Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Arrange the following oxides in a decreasing order of their stability. potassium oxide, sodium oxide, magnesium oxide and calcium oxide [2 Marks]

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Higher is the reactivity of metal, greater will be the stability of its oxide. [1 Mark]

The reactivity order of metals is K>Na>Ca>Mg. Therefore, the decreasing order of the stability of their oxides is potassium oxide>sodium oxide>calcium oxide>magnesium oxide.
[1 Mark]