An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are (1) X = Fe, Y = Fe2O3 (2) X = Ag, Y = Ag2S (3) X = Cu, Y = CuO (4) X = Al, Y = Al2O3

Answer: (1) X = Fe, Y = Fe2O3

The exposure of element X to moist air forms a reddish brown Y which is a new compound is formed. The reddish brown compound is known as rust Fe2O3.

Fe + H2O + O2⟶ Fe2O3

X = Fe and Y = Fe2O3

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