Search
.Management Sciences
Category: Chemical Reaction
Which of the following factors control the deactivation of a porous catalyst pellet?
A. Decay reactions
B. Pore diffusion
C. Form of surface attack by poison
D. All A., B. and C.
Space time in flow reactor is____________________?
A. Usually equal to the residence time
B. The reciprocal of the space velocity
C. A measure of its capacity
D. Both A. and B.
Collision theory gives the rate constant for bimolecular reaction as___________________?
A. K α √T.e-E/RT
B. K α eE/RT
C. K α e-E/RT
D. None of these
Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.) ?
A. Reactor dispersion number (D/vL)
B. Reduced time (vt/V)
C. Thiele modulus L √(k/D1)
D. None of these
For the reaction, A + B → 2B + C,___________________?
A. rA = rB
B. rA = -rB
C. rA = 2rB
D. rA = rB/2
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an _______________ reaction?
A. Elementary
B. Non-elementary
C. Parallel
D. Autokinetic
For the irreversible elementary reactions in parallel as shown in the bellow figure, the rate of disappearance of ‘X’ is equal to_______________?
A. CA (K1 + K2)
B. CA (K1 + K2)/2
C. CA . K1/2
D. CA . K2/2
Promoter_____________________?
A. Initiates a chemical reaction and is a catalyst by itself
B. Alters the position of equilibrium in a reversible reaction
C. Increases the number of active centres by increasing the unevenness of catalyst surface and by
creating discontinuities in the crystals
D. All A., B. and C.
A reaction in which one of the products of reaction acts as a catalyst is called a/an ______________ reaction?
A. Catalytic
B. Autocatalytic
C. Photochemical
D. None of these
Recent Comments