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Platinised asbestos is used as a catalyst in, the manufacture of \( \boldsymbol{H}_{2} \boldsymbol{S} \boldsymbol{O}_{4} \) It is an example of:

1. homogeneous catalyst
2. heterogeneous catalyst
3. autocatalyst
4. induced catalyst

Correct answer: heterogeneous catalyst

Solution

Platinised asbestos is a solid catalyst, while the reacting substances in the contact process are gases. Since the catalyst and reactants are in different phases, it is a heterogeneous catalyst.

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