Question

Chemical properties of alkali metals when reacting with water and oxygen.​

Answer 1

Answer:

common characteristic of most Alkali Metals is their ability to displace H2(g) from water. This is represented by their large, negative electrode potentials. In this event, the Group 1 metal is oxidized to its metal ion and water is reduced to form hydrogen gas and hydroxide ions. The general reaction of an alkali metal (M) with H2O (l) is given in the following equation:

2M(s)+2H2O(l)⟶2M+(aq)+2OH−(aq)+H2(g)(1)

Answer 2

Required Answer:

❥︎Reaction with water:

» Alkali metals reacts with water to give corresponding hydroxides with the liberation of hydrogen.

2Li + 2H2o ➪ 2LiOH + H2

They also react with alcohol, and alkynes which contain active hydrogens.

The reaction is given in the attachment.↑↑↑

❥︎Reaction with oxygen:

» All the alkali metals on exposure to air or oxygen burn vigorously, forming oxides on their surface.

» Lithium forms only monoxide, sodium forms the monoxide, peroxide, and superoxides.

» These oxides are basic in nature.

=> 4Li + O2 → 2Li2 O (simple oxide).

=> 2Na +O2 → Na2O2 (peroxide).

=> M + O2 → MO2 (superoxides)

(M = K, Rb,Cs)

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