Question

Metal present in gun metal are:
(A) Cu, Zn, Ni
(B) Cu, Sn and Zn
(C) Cu, Sn
(D) Cu, Al

Answer 1

Hint: Gun metal is so called as it is used for making guns. It is an alloy which is bronze and it is called red bronze, red in colour. So we can tell the composition of bronze and the same will be the composition of gun metal along with some metal which is red in colour due to the presence of some other metal.

Complete Step by step answer:
Gun metal which is used in the manufacture of guns, is called a red bronze alloy.
The alloy of bronze is made up of Copper and tin. Now the red colour to bronze is due to Zinc metal.
Thus the presence of 3 metals of Copper (Cu), Tin (Sn), Zinc (Zn) will form Gunmetal. The amount of each of these is Copper- 88 %, Tin- 8 to 10 %, Zinc- 2 to 4 %.

Hence, the correct option is (B) Cu, Sn and Zn.

Additional Information: This gun metal finds extensive use in making guns and its related parts. It also finds multiple uses as it is corrosion resistant, from steam and salt water. Thus Gun metal has high hardness and high melting point as well. We may add a little amount of lead, so that it can be casted easily into required shapes but this decreases little strength of alloy.

Note: Iron is a common metal which is used in many places, but it is not part of gun metal. For making gun and gun metal, we need specific metals in alloy and we cannot change the metals and its composition. The percentage of each metal is fixed, if we change then the properties of alloy will change and even name will change.