General Knowledge - General Science - Discussion

Copper, zinc & tin is right answer.

No. Because alloys of gunmetal are copper, tin, zinc.

I think gun metal should contain iron also.

Gunmetal, also known as red brass in the United States,

[1] is a type of bronze " an alloy of copper (88%), tin (10%), and zinc (2%).

[2] Originally used chiefly for making guns, gunmetal was eventually superseded by steel. Gunmetal casts and machines well and is resistant to corrosion from steam and salt water,

[3] and is used to make steam and hydraulic castings, valves, and gears, and also statues and various small objects, e.g. buttons. It has a tensile strength of 221 to 310 MPa, a specific gravity of 8.7, a density 8,719 kg/m3, and a Brinell hardness of 65 to 74.

Copper zinc tin is a suitable option of among them.

Gun metals : copper and tin.

Gun metal are made by Bronze and Tin.

Bronze : Copper + Zinc.

Gun Metal : Copper+Zinc+Tin.

Gun metals is also called as red brass and the composition present in it are copper 88% tin 10% and zinc 2%. Among the given option cu and sn are matched.
So option D is correct.