Definition of a non-ferrous mineral:

A non-ferrous mineral refers to any mineral that does not contain iron. These minerals are usually used in various industrial applications due to their unique properties and characteristics. They can be found in different forms, such as ores or metals, and are essential for the production of various goods and materials.

Explanation of the given options:

a) Iron ore: Iron ore is a ferrous mineral, not a non-ferrous mineral. It is a primary source of iron and is widely used in the production of steel and other iron-based products. Therefore, it is not the correct answer to the question.

b) Copper: Copper is a non-ferrous mineral and the correct answer to the question. It is a reddish-brown metal that is highly conductive and malleable. Copper is used in various industries, including electrical, plumbing, and construction. It is an essential component in the production of wires, pipes, and electrical equipment.

c) Manganese: Manganese is a non-ferrous mineral. It is a gray-white metal that is often used in the production of steel and other alloys. Manganese is also used in the manufacturing of batteries, ceramics, and fertilizers. It helps improve the strength and durability of materials.

d) Chromite: Chromite is a ferrous mineral, not a non-ferrous mineral. It is a dark-colored mineral that contains chromium, which is used in the production of stainless steel, alloys, and pigments. Therefore, it is not the correct answer to the question.

Conclusion:

Based on the given options, the correct answer to the question is option 'B' - Copper. Copper is a non-ferrous mineral that is widely used in various industries due to its excellent conductivity and malleability. It plays a crucial role in the production of electrical equipment, plumbing materials, and construction components.