Answer :

(a) Fe(III) acting as catalyst for the reaction between iodide and persulphate ions.

2Fe3+ + 2I- 2Fe2+ + I2

2Fe2+ + S2O82- 2Fe3+ + 2SO42-

(b) Three processes where transition metals act as catalysts.

(i) Finely divided Nickel as catalyst for hydrogenation of vegetable oil

(ii) V2O5 as catalyst for contact process used in the manufacture of sulphuric acid

(iii) Finely divided iron as catalyst for Haber’s process in the manufacture of ammonia

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