Surface Chemistry – 3

1) A lump of coal burns slowly in air while coat dust burns explosively because of the
a) Less mass of powdered coal
b) Large surface area of coal dust
c) Lower ignition temperature of coal dust
d) Nature of coal dust

2) Protons accelerate the hydrolysis of esters. This is an example of
a) A promoter
b) A hetrogeneous catalytic reaction
c) An acid base catalytic reaction
d) An auto catalytic reaction

3) The efficiency of a catalyst depends upon
a) Solubility
b) Molecular mass
c) Equivalent mass
d) Particle size

4) Any substance which completely destroys or reduces the activity of the catalyst is called a/an
a) Catalyst
b) Inhibitor
c) Promotor
d) Catalyst poison

5) Which of the following catalysts is used in the Fischer – Tropsch process for the synthesis of hydrocarbons from H2 and CO ?
a) 1
b) 2
c) 3
d) 4

6) The enzyme which can catalyse the conversion of glucose to ethanol is
a) Zymase
b) Invertase
c) Maltase
d) Diastase

7) Which is absorbed maximally by activated charcoal?
a) H2O vapours
b) CO2

c) CH4

d) SO2

8) The solution of TeCl4 and trialkylaluminium used as a  catalyst in the polymerisation of olefins is called
a) Wilkinson’s catalyst
b) Ziegler Natta catalyst
c) Homogenous catalyst
d) Grignard reagent


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