Answer:
(i) The second reaction is expected
to be faster because iodine molecules in the gaseous state have greater surface
area and more kinetic energy than the molecules in the solid state.
(ii) The reaction carried in the
presence of catalyst is faster because in the catalysed reaction the activation
energy needed is less as compared to the uncatalysed reaction.
(iii) The second reaction is
faster because the increase in temperature increases the number of effective
collisions among the reacting species.
(iv) The first reaction will proceed at
a faster speed because under high pressure the number of reactant molecules per
unit volume are more compared with low pressure. This means that when the
pressure is high, the collisions among the reactant molecules are more and as a
result, the chemical reaction will be fast compared with low pressure.
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