Pick out the correct statement?

A. A lower temperature favours the reaction of lower activation energy
B. The dispersion number for a reactor/vessel is uL/D
C. The rate controlling step in a reaction involving many steps is the fastest step
D. Pore volume and porosity of a catalyst is measured by Brunauer-Emmett-Teller (BET)
technique

Related Mcqs:

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...
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A. A catalyst speeds up the forward reaction but slows shown the reverse reaction B. Addition of catalyst changes the equilibrium constant C. Pressure changes do not change the equilibrium concentrations D. The composition of equilibrium is changed by catalyst...
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A. A catalyst does not change AH of the reaction B. A catalyst changes the equilibrium point C. Law of mass action was suggested by Le-Chatelier D. The difference between the energy of reactants and that of the products is the activation energy...
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A. In catalytic reactions, the catalyst reacts with the reactants B. A catalyst initiates a chemical reaction C. A catalyst lowers the activation energy of the reacting molecules D. A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction...
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A. Reactions with high activation energies are very temperature sensitive B. Chemical equilibrium is a static state C. A photochemical reaction is catalysed by light D. A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction...
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ?
A. t ∝ 1/an B. t ∝ 1/an – 1 C. t ∝ 1/an + 1 D. t ∝ an...
Pick out the wrong statement ?
A. For a first order consecutive reaction, a tubular flow reactor as compared to a stirred tank reactor provides higher overall selectivity B. For an ideal mixed reactor at steady state, the exit stream has the same composition as fluid within the reactor and the space time is equivalent to holding time for constant density...
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A. Autocatalytic reactions are exemplified by microbial fermentation reactions B. The slowest step has the greatest influence on the overall reaction rate in case of an irreversible series reaction C. The fractional conversion at any time is same for both the constant as well as the variable volume system in case of an irreversible unimolecular...
Pick out the wrong statement?
A. In a first order reaction, A → products; the reaction becomes slower as it proceeds, because the concentration of A decreases and the rate is proportional to the concentration of A B. Transition state theory approaches the problem of calculating reaction rates by concentrating on the idea of activated complexes C. According to the...
Pick out the wrong statement ?
A. In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time B. In a semi-batch reactor, one reactant is charged batch wise, while the other reactant is fed continuously C. In a continuous flow reactor, uniform concentration cannot be maintained throughout the vessel even in...