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प्रश्न
At ordinary temperature the surface of metals such as magnesium, aluminium, zinc etc. is covered with a thin layer. What is the composition of "this layer? State its importance.
लघु उत्तरीय
उत्तर
The thin layer is composed of metal oxides and hydroxides.
Importance: It acts as a protective layer from corrosion for the underlying metal.
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