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(i) The flow chart below shows steps in ...

(i) The flow chart below shows steps in the Contact process or the manufacture of sulphuric acid :

(ii) Write equations for :
(1) The roasting of iron pyrites.
(2) Formation of sulphur trioxide from sulphur dioxide.(III)
(3) Platinum was the catalyst used in the conversion of sulphur dioxide to sulphur trioxide. What is the common name of the catalyst used nowadays ?
(4) Give the formula of oleum.
(5) Name the substance which is added to change oleum into sulphuric acid.

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