ICSE 2000 : SCIENCE Paper 2 (Chemistry) - Question 3(c) Answer the following.

SCIENCE
Paper 2 (Chemistry) - 2000
(One hour and a half)

Question 3
(c) Some bacteria obtain their energy by oxidizing sulphur, producing sulphuric acid as a by-product. In the laboratory, or industrially, the first step in conversion of sulphur to sulphuric acid is to produce sulphur dioxide (see (b) (i) above). Then sulphur dioxide is converted to sulphur trioxide which reacts with water producing sulphuric acid.

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1.
(i) Name one catalyst used industrially which speeds-up the conversion of sulphur dioxide to sulphur trioxide.

2.
(ii) Write the equation for the conversion of sulphur dioxide to sulphur trioxide. Why does this reaction supply energy?

3.
(iii) What is the name of the compound formed between sulphur trioxide and sulphuric acid?

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