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Q.

Transition elements act as good catalysts because of

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a

Presence of partially filled d-orbitals

b

having high melting point

c

Easy inter convertibility of oxidation states due to low oxidation and reduction potential

d

Since they exhibit variable valency 

answer is A, C, D.

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Detailed Solution

Partially filled d-orbitals in the surface of solid metal from bonds with reactant molecules and decrease the activation energy. The vacant orbitals do not play any role in catalytic activity. Due to variable valency and easy inter convertibility from one oxidation to another they act as catalyst.

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Transition elements act as good catalysts because of