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NEET 2012
Exam
NEET
Year
2012
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2012 · Chemistry · d and f Block Elements

The catalytic activity of transition metals and their compounds is...

The catalytic activity of transition metals and their compounds is ascribed mainly to

Options

  1. Atheir magnetic behaviour
  2. Btheir unfilled dd-orbitals
  3. Ctheir ability to adopt variable oxidation states
  4. Dtheir chemical reactivity

Correct answer

C. their ability to adopt variable oxidation states

Step-by-step solution

Transition metals show variable oxidation states, due to which they can perform as catalyst.  e.g., 2SO2+O2⟶V2O5 (catalyst) 2SO3SO2+ V2+5O5⟶SO3+ V2+4O4 V2+4O4+O2⟶ V+5 V5\begin{aligned} & \text{ e.g., } 2 \mathrm{SO}_2+\mathrm{O}_2 \underset{\text{ (catalyst) }}{\stackrel{\mathrm{V}_2 \mathrm{O}_5}{\longrightarrow}} 2 \mathrm{SO}_3 \\ & \mathrm{SO}_2+\stackrel{+5}{\mathrm{~V}_2} \mathrm{O}_5 \longrightarrow \mathrm{SO}_3+\stackrel{+4}{\mathrm{~V}_2} \mathrm{O}_4 \\ & \stackrel{+4}{\mathrm{~V}_2} \mathrm{O}_4+\mathrm{O}_2 \longrightarrow \stackrel{+5}{\mathrm{~V}}\mathrm{~V}_5 \\ & \end{aligned}
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