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Select true/false for each of the following statements regarding copper & copper alloys:: (a) copper has a higher elastic modulus than aluminum. (b) the density of copper is closer to that of aluminum than it is to iron. (c) bronze is an alloy of copper and zinc. (d) copper and its alloys form a green tarnish over time, consisting of sulfides and carbonates. (e) copper is relatively resistant to corrosion by neutral and even mildly basic water, making it useful for freshwater plumbing applications.

Answer :

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A: Copper has a higher elastic modulus than aluminum.

True

B: The density of copper is closer to that of aluminum than it is to iron.

False

C: Bronze is an alloy of copper and zinc.

False

D: Copper and its alloys form a green tarnish over time, consisting of sulfides and carbonates.

True

E: Copper is relatively resistant to corrosion by neutral and even mildly basic water, making it useful for freshwater plumbing applications.

True

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