WorksheetsCATALYSIS
Total questions: 10
Worksheet time: 5mins
How does a catalyst work in speeding up a reaction?
by lowering the activation energy or reaction
by giving them more energy
by making them more available
by increasing the activation energy or reaction
Catalysts may be in the state of ___________.
Solid and liquid only
Liquid and gases only
Solid and gases only
Solid, liquid or gases
Which of the following is incorrect for a catalyst?
Bio-chemical reactions are mostly catalysed by enzymes
Catalyst does not start a reaction
Catalyst changes the equilibrium constant of a reaction
Co-enzymes increase the activity of an enzyme
Which of the following is used as a catalyst in the haber process?
V2O5
Fe
Ag2O
SO3
According to adsorption theory of catalysis, the speed of the reaction increases because:
in the process of adsorption, the activation energy of the molecules becomes large.
adsorption produces heat which increases the speed of the reaction
the concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption.
adsorption lowers the activation energy of the reaction
Which one of the following is not an example for heterogenous catalysis?
Hydrogenation of oil
Manufacture of ammonia by Haber's process
Manufacture of sulphuric acid by Contact process
Hydrolysis of sucrose in presence of dilute hydrochloric acid
surface of the catalyst must be
smooth
evenly spread out
cracks and peaks
none of the above
catalytic poison in contact process
Pt
As2O3
Fe
H2S
The number of active centers are increased by
catalyst
catalytic poison
activators
inhibitors
In ester hydrolysis, initally, the rate of the reaction is very slow. But after some time the rate increases because of presence of
ester
water
acetic acid
HCl
