February/March 2026 Paper 42

2026 · 6 questions · 51 parts · 80 marks

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Context for question 3

The salt sodium chloride, NaCl, can be prepared in the laboratory by different methods.

method 1 Burning sodium metal is placed into a gas jar of chlorine gas. Solid sodium chloride is formed.

2Na + Cl

_{2}

\to

2NaCl

method 2 Dilute hydrochloric acid is added to a known volume of aqueous sodium hydroxide in the presence of an indicator until a neutral solution is formed.

3(a)(i)Tests Ions GasesEasy1 mark

State the colour of the flame sodium metal burns with before it is placed into the chlorine gas in method 1.

3(a)(ii)Group 7 HalogensEasy1 mark

State the colour of the chlorine gas before the burning sodium metal is added to it in method 1.

3(a)(iii)Gas Volume CalculationsMedium3 marks

Calculate the mass of sodium chloride formed when excess burning sodium metal is placed into 960 cm

^{3}

of chlorine gas at room temperature and pressure in method 1.

Mass of sodium chloride (g)

0 words

3(b)(i)Acid Base Properties ReactionsEasy1 mark

Write the ionic equation which represents the neutralisation reaction that takes place in method 2.

Answer

3(b)(ii)Acid Base Properties ReactionsEasy1 mark

Name a suitable indicator to use in method 2.

3(b)(iii)Preparing SaltsEasy1 mark

Name the experimental technique used in method 2.

3(c)Ionic Bonding Ionic StructuresMedium3 marks

In Figure 3.1, complete the dot-and-cross diagram of the ions in sodium chloride.

Give the charges on the ions.

Draw with the mouse or a finger.

3(d)

Molten and aqueous sodium chloride are separately electrolysed using inert electrodes.

3(d)(i)ElectrolysisEasy2 marks

Name a suitable inert non-metal electrode and a suitable inert metal electrode.

Non-metal electrode

Metal electrode

3(d)(ii)ElectrolysisMedium3 marks

Complete Table 3.1 to show the name of the product formed at the cathode during the electrolysis of different forms of sodium chloride.

molten

dilute aqueous solution

concentrated aqueous solution