A. Operational yield
B. Relative yield
C. Selectivity
D. None of these
Correct Answer: Selectivity ✔
Last Updated: February 23, 2019
Related MCQs
- Space time equals the mean residence time__________?
- Chemical reaction rate of a component depends upon the__________?
- If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatelier’s principle)?
- For a first order reaction carried out in a plug flow reactor, the space time is__________?
- With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of ‘R’ in mixed reactor (for a given conversion of ‘A’) ?
- A space time of 3 hours for a flow reactor means that__________?
- For a reaction of the type of bellow given figure, the rate of reaction (- rx) is given by__________?
- A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1; (ΔH) = – 40kJ/mole; ρ = 1000kg/m3 CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is__________?
- 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 reactor is generally termed as an autoclave, when it is a__________?
- For an autocatalytic reactor, the suitable reactor set up is__________?
- Which of the following factors control the design of a fluid-solid reactor ?
- __________ explains the mechanism of catalysis?
- If Thiele modulus is __________, then the pore diffusion resistance in a catalyst may be considered as negligible?
- Rate of a chemical reaction is not influenced by the__________?
- The irreversible reaction is a special case of reversible reaction, if the__________?
- For multiple reactions, the flow pattern within the vessel affects the __________?
- A catalyst is said to be a negative catalyst, if it __________?
- The following half life data are available for the irreversible liquid phase reaction A → products. The overall order of reaction is __________?
- The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy?
- The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a ‘tanks in series model’ comprising of ‘m’ tanks is equal to __________?
- If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is __________?
- Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for bimolecular) as__________?
- A back mix reactor is__________?
- The increase in the rate of reaction with temperature is due to__________?
- In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2, the yield of B increases with the__________?
- Helium-mercury method can be used to determine the __________ of the catalyst particle?
- Which of the following is the most suitable for very high pressure gas phase reaction ?
- Half life period of a chemical reaction is__________?
- Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is__________?
- In a continuous flow stirred tank reactor, the composition of the exit stream__________?
- Kinetics of a catalytic reaction can be best studied on a/an __________ reactor?
- Equilibrium of a chemical reaction as viewed by kinetics is a __________ state?
- A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 k.mole/m3, the volume of the mixed flow reactor should be increased by a factor of__________?
- In Langmuir treatment of adsorption,__________?
- A non-catalytic chemical reaction of the type as shown in the bellow figure is called a __________ reaction?
- A first order homogeneous reaction of the type X → Y → Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time ?
- Which of the following will give maximum gas conversion ?
- Threshold energy in a reaction is equal to the__________?
- For the irreversible elementary reactions in parallel as shown in the bellow figure, the rate of disappearance of ‘X’ is equal to__________?
- Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇌ 2NH3?
- A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors?
- Which of the following is used for calcination of limestone and dolomite in industrial practice?
- A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant) ?
- According to the ‘law of mass action’, the rate of reaction is directly proportional to the__________?
- In a chemical reaction as shown in the bellow figure, it is observed that the (i) Rate of formation of ‘P’ is doubled on doubling the concentration of ‘X’ (ii) Rate of formation of ‘P’ is quadrupled on doubling the concentration of ‘Y’ (iii) Doubling the concentration of ‘Z’ does not affect the rate of formation of ‘P’ What is the order of the above chemical reaction ?
- With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases?
- A liquid phase reaction is to be carried out under isothermal conditions. The reaction rate as a function of conversion has been determined experimentally and is shown in the figure given below. What choice of reactor or combination of reactors will require the minimum overall reactor volume, if a conversion of 0.9 is desired ?
- What is the order of chemical reaction as shown in the bellow figure, if it is found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quadrupled when the concentrations of both B & C were doubled ?
- For the reaction, A + B → 2B + C,__________?
- The reaction rate constants at two different temperatures T1 and T2 are related by __________?