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Which one of the following characteristics of the transition metals is associated with their catalytic activity?

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Which one of the following characteristics of the transition metals is associated with their catalytic activity?

(a) High enthalpy of atomization 

(b) Paramagnetic behaviour

(c) Colour of hydrated ions

(d) Variable oxidation states

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Correct option (d) Variable oxidation states

Explanation :

The transition elements, on account of their variable valency, are able to form unstable intermediate compounds very readily.

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