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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements2 Marks
Question
Explain giving reason:Transition metals and their many compounds act as good catalyst.
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Answer

Catalytic properties: Many of transition metals and their compounds act as catalyst in variety of reactions, e.g., finely divided iron in manufacture of $NH^3$ by Haber's process, $V^2O^5$ or Pt in manufacture of $H^2SO^4$ by Contact process, etc.). The catalytic activity is due to following two reasons.
  1. The ability of transition metal ion to pass easily from one oxidation state to another and thus providing a new path to reaction with lower activation energy.
  2. The surface of transition metal acts as very good adsorbent and thus provides increased concentration of reactants on their surface causing the reaction to occur.

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