May/June 2026 Paper 43

2026 · 7 questions · 48 parts · 80 marks

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6(a)(i)Acid Base Properties ReactionsMedium1 mark

This question is about oxides. Aluminium oxide, Al

_{2}

_{3}

, is an amphoteric oxide. State the meaning of the term amphoteric.

6(a)(ii)Formulae Chemical EquationsEasy1 mark

Aluminium oxide is used to make calcium aluminate. Calcium aluminate contains calcium ions, Ca

^{2 +}

, and aluminate ions, AlO

_{2}^{-}

. Write the formula of calcium aluminate.

6(a)(iii)Acid Base Properties ReactionsEasy2 marks

When aluminium oxide reacts with dilute hydrochloric acid, aqueous aluminium chloride and one other product are formed. Write the symbol equation for the reaction between aluminium oxide and dilute hydrochloric acid.

Answer

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6(a)(iv)Formulae Chemical EquationsEasy2 marks

When aqueous silver nitrate is added to aqueous aluminium chloride, a precipitate of silver chloride, AgCl, is produced. Write an ionic equation for this precipitation reaction. Include state symbols.

Answer

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6(b)(i)Transition Metals Their ReactionsEasy1 mark

Ammonium dichromate, (NH

_{4}

)

_{2}

_{2}

_{7}

, decomposes when it is heated. The products are chromium(III) oxide, Cr

_{2}

_{3}

, nitrogen and water. Ammonium dichromate is an orange solid. Identify the element which causes ammonium dichromate to be coloured.

6(b)(ii)Formulae Chemical EquationsEasy2 marks

Write the symbol equation for the reaction that occurs when ammonium dichromate is heated.

Answer

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6(c)(i)Dynamic Equilibria Equilibrium ConstantsMedium1 mark

A mixture of sulfur dioxide, SO

_{2}

, oxygen, O

_{2}

, and sulfur trioxide, SO

_{3}

, is allowed to reach equilibrium in a closed system in the presence of a catalyst.

2 S O_{2} (g) + O_{2} (g) ⇌ 2 S O_{3} (g)

The forward reaction is exothermic. State what is meant by the term closed system.

6(c)(ii)Dynamic Equilibria Equilibrium ConstantsMedium3 marks

Complete Table 6.1.

decrease the pressure: effect on the equilibrium yield of SO

_{3}

(g)

increase the temperature: effect on the equilibrium yield of SO

_{3}

(g)

remove the catalyst: effect on the equilibrium yield of SO

_{3}

(g)

6(c)(iii)Nitrogen Sulfur Industrial ProcessesEasy1 mark

Name the industrial process in which sulfur dioxide is converted into sulfur trioxide.