d and f BLOCK ELEMENTS

Why is finely divided iron used as a catalyst in Haber's Process?

• It is cheaper than other metals
• It is magnetic
• It provides a large surface area for reactant adsorption
• It is liquid at reaction conditions

What is the primary function of a catalyst in a chemical reaction?

• To change the equilibrium position
• To increase the energy of the products
• To lower the activation energy and increase the reaction rate
• To be consumed in the reaction

Which catalyst is used in the Contact Process mentioned in the text?

• Finely divided iron
• Nickel
• Vanadium(V) oxide
• Platinum

What is the main characteristic that distinguishes a complex compound formed by a transition metal?

• High ionic charge only
• Small ionic size only
• The involvement of d-orbitals in bond formation
• Ionic bonding only

How does the formation of bonds between reactants and the catalyst surface affect the reaction?

• It decreases reactant concentration and increases activation energy
• It has no effect on concentration or energy
• It increases reactant concentration at the surface and lowers activation energy
• It makes the reaction irreversible