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NEETChemistryd and f Block Elements

Consider the following industrial processes: (i) Oxidation of SO ₂ in the manufacture of sulphuric acid (ii) Polymerisation of ethylene (iii) Oxidation of ethyne to ethanal Identify the correct sequence of the oxidation states of the transition metals present in the primary catalytic compounds used for the above processes respectively.

Options

  1. A+4, +4, +2
  2. B+5, +3, +2
  3. C+5, +4, +2
  4. D+5, +4, +4

Correct answer

C. +5, +4, +2

Step-by-step solution

(i) The catalyst used for the oxidation of SO ₂ in the manufacture of sulphuric acid (Contact process) is V ₂ O ₅ . The oxidation state of vanadium (V) in V ₂ O ₅ is +5 . (ii) The catalyst used for the polymerisation of ethylene is the Ziegler-Natta catalyst, which is a mixture of TiCl ₄ and Al(CH₃)₃ . The transition metal is titanium (Ti), and its oxidation state in TiCl ₄ is +4 . (iii) The catalyst used for the oxidation of ethyne to ethanal is PdCl ₂ . The oxidation state of palladium (Pd) in PdCl ₂ is +2 . Thus

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