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.Management Sciences
Category: Chemical Reaction
Pick out the wrong statement?
A. Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value &
chemical agents, is maximum at a temperature of about 45°C
B. Most of the enzyme catalysed reactions involve at least two substrates
C. Enzymes help in increasing the activation energy of the reaction
D. Equilibrium concentrations in enzyme catalysed reactions can be calculated by using the
thermodynamic properties of substrates & products
A rise in temperature ______________________?
A. Normally tends to increase the reaction rate
B. Does not affect a catalysed reaction
C. Does not affect photo-chemical reaction rates
D. All A., B. and C.
The rate equation for the reaction represented by as shown in the bellow figure, is given by – rx = K1 . Cx/(1 + K2 Cx). At high value of Cx (i.e.., K2Cx > > 1), the order of the reaction and the rate constant are respectively___________________?
A. Zero order & K1/K2
B. Zero order & K1
C. First order & K1
D. First order & K1/K2
______________ is the response curve for a step input signal from a reactor ?
A. S-curve
B. C-curve
C. I-curve
D. None of these
The preferred reacting system for oxidation of o-xylene to phthalic anhydride is _____________________?
A. Jacketed liquid phase CSTR
B. Jacketed steam heated multitubular reactor
C. Multitubular reactor with cooling
D. Multistage multitubular reactor with interstage cooling
In which of the following gaseous phase reversible reactions, the product yield cannot be increased by the application of high pressure ?
A. N2 + O2 ⇌ 2NO
B. PCl3 + Cl2 ⇌ PCl5
C. N + 3H2 ⇌ 2NH3
D. 2SO2 + O2 ⇌ 2SO3
In the reversible reaction of the type, A + B ⇌ AB, in general__________________?
A. Both forward and backward reactions will be exothermic
B. Neither of the reactions will be endothermic
C. The combination reaction will be exothermic, while the dissociation reaction will be
endothermic
D. The combination reaction will be endothermic, while the dissociation reaction will be
exothermic
Catalyst is a substance, which ________________ chemical reaction?
A. Increases the speed of a
B. Decreases the speed of a
C. Can either increase or decrease the speed of a
D. Alters the value of equilibrium constant in a reversible
The enzyme which can catalyse the conversion of glucose to ethyl alcohol is ___________________?
A. Invertase
B. Maltase
C. Diastase
D. Zymase
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