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(a) Give reason why copper is used to make hot water tanks but steel (an alloy of iron) is not.

(b) Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

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(a) Copper does not corrode easily in the presence of water but steel rusts in the presence of water.

(b) The surface of some metals acquires a dull appearance when exposed to air b ecause of the formation of an oxide layer on the surface of the metal.

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