Plants manufacture carbohydrates from the carbon dioxide of the atmosphere by
A.oxidation
B.polymerization
C.condensation with water
D.a photochemical reaction
Category: Chemical Reaction Engineering Mcqs
In a reaction, the threshold energy is equal to
A.activation energy
B.activation energy + normal energy of reactants
C.normal energy of reactants
D.activation energy – normal energy of reactants.
The excess energy of the reactants required to dissociates into products is known as
A.activation energy
B.binding energy
C.threshold energy
D.thermal energy
For the chemical reaction 3A + B ? C, the rate of formation of C is 0.30 mole/(1 hr). The rate of disappearance of A is
A.0.30 mole / (1 hr)
B.0.90 mole / (I hr)
C.0.10 mole / (I hr)
D.?0.30 mole / (I hr)
The catalytic activity of enzymes is due to their capacity to
A.Lower the potential energy
B.lower the kinetic energy
C.increase the activation energy
D.lower the activation energy.
An exothermic reaction is that in which the reacting substances
A.have more energy than the products
B.have less energy than the products
C.have as much energy as the products
D.are at a higher temperature than the products
During the course of a chemical reaction, the rate of a reaction
A.increases as the reaction proceeds
B.decreases as the reaction proceeds
C.cannot be predicted
D.remains constant throughout the reaction.
Which of the following statements in incorrect?
A.A rise in temperature usually tends to reduce the reaction rate
B.A rise in temperature usually increases reaction rates
C.A rise in temperature does not affect photo-chemical reaction rates
D.A rise in temperature has no effect on catalysed reaction.
In the question 109 the holding time is
A.sec
B.sec
C.1 sec
D.2 sec.
