Similarities in chemical properties of Beryllium (Be) and aluminium (Al).

Similarities in chemical properties of Beryllium (Be) and aluminium (Al).

1.  Both are passive to nitric acid.

2. Both react with NaOH solution to evolve     hydrogen.

Be (s) + 2^–OH (aq) + 2H₂O (l) →  Be(OH)₄^2-(aq) + H₂ (g)

                             ^{beryllate ion}

Al (s) + 2^–OH (aq) + 6H₂O (l) →  2Al(OH)₄^– (aq) + 3H₂(g)

^{aluminate ion}

3. The oxides and hydroxides of beryllium and aluminium are amphoteric

4.  The chlorides are covalent polymeric solids (through dative bonding).  When anhydrous     (BeCl₂)_X  and (AlCl₃)_X which readily dissolve in organic solvents.  They are readily hydrolyzed by water, with evolution of HCl.

5. Beryllium carbide, Be₂C, and aluminium carbide, Al₄C₃, give methane on treatment with water.

Be₂C(s) + 4H₂O(l) →  2Be(OH)₂(s) + CH₄(g)

2Al₄C₃(s) + 12H₂O(l) → 4Al(OH)₃(s) + 3CH₄(g)

6. Similar complexes of beryllium and aluminium have similar stabilities, e.g., BeF₄^2- and AlF₆^3-.

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