Day 1

Question 1

Explain the trend in thermal stability of the Group II carbonates down the group.

Question 2

Explain why ammonium nitrate (NH₄NO₃) is thermally unstable, referring to the redox nature of its decomposition.

Day 2

Question 1

Describe the structure and bonding in lithium tetrahydroaluminate, LiAlH₄.

Question 2

Describe two industrial methods for the manufacture of hydrogen.

Question 1

Describe the preparation of hydrogen peroxide from barium peroxide.

Question 2

What is a diagonal relationship? Give an example involving lithium and another element, citing two properties that illustrate this relationship.

Question 1

Describe the amphoteric nature of aluminium hydroxide and write equations to show its reaction with both acids and bases.

Question 2

Question 1

What is the mean oxidation state of sulfur in the thiosulfate ion (S₂O₃²⁻)? Why are the two sulfur atoms in different environments?

Question 2

Describe the reaction of potassium superoxide (KO₂) with water and explain its use in rebreathers.

Question 1

Concentrated nitric(V) acid can act as an oxidizing agent. Describe its reaction with copper metal.

Question 2

Classify the following oxides as acidic, basic, amphoteric, or neutral: Na₂O, SO₂, Al₂O₃, CO.