Promoter is added to the catalyst to improve its____________________?
A. Porosity
B. Sensitivity
C. Surface area
D. None of these
Chemical Reaction
A batch reactor is characterised by ____________________?
A batch reactor is characterised by ____________________?
A. Constant residence time
B. Variation in extent of reaction and properties of the reaction mixture with time
C. Variation in reactor volume
D. Very low conversion
Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?
Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?
A. k. t = ln a/(a – x)
B. k. t = x/a (a – x)
C. k. t = ln (a – x)/a
D. k. t = ln a (a – x)/x
What is the maximum possible value of FR(mole/sec.) ?
What is the maximum possible value of FR(mole/sec.) ?
A. 1/3
B. 1/2
C. 2/3
D. 2
A second order reaction of the form A + B → C is called a pseudo-first order reaction, when____________________?
A second order reaction of the form A + B → C is called a pseudo-first order reaction, when____________________?
A. CA0 = CB0
B. CA0 > CB0
C. CB0 > CA0
D. CB0 ≥ CB0
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________?
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________?
A. 1/2
B. 1/3
C. 1/4
D. 1/5
A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?
A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?
A. Less than
B. Equal to
C. More than
D. Equal to or more than
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the _______________ is the controlling resistance?
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the _______________ is the controlling resistance?
A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either A., B. or C.
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?
A. keff = k + kg
B. keff = (k+ kg)/2
C. keff = (kkg)1/2
D. 1/keff = 1/k + 1/kg
Decomposition rate of a liquid ‘X’ which decomposes as per the reaction as shown in the bellow figure is given by________________?
Decomposition rate of a liquid ‘X’ which decomposes as per the reaction as shown in the bellow figure is given by________________?
A. K1 . CX
B. (K1 + K2 + K3) CX
C. (K1 + K2) CX
D. (K2 + K3) CX