A. Lose a proton
B. Gain a proton
C. Lose an electron
D. None of these
Related Mcqs:
- A reaction which is catalysed by a base is catalysed by all substances which have a tendency to_______________________?
A. Lose a proton
B. Gain a proton
C. Gain an electron
D. None of these - Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?
A. 0
B. 1
C. 2
D. 3 - Kinetics of a solid catalysed reaction can best be studied in a _________________ reactor?
A. Batch
B. Plug-flow
C. Mixed
D. None of these - If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst___________________?
A. Porosity is very important
B. Porosity is of less importance
C. Internal surface area is utilised efficiently
D. None of these - The effectiveness factor for large value of Thiele modulus [L√(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?
A. L √(K/D1)
B. 1/[L√(K/D1)]
C. 1
D. ∞ - 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 - In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for________________?
A. Fast reactions in catalyst of small pore diameter
B. Fast reaction in catalyst of large pore diameter
C. Slow reactions in catalyst of small pore diameter
D. Slow reactions in catalyst of large pore diameter - For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the ______________ adsorption?
A. Physical
B. Chemical
C. Both A. and B.
D. Neither A. nor B. - For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?
A. Fixed
B. Fluidised bed reactor followed by a fixed
C. Fixed bed reactor followed by a fluidised
D. Fluidised - For a vapour phase catalytic reaction (A + B → P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?
A. -rA = (k . PA . PB)/(1 + KAPA + KPPP)
B. -rA = (k . PA
2 – k1PP)/(1 + KAPA + KPPP)
C. -rA = (k . PA . PB)/(1 + KAPB + KBPB . KPPP)
D. -rA = (k . PA . PB)/(1 + KAPA)
