1.

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

Answer»

(a) X = Fe, Y = Fe2O3



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