Question

to prevent rusting of layer .... applied on iron sheet​

Answer 1

Answer:

Metal starts getting rusted due to regular exposure to air. In order to prevent rusting, a layer of zinc is always applied on iron sheets. As zinc starts rusting earlier in comparison to iron, a layer of zinc is applied to prevent further rusting. This method is called galvanization.

Explanation:

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Answer 2

Answer:

a layer of zinc oxide is brushed on its surface