A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either A., B. or C.
Correct Answer: Chemical reaction ✔
Last Updated: February 20, 2019
Related MCQs
- For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times?
- Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?
- The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reactions with low activation energy are __________?
- A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes?
- Fluidised bed reactor is characterized by__________?
- Velocity of a chemical reaction__________?
- Shift conversion reaction__________?
- The conversion for a second order, irreversible reaction (constant volume) as shown in the bellow figure, in batch mode is given by__________?
- Find a mechanism that is consistent with the rate equation and reaction given below ?
- In a semi-batch reactor __________?
- The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between__________?
- For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to __________?
- The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of „E/R’ is __________?
- Most important characteristics of gas-liquid reactors are the__________?
- The reaction between oxygen and organic material is a/an __________ reaction?
- Which of the following is not a theory of homogeneous reaction ?
- 6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ?
- A first order reaction requires two equal sized CSTR. The conversion is__________?
- The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the__________?
- What is the order of a chemical reaction of the bellow figure, if the rate of formation of ‘C’, increases by a factor of 2.82 on doubling the concentration of ‘A’ and increases by a factor of 9 on trebling the concentration of ‘B’ ?
- Higher free energy of activation of a chemical reaction (at a given temperature) implies __________?
- As the chemical reaction proceeds, the rate of reaction __________?
- Integral method for analysing the kinetic data is used __________?
- A pulse tracer is introduced in an ideal CSTR (with a mean residence time I) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be__________?
- Inversion of cane sugar is an example of __________?
- A typical example of an exothermic reversible reaction conducted at high pressure in industry is__________?
- Reaction rate of a first order reaction, which is half completed in 23 minutes will be __________?
- The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction?
- Chemical kinetics can predict the __________ of a chemical reaction?
- A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to __________?
- The reactions with low activation energy are __________?
- Rate of an autocatalytic chemical reaction is a function of __________?
- Oil is hydrogenated using nickel catalyst in a __________ reactor?
- The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction?
- Which of the following is not endothermic in nature ?
- Differential method for analysing the kinetic data is used __________?
- For a tubular flow reactor with uniform concentration and temperature, the independent variable is__________?
- In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO2 to SO3 is accomplished by a __________ reaction ?
- The catalyst in a first order chemical reaction changes the__________?
- For a tubular reactor with space time ‘η’ and residence time ‘ζ’, the following statement holds good ?
- Kinetics of a solid catalysed reaction can best be studied in a __________ reactor?
- If ‘n’ is the order of reaction, then unit of rate constant is __________?
- A rise in temperature __________?
- BET apparatus is used to determine the __________?
- Effectiveness factor of a catalyst pellet is a measure of the __________ resistance?
- In the fluid catalytic cracker (FCC), the cracking reaction is (i) and the regeneration is (ii) __________?
- A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is __________?
- In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased ?
- A plug-flow reactor is characterized by __________?
- The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be __________ times?
- In a CSTR __________ varies with time ?