Problem 15 - 43 Years JEE ADVANCED (1978-2020) + JEE MAIN Chapterwise & Topicwise Solved Papers Chemistry

Question

The ore that contains both iron and copper is: (a) copper pyrites (b) malachite (c) dolomite (d) azurite

Step-by-Step Solution

Answer

The ore that contains both iron and copper is copper pyrites (a).

Step 1: Understand the Problem

We need to identify an ore from the given options that contains both iron and copper. Ores typically consist of valuable minerals that can include multiple metals depending on their composition.

Step 2: Analyze Each Option

Check each option against the requirement: - (a) Copper Pyrites (Chalcopyrite) is a major copper ore and contains iron. - (b) Malachite is primarily a copper carbonate mineral and does not contain iron. - (c) Dolomite is a carbonate mineral mainly consisting of calcium and magnesium, not copper or iron. - (d) Azurite is a copper carbonate mineral similar to malachite but does not contain iron.

Step 3: Identify the Correct Ore

Copper Pyrites (a) is the ore in the given options that contains both iron and copper. It is also known as Chalcopyrite, with the chemical formula CuFeS2, including both copper (Cu) and iron (Fe).

Key Concepts

Ore Identification

Ore identification is an important skill in the field of chemistry and geology. It involves determining specific ores based on the minerals they contain. Ores are naturally occurring rocks that contain metals or valuable elements which can be profitably extracted.
When identifying ores, you should focus on:

• Composition: What metals or elements are present?
• Physical characteristics: Color, hardness, and texture.
• Source and location: Where is the ore typically found?

For example, in the exercise we examined different ores to identify which contained both iron and copper. This involved understanding the composition of each listed mineral and systematically ruling out those that did not meet the criteria.

Chalcopyrite

Chalcopyrite is a significant ore of copper and is known scientifically as copper pyrites. Its distinctive brass-yellow color and metallic luster can often help identify it in its natural form. The chemical composition of chalcopyrite is CuFeS\(_2\), indicating that it contains copper (Cu), iron (Fe), and sulfur (S).
This mineral is one of the most abundant copper ores and forms the basis of many copper mining operations around the world. It is often found alongside other sulfide minerals in hydrothermal veins, sedimentary, and igneous rocks.
Besides copper, chalcopyrite is also a source of iron production, making it an especially important ore in metallurgy.

Mineral Composition

Understanding mineral composition is key to analyzing ores and their potential value. Mineral composition refers to the specific combination of elements that make up a mineral.
In our example, chalcopyrite's mineral composition of CuFeS\(_2\) means:

• Copper (Cu): Primarily extracted for electrical, plumbing, and machinery applications due to its excellent conductivity and malleability.
• Iron (Fe): Extensively used in construction and manufacturing, particularly in producing steel.
• Sulfur (S): A non-metal element often found in sulfide minerals.

Each element within a mineral can affect its properties and uses. A single ore like chalcopyrite can be an invaluable resource because it offers multiple benefits through its composition.