May/June 2026 Paper 41

2026 · 7 questions · 47 parts · 80 marks

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6(a)(i)Acid Base Properties ReactionsEasy1 mark

This question is about metallic compounds. Zinc oxide, ZnO, reacts with both acids and alkalis to produce salts. State the term given to oxides that react with both acids and alkalis.

6(a)(ii)Formulae Chemical EquationsEasy1 mark

When zinc oxide reacts with aqueous sodium hydroxide it forms sodium zincate. Sodium zincate contains sodium ions, Na

^{+}

, and zincate ions, ZnO

_{2}^{2 -}

. Write the formula of sodium zincate.

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

The reaction between zinc oxide and dilute sulfuric acid forms aqueous zinc sulfate as one of the products. Write the symbol equation for the reaction between zinc oxide and dilute sulfuric acid.

Answer

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6(a)(iv)Formulae Chemical EquationsEasy2 marks

When aqueous barium chloride is added to aqueous zinc sulfate, a precipitate of barium sulfate, BaSO

_{4}

, is produced. Write an ionic equation for this precipitation reaction. Include state symbols.

Answer

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6(a)(v)Tests Ions GasesEasy1 mark

Give the colour of the precipitate that forms in 6(a)(iv).

6(b)(i)Mass CalculationsMedium3 marks

Chromium(III) oxide is a product of the thermal decomposition of potassium dichromate(VI), K

_{2}

_{2}

_{7}

. The other products are potassium chromate(VI), K

_{2}

CrO

_{4}

, and oxygen, O

_{2}

. The equation for the thermal decomposition is shown.

4 K_{2} C r_{2} O_{7} \to 4 K_{2} Cr O_{4} + 2 C r_{2} O_{3} + 3 O_{2}

Calculate the maximum mass of Cr

_{2}

_{3}

that is produced by the thermal decomposition of 11.76 g of K

_{2}

_{2}

_{7}

. [

M_{r}

: K

_{2}

_{2}

_{7}

, 294; Cr

_{2}

_{3}

, 152] Use the following steps. • Calculate the number of moles of K

_{2}

_{2}

_{7}

used. • Calculate the number of moles of Cr

_{2}

_{3}

formed. • Calculate the mass of Cr

_{2}

_{3}

formed.

Answer

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6(b)(ii)Oxidation Reduction Redox EquationsEasy2 marks

Give the meaning of (VI) in potassium chromate(VI).

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

Potassium dichromate(VI) is an orange solid. Identify the element which causes potassium dichromate(VI) to be coloured.

6(c)Dynamic Equilibria Equilibrium ConstantsMedium3 marks

Dinitrogen tetroxide, N

_{2}

_{4}

, decomposes into nitrogen dioxide, NO

_{2}

. The reaction is reversible.

N_{2} O_{4} (g) ⇌ 2 N O_{2} (g)

The forward reaction is endothermic. A mixture of N

_{2}

_{4}

and NO

_{2}

gases are allowed to reach equilibrium in a closed container.

pressure increases: effect on the equilibrium concentration of NO

_{2}

(g)

temperature decreases: effect on the equilibrium concentration of NO

_{2}

(g)

addition of a suitable catalyst: effect on the equilibrium concentration of NO

_{2}

(g)