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Match the metals given in column I with the type of corrosion in column II.

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Copper

Aluminum

Iron

Silver

Reddish brown powder

Green coating

Dull, lost shine

Black coating

answer is , , A, .

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Detailed Solution

Corrosion of metals occurs by oxidation of metals to form a metal oxide that gets deposited on the surface. Different metals react with atmospheric oxygen and form layers of their oxides to develop a coating of different forms and colours.

Column I	Column II
(a) Copper	(i) Green coating
(b) Aluminium	(ii) Dull, lost shine
(c) Iron	(iii) Reddish brown powder
(d) Silver	(iv) Black Coating

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