State similarities between Li and Mg

State similarities between Li and Mg

1.  Both form normal oxides when they burn in oxygen.

4Li (s)  + O₂ (g) → 2Li₂O (s)

2Mg (s) + O₂ (g) → 2MgO (s)

2. The both react with nitrogen to form nitrides

3Mg (s) + N₂(g) → Mg₃N₂ (s)

6Li(s) + N₂(g) → 2Li₃N

3. Their carbonates, hydroxides and peroxides readily decompose to the oxides on heating.

Li₂CO₃ (s) → Li₂O (s) + CO₂ (g)

MgCO₃ (s) → MgO (s) + CO₂ (g)

4. Their nitrates decompose on heating to give oxides, nitrogen dioxide and oxygen.

4LiNO₃ (s) → 2Li₂O(s) + 4NO₂ (g) + O₂ (g)

2Mg(NO₃)₂ (s) → 2MgO(s) + 4NO₂ (g) + O₂ (g)

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