O-LevelChemistryBonding & Structure5070/11 · May/June 2013 · Q81 Mark

Both magnesium oxide, MgO, and aluminium oxide, Al2O3, are solids at room temperature, 25 °C. MgO has a melting point of 2852 °C and a boiling point of 3600 °C. Al2O3 has a melting point of 2072 °C and a boiling point of 2880 °C. Over which temperature range will both pure compounds conduct electricity?

A25 to 2852 °C

B2072 to 2852°C

C2852 to 2880 °C

D2880 to 3600 °C

✓ Correct answer

C: 2852 to 2880 °C

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2013 Paper 1 Variant 1, question 8.

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