1. Copper, zinc and iron
  2. Iron, nickel and copper
  3. Iron, lead and tin
  4. Iron, aluminium and magnesium
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1 Answers

Answer: Option 1

A brass alloy consisting of copper (55%), zinc (41 - 43%) and iron (1 - 3%), with the balance consisting of various other metals. The proportions used make the material harder and suitable for valves and bearings.

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