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.Management Sciences
Category: Chemical Reaction
Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________?
A. CaO is not dissociated
B. CO2 escapes continuously
C. Of high calcination temperature
D. CaO is more stable than CaCO3
The importance of diffusion in a catalyst are increased by ____________________?
A. Large catalyst particle size
B. An active surface of the catalyst
C. Small pore diameter
D. All A., B. and C.
Exposure of a photographic plate to produce a latent image is an example of _______________ reaction?
A. Very slow
B. Very fast
C. Photochemical
D. Both B. and C.
The rate constant of a first order reaction depends on the ________________?
A. Concentration of the reactant
B. Temperature
C. Concentration of the product
D. Time
Which of the following is not endothermic in nature ?
A. Combustion of sulphur
B. Gasification of carbon
C. Thermal cracking of fuel oil
D. Steam reforming of naphtha
When an exothermic reversible reaction is conducted adiabatically, the rate of reaction____________________?
A. Continuously increases
B. Continuously decreases
C. Passes through a maximum
D. Passes through a minimum
In a semi-batch reactor _____________________?
A. Velocity of reaction can be controlled
B. Maximum conversion can be controlled
C. Both the reactants flow counter-currently
D. Residence time is constant
What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on ?
A. Litre/mole.second
B. Moles/litre.second
C. Litre/mole
D. Litre/second
Rate of a chemical reaction is not affected by the____________________?
A. Catalyst
B. Temperature
C. Reactant’s concentration
D. Number of molecules of reactants taking part in the reaction
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