Question

at ordinary temperature the surface of metals such as magnesium, aluminium, zinc etc. are covered with a thin layer what is the composition of the layer​

Answer 1

Explanation:

These metals lie in the mid of the reactivity series and react easily with air ,water or moisture to form their oxide. This oxide layer prevents the metal from further reaction and is not lusturous. This layer can be removed using a sand paper or a regmar sheet.

For example,

Iron reacts with air and water to form ferrous oxide, i.e.,Fe2O3.xH2O

Reaction

4Fe+2O3+6H2O---> 4Fe(OH)3

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