Which of the following is/are NOT an alloy (mark all that apply) ? a. Type M tool steel b. Stainless steel c. Titanium d. Brass e. Inconel

The correct option is : c. Titanium

Explanation:

1. Type M tool: It belongs to the high - speed group of tool steels and used as a cutting tool material. It is a multi component alloy system Fe-C-X, where X is molybdenum.

2. Stainless steel: It is also called inox steel. It is a steel alloy with about 10.5% chromium and 1.2% carbon by mass.

3. Titanium: It is a chemical element, having atomic number 22 and mass 47.867 u. It is silver lustrous transition metal with a symbol Ti.

4. Brass: It is an alloy of zinc and copper metal.

5. Inconel: It is a family of austenitic nickel-chromium based superalloys.

Therefore, Titanium is not an alloy.