9.2 Electrochemical Cells

Which of the following elements is known for its importance in catalysis and is often used in the automotive industry to reduce harmful emissions?

A. Neon

B. Platinum

C. Argon

D. Zinc

The f-block elements are also known as:

A. Alkali metals

B. Halogens

C. Lanthanides and Actinides

D. Noble gases

Which of the following trends is observed for elements in the same group of the periodic table?

A. Decreasing atomic size as one moves down the group

B. Increasing ionisation energy as one moves down the group

C. Increasing atomic size as one moves down the group

D. Constant electronegativity as one moves down the group

Transition metals are known to form coloured compounds. This is primarily due to:

A. Their ability to form covalent bonds

B. The presence of d-d electron transitions

C. Their high electronegativity

D. The presence of f-f electron transitions

Which block of the periodic table is characterised by the filling of the d orbitals?

A. s-block

B. p-block

C. d-block

D. f-block

a) Describe the basic setup of a galvanic cell and its function. [3]

b) How does the direction of electron flow in a galvanic cell relate to the oxidation and reduction half-reactions? [2]

a) What is the significance of cell potential in a galvanic cell? [2]

b) If a cell has a positive cell potential, what does it indicate about the spontaneity of the reaction? [2]

a) Define electrolysis and its significance in electrochemical cells. [3]

b) How is the principle of electrolysis applied in electroplating? [2]

a) Explain the difference between a galvanic cell and an electrolytic cell in terms of energy conversion. [2]

b) In a galvanic cell, what is the role of the salt bridge or porous disk? [2]

c) Why is it important to balance redox reactions in acidic or basic solutions? [3]

a) Describe the process of determining the cell potential for a galvanic cell. [3]

b) How does a positive cell potential relate to the Gibbs free energy change of the reaction? [2]

c) Why are transition metals often used as catalysts in redox reactions? [3]