A. Activation
B. Potential
C. Binding
D. Threshold
Correct Answer: Activation ✔
Last Updated: February 23, 2019
Related MCQs
- 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 __________?
- The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor?
- For the liquid phase parallel reactions__________?
- Organic catalysts differ from the inorganic catalyst in the sense that the former is__________?
- For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is__________?
- The rate at which a chemical substance reacts is proportional to its__________?
- For any reaction, we may write conversion as a function of__________?
- When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ column?
- Helium-mercury method is used for the measurement of the __________ of the catalyst?
- With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will__________?
- If the rate of a chemical reaction becomes slower at a given temperature, then the__________?
- For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction?
- Which of the following is a characteristic of an ideal plug flow reactor ?
- What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction ?
- Collision theory gives the rate constant for bimolecular reaction as__________?
- For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant ?
- The order of the chemical reaction as shown in the bellow figure, whose rate equation is given as -rA = KCA__________?
- Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature?
- A space velocity of 5 hr-1 means that __________?
- The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?
- For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance?