Chemistry
Give four examples of compounds with variable valency.
Valency
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Answer
| Metal | Valency | Name of compound formed | Formula |
|---|---|---|---|
| Iron | 2 3 | Ferrous - [Iron (II)] oxide Ferric - [Iron (III)] oxide | FeO Fe2O3 |
| Copper | 1 2 | Cuprous - [Copper (I)] oxide Cupric- [Copper (II)] oxide | Cu2O CuO |
| Mercury | 1 2 | Mercurous - [Mercury (I)] oxide Mercuric - [Mercury(II)] oxide | Hg2O HgO |
| Lead | 2 4 | Plumbous - [Lead (II)] oxide Plumbic - [Lead (IV)] oxide | PbO PbO2 |
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