Sigma Percentile
JEE Main 2019
LEVELJEE Main

Animated Solution for Chemistry - Metallurgy: The one that is not a carbonate ore is

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Visualized Solution

  • We need to identify the ore that does not contain the carbonate () group.

  • A carbonate ore contains the carbonate anion, .
  • We will inspect the chemical formula of each given option.

  • Siderite: (Contains )
  • Calamine: (Contains )

  • Malachite:
  • It is a basic carbonate ore and contains the group.

  • Bauxite:
  • It is a hydrated oxide ore of Aluminium.
  • It does NOT contain the group.

  • Bauxite is the only ore among the options that is not a carbonate ore.

  • Memorizing the chemical formulas of common ores is essential for solving such direct questions in JEE.

The Sigma Insight: Ores

Solution Diagram

The Quest for the Carbonate Group

In the fascinating world of metallurgy, identifying the correct ore is the very first step toward extracting a pure metal. This question presents us with a classic lineup of suspects and asks us a simple yet crucial question: Which of these is NOT a carbonate ore?
To solve this, we need to recall what makes an ore a "carbonate" ore. Simply put, a carbonate ore must contain the carbonate anion, which is chemically represented as . Our mission is to interrogate the chemical formula of each option and see if the carbonate group is hiding inside.

Interrogating the Suspects

Let's bring our suspects to the stand one by one:
1. Siderite: This is a well-known ore of iron. Its chemical formula is . As we can clearly see, the group is right there. Siderite is definitely a carbonate ore.
2. Calamine: This is an important ore of zinc. Its chemical formula is . Once again, the carbonate group is present. Calamine is also a carbonate ore.
3. Malachite: This beautiful green ore is a source of copper. Its formula is a bit more complex: . It is technically a basic carbonate ore because it contains both carbonate and hydroxide groups. However, since the group is present, it qualifies as a carbonate ore for our classification.

The Odd One Out

Finally, we arrive at Bauxite. Bauxite is the primary commercial ore of aluminium. If we recall its chemical composition, it is a hydrated aluminium oxide. Its general formula is written as (or sometimes as ).
Do you see a group anywhere in that formula? Absolutely not! Bauxite is an oxide ore, not a carbonate ore.

The Final Verdict

By systematically checking the chemical formulas, we have successfully unmasked the imposter. Bauxite is the only ore in the given list that does not contain a carbonate group.
Questions like these are highly scoring in competitive exams like JEE. They test your direct memory of fundamental chemical facts. Make sure you have a solid grip on the common ores of important metals like Iron, Copper, Zinc, and Aluminium!

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