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

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

JIPMERJIPMER 2012The d-and f-Block Elements

Solution:

Transition metals are show variable oxidation states
$2SO_2 + O_2 \xrightarrow{V_2O_5} 2SO_3$
$SO_2 + V_{2}^{+5} O_5 \rightarrow SO_3 + V^{+4}_{2} O_{4} $
$V_{2}^{+4} O_4 + O_2 \rightarrow V^{+5}_{2} O_5$