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

Gun metal is an alloy traditionally used for making guns and various other applications due to its durability and corrosion resistance. The primary metals present in gun metal are:

Copper (Cu): The major constituent of gun metal.
Tin (Sn): Typically included to enhance the strength and corrosion resistance.
Zinc (Zn): Sometimes included to improve casting properties.
Considering the options provided:

(A) Cu, Zn, Ni: This is incorrect because nickel is not a primary component of gun metal.
(B) Cu, Sn, and Zn: This is partially correct, as tin is a key component, but zinc is not always included in traditional gun metal.
(C) Cu, Sn: This is the most accurate answer since copper and tin are the main constituents.
(D) Cu, Al: This is incorrect as aluminum is not typically found in gun metal.
Therefore, the correct answer is (C) Cu, Sn.

Explanation:
Gun metal is an alloy primarily made of copper and tin, with the typical composition being around 88% copper and 12% tin. This combination provides desirable properties such as strength, malleability, and resistance to corrosion.