemical reaction is _______________ light?

A. Initiated by
B. Accompanied with emission of
C. Catalysed by
D. Used to convert heat energy into

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

________________ resistance is not involved in the combustion of a carbon particle?

A. Gas film
B. Ash
C. Chemical reaction
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_____________________?

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

An example of autothermal reactor operation is______________________?

A. Sulphur dioxide oxidation
B. Ethylene oxidation
C. Benzene oxidation
D. Ammonia synthesis

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

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