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Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

Coating iron or steel with a layer of zinc prevents it from rusting. This process is called galvanization. Water pipes are also galvanized to protect them from corrosion.

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12

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) Au


(ii) Cu


(iii) Na


(iv) K

 13

Silver articles become black on prolonged exposure to air. This is due to the formation of

 15

Stainless steel is very useful material for our life. In stainless steel, iron is mixed with

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If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of