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.Management Sciences
Category: Chemical Reaction
For a zero order reaction, the concentration of product increases with the _____________________?
A. Increase of reaction time
B. Increase in initial concentration
C. Total pressure
D. Decrease in total pressure
From Arrhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is___________________?
A. k cal
B. k cal/°K
C. °K
D. k cal. °K
For a zero order chemical reaction, the__________________?
A. Half life period is directly proportion to the initial concentration of the reactants
B. Plot of products concentration with time is a straight line through the origin
C. Products concentration increases linearly with time
D. All A., B. and C.
Limiting reactant in a chemical reaction decides the____________________?
A. Rate constant
B. Conversion
C. Reaction speed
D. Equilibrium constant
The rate of a homogeneous reaction is a function of__________________?
A. Temperature and pressure only
B. Temperature and composition only
C. Pressure and composition only
D. All temperature, pressure and composition
Photochemical reaction rate does not depend significantly on temperature, because____________________?
A. It is a reversible reaction
B. It is an exothermic reaction
C. The energy of reacting molecules exceeds the activation energy by absorption of light
D. None of these
A catalyst loses its activity due to__________________?
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.
The rate constant of a chemical reaction increases by increasing the______________________?
A. Temperature
B. Pressure
C. Reactant’s concentration
D. None of these
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________________?
A. keff = k + kg
B. keff = (k+ kg)/2
C. keff = (kkg)1/2
D. 1/keff = 1/k + 1/kg
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