d and f BLOCK ELEMENTS

Why are transition metal ions effective catalysts in reactions involving changes in oxidation states?

• Because they are always in the +3 oxidation state
• Because they cannot change their oxidation states
• Because they are highly ionic
• Because they can change their own oxidation states easily

How does a catalyst at a solid surface generally increase the rate of reaction?

• By increasing the temperature
• By increasing reactant concentration at the surface and lowering activation energy
• By changing the stoichiometry of reactants
• By decreasing reactant concentration at the surface

What catalyst is used in Catalytic Hydrogenation reactions?

• Iron
• Vanadium(V) oxide
• Nickel

Which metal is used as a catalyst in Haber's Process for ammonia synthesis?

• Vanadium
• Nickel
• Finely divided iron

Which oxide is used as a catalyst in the Contact Process?

• Iron(III) oxide
• Vanadium(V) oxide
• Nickel oxide
• Manganese(IV) oxide