Q13 of 65 Page 18

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

Silver articles turn black after prolonged exposure to air due to the reaction of sulphur present in air. Silver reacts with sulphur to form dark grey to black silver sulphide.

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11

Which of the following metals exist in their native state in nature?

(i) Cu


(ii) Au


(iii) Zn


(iv) Ag

 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

 14

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

 15

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