Question

Explain the order of reactivity of alkali metal with oxygen

Answer 1

Answer:

Explanation:

Group 1 metals (alkaline metals) are very reactive with oxygen and must be stored away from oxygen in order to prevent them from becoming oxidized. The metals at the bottom of the group are more reactive than those at the top. The reactions of a few of these metals are explored in more detail below.

Lithium: Reacts with oxygen to form white lithium oxide in the reaction below.

4Li+O2→2Li2O(2)

Sodium: Reacts with oxygen to form a white mixture of sodium oxide and sodium peroxide. The reactions are shown below.

oxygen with sodium oxide:

4Na+O2→2Na2O(3)

oxygen with sodium peroxide:

2Na+O2→Na2O2(4)

Potassium: Reacts with oxygen to form a mixture of potassium peroxide and potassium superoxide. The reactions are shown below.

Potassium peroxide:

2K+O2→2K2O2(5)

potassium superoxide:

K+O2→KO2(6)

Rubidium and Caesium: Both metals react to produce superoxides through the same process as that of the potassium superoxide reaction.

The oxides of these metals form metal hydroxides when reacting with water. These metal hydroxides make the solution basic or alkaline hence the name alkaline metals.

Oxygen is very reactive with Alkali metals.

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