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A. Loss in surface area of the active component
B. Agglomeration of metal particles caused by thermal sintering of the solid surface
C. Covering of the catalytic active sites by a foreign substance
D. All A., B. and C.
Related Mcqs:
- 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...
- With increase in temperature, the rate constant obeying Arrhenius equation____________________?
- A. Increases B. Decreases C. Decreases exponentially D. Can either increase or decrease; depends on the frequency factor...
- The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the_________________?
- A. Increased temperature reduces the activation energy B. Fraction of molecules having threshold energy increases C. Collision frequency increases D. Value of threshold energy decreases...
- The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________________?
- A. Plot of – rA Vs CA is a straight line with slope k B. Plot of – rA Vs CA is a hyperbola C. Rate of disappearance of reactant A is maximum, where CA = CB D. Both B & C...
- Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?
- A. Langmuir adsorption isotherm B. Adsorption isobar C. Freundlich adsorption isotherm D. None of these...
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