A. Initiates a reaction
B. Lowers the activation energy of reacting molecules
C. Is capable of reacting with any one of the reactants
D. Cannot be recovered chemically unchanged at the end of a chemical reaction
Related Mcqs:
- 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 - For all positive reaction orders for a particular duty ?
A. Mixed reactor is always larger than the plug-flow reactor
B. Ratio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order
C. Reactor size is independent of the type of flow
D. Density variation during reaction affects design - ‘n’ number of plug flow reactors (P.F.R) in series with a total volume ‘V’ gives the same conversion as one P.F.R. of volume________________?
A. V/n
B. V
C. V.n
D. 1/V - Photo-chemical reactions occur in presence of ___________________?
A. Sunlight
B. Darkness
C. Solid catalysts
D. Monochromatic radiation only - Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor ?
A. Temperature should be high in the beginning and decreased towards the end of the reaction
B. Very low temperature should be used throughout the reaction
C. Very high temperature should be used throughout the reaction
D. None of these - Chemical kinetics can predict the _______________ of a chemical reaction?
A. Rate
B. Feasibility
C. Both A. & B.
D. Neither A. nor B. - Pick out the wrong statement pertaining to space velocity of flow reactors?
A. The unit of space velocity is (time)-1
B. The space velocity of 3 hr-1 means that three reactor volumes of feed at specified conditions
are being fed into the reactor every hour
C. The space velocity of 3 hr-1 means that one third reactor volume of feed at specified
conditions are being fed into the reactor
D. None of these - Fractional conversion _____________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇌ 2NH3?
A. Increases
B. Decreases
C. Remains unchanged
D. Unpredictable from the data - The following half life data are available for the irreversible liquid phase reaction A → products. The overall order of reaction is __________________?
A. 0.5
B. 1
C. 1.5
D. 2 - What is the dispersion number for a plug flow reactor ?
A. 0
B. ∞
C. 1
D. -1
