Alloys

- Brass is an alloy of copper and zinc, not copper and nickel.
- Bronze is an alloy of copper and tin, not copper and zinc.
- German silver is an alloy of copper, zinc, and nickel.
- Brass is indeed an alloy of copper and zinc.

- The alloy formed by lithium with magnesium (Mg) is called magnesium-lithium alloy, which is used in the making of armour plates. Hence, option (1) is correct.
- Lead (Pb), Aluminum (Al), and Tin (Sn) are not used in the formation of such alloys for armour plates. Therefore, options (2), (3), and (4) are incorrect.