Consider the following statements regarding the catalytic applications of d -block elements and their compounds: (a) V₂O₅ catalyses the oxidation of SO₂ in the manufacture of sulphuric acid. (b) TiCl₄ with Al(CH₃)₃ is used to manufacture polyethylene. (c) Iron catalysts are used in the Haber process for the production of ammonia. (d) Polymerisation of alkynes is catalysed by palladium complexes. How many of the above

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Statement (a) is correct. V₂O₅ is used in the Contact process for the oxidation of SO₂ to SO₃ . Statement (b) is correct. A mixture of TiCl₄ and Al(CH₃)₃ (Ziegler-Natta catalyst) is used for the polymerisation of ethylene to polyethylene. Statement (c) is correct. Finely divided iron is used as a catalyst in the Haber process to manufacture ammonia. Statement (d) is incorrect. The polymerisation of alkynes is catalysed by nickel complexes, not palladium complexes. Palladium(II) chloride ( PdCl₂ ) is instead used in