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Question
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Solution
| Copper | Magnesium |
| Copper does not react with dilute sulphuric acid as its reduction potential is higher than that of hydrogen. | Magnesium metal dissolves readily in dilute sulphuric acid to form solutions containing the aquated Mg(II) ion together with hydrogen gas, H2. |
| Copper does not displace hydrogen from non-oxidising acids like HCl or dilute H2SO4. | Corresponding reactions with other acids such as hydrochloric acid also give the aquated Mg(II) ion. |
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