O-LevelChemistryBonding & Structure5070/12 · Oct/Nov 2023 · Q21 Mark

A crystal of sodium chloride is dropped into a beaker of water and the crystal dissolves. There are four stages in this process. 1 The water molecules collide with the ions in the crystal lattice. 2 The ionic bonds in the crystal break. 3 The ions move randomly in all directions until they are evenly spread throughout the solution. 4 The ions continue to move randomly in all directions but remain evenly spread throughout the solution. At which stages is diffusion occurring?

A1, 2 and 4

B2 and 3

C3 only

D4 only

✓ Correct answer

C: 3 only

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 2.

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