Catalytic poisons make the catalyst ineffective because ...

  • A
    they are adsorbed on the catalyst surface first.
  • B
    they adsorb the reactant molecules.
  • C
    they combine chemically with the catalyst.
  • D
    they combine with one of the reactants.

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Match the catalyst with the process:
Catalyst Process
$i. Na_{2}O$ $a. \text{Oxidation of } SO_{2} \text{ in the manufacture of } H_{2}SO_{4}$
$ii. TiCl_{4} + Al(CH_{3})_{3}$ $b. \text{Polymerisation of ethylene}$
$iii. PdCl_{2}$ $c. \text{The oxidation of ethyne to ethanal}$
$iv. \text{Nickel complexes}$ $d. \text{Polymerisation of alkynes}$

Which of the following is the correct option?

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