Question

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Why does iron not rust when dipped in boiling water? [2 marks]

Answer 1

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Boiling water drives out all the dissolved oxygen. [1 mark]

Rusting requires both oxygen and water to occur. Absence of either of them will not cause any rusting. [1 mark]