Question

Name two metals which react with concentrated sodium hydroxide solution to liberate hydrogen gas.

Answer 1

Answer:

Zinc(Zn)

Sodium(Na)

Hope this helped you

Answer 2

Two metals which react with concentrated sodium hydroxide solution to liberate hydrogen gas are Zinc (Zn) and Aluminium(Al).

Explanation:

• Some metals that have a lower reduction such as Alkali metals and transition metals can displace (Sodium) Na to produce hydrogen.

• The Subsequent reactions are as follows:

        $Zn + 2NaOH = Na_2ZnO_2 + H_2$

        $2Al + 2NaOH + 2 H_2O\rightarrow2 NaAlO_2 + 3H_2$

• In these Reactions, the $OH^-$ group is being displaced which is causing the liberation of$H_2$ gas from the reactions.

• The liberated $H_2$ can be checked from keeping a lighter or burner near the mouth of the test tube to hear a pop which is the liberated$H_2$ being burned.

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