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.Management Sciences
Category: Chemical Reaction
Pick out the correct statement ?
A. A chemical reaction accompanied by absorption of heat is called an exothermic reaction
B. A chemical reaction accompanied by evolution of heat is called an endothermic reaction
C. The rate constant for a first order reaction does not change on changing the concentration units
D. Chemical equilibrium state is dynamic in nature
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k1/k2). CA a-b ?
A. Use high pressure and eliminate inerts, when a > b
B. Avoid recycle, when a > b
C. Use batch reactor or plug flow reactor, when a > b
D. Use CSTR with a high conversion, when a > b
Pick out the wrong statement ?
A. In a multistep reaction, the slowest step is the rate determining step
B. In general, the rate of a reaction becomes triple for every 10°C rise in temperature
C. Slow chemical reactions have generally high values of activation energy
D. Molecularity of a reaction cannot be zero but the order of a reaction can be zero
A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?
A. Inner catalyst core of radius R/8 does not participate in reaction
B. Inner catalyst core of radius R/2 does not participate in reaction
C. Inner catalyst core of radius 7R/8 does not participate in reaction
D. Effectiveness factor for a zero order reaction cannot be 7/8 as it must always be 1
The equilibrium constant ‘K’ of a chemical reaction depends on_________________?
A. Temperature only
B. Pressure only
C. Temperature and pressure
D. Ratio of reactants
Backmixing is most predominant in___________________?
A. A well stirred batch reactor
B. A plug-flow reactor
C. A single CSTR
D. CSTR’s connected in series
Bulk diffusion in catalyst pore _______________ with increase in pressure?
A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentially
A non-catalytic chemical reaction of the type as shown in the bellow figure is called a _____________ reaction?
A. Parallel
B. Series
C. Series-parallel
D. None of these
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the____________________?
A. Catalyst size is reduced or the catalyst diffusivity is reduced
B. Catalyst size is reduced or the catalyst diffusivity is increased
C. Catalyst size is increased or the catalyst diffusivity is reduced
D. Catalyst size is increased or the catalyst diffusivity is increased
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