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An element X on exposure to moist air turns reddish-brown and a new compound Y is formed.

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An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are 

(a) X = Fe, Y = Fe2O3 

(b) X = Ag, Y = Ag2S 

(c) X = Cu, Y = CuO 

(d) X = Al, Y = Al2O3

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(a) X = Fe, Y = Fe2O3

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