Question

Which of the following statements is false regarding copper / copper alloys ?

Copper has a higher thermal conductivity than aluminum.

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

Machining annealed copper is preferred over machining cold-worked copper, because the harder cold-worked copper tends to wear cutting tools extremely quickly, thereby requiring frequent replacement (additional time and processing costs).

Copper is relatively resistant to corrosion by neutral and even mildly basic water.

The primary use for copper is for electrical applications (transmitting electricity, etc.).

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

Answer 1

according to me all of the statements given above are correct ( to the best of my knowledge)

Answer 2