Problem 1 - A Complete Resource Book in Chemistry for JEE Main

Question

Which of the following is an ore of sodium? (a) chile saltpeter (b) carnalite (c) sylvine (d) none of these

Step-by-Step Solution

Answer

None of the listed options are typical ores of sodium.

Step 1: Identify Key Terms

An ore of a metal is a naturally occurring solid material from which the metal can be extracted profitably. In this problem, we need to identify which among the given options is an ore of sodium.

Step 2: Analyze Each Option

- **(a) Chile Saltpeter**: This is primarily sodium nitrate \( (NaNO_3) \). It is not a primary source for sodium extraction in industry.- **(b) Carnalite**: This is a mineral composed of hydrated potassium magnesium chloride \( KCl \cdot MgCl_2 \cdot 6H_2O \). It contains no sodium.- **(c) Sylvine**: This is the mineral form of potassium chloride \( (KCl) \); it doesn't contain sodium either.- **(d) None of these**: If none of the options are ores of sodium, this would be the correct choice.

Step 3: Choose the Correct Answer

Given the analysis, chile saltpeter contains sodium but is not typically considered an ore of sodium due to its composition and practical applications. Carnalite and sylvine do not contain sodium at all. Therefore, considering the definition of an ore and practical economic extraction, the correct answer is (d) none of these.

Key Concepts

Metal Extraction

Metal extraction is a fundamental process in mining and related industries, focusing on isolating metals from their ores. An ore is a naturally occurring mineral or rock that is exploited for its metal content. The goal of extraction is to separate the valuable metal from other elements within the ore.
The process involves several steps:

• **Crushing and Grinding**: The ore is crushed into smaller pieces to facilitate easier separation of metal.
• **Concentration**: The ore is concentrated to enrich the metal content, often through methods like flotation or magnetic separation.
• **Reduction**: This step involves converting the metal in the ore to its pure state, commonly using methods like smelting or electrolysis.

Through these steps, metals are acquired in a form that is useful for various applications, from manufacturing to construction. Understanding metal extraction is crucial, as it affects both the economic value and environmental impact of mining activities.
Effective extraction processes ensure that maximum metal yield is achieved, reducing waste and optimizing resource use.

Economic Geology

Economic geology explores the earth's materials that can be utilized for economic and/or industrial purposes, including metals, minerals, oil, and gas. It assesses these resources for their economic value and feasibility for extraction and processing.
Key aspects include:

• **Resource Evaluation**: Determining the quality, quantity, and extent of ores and minerals.
• **Economic Viability**: Analyzing whether it is financially feasible to extract a specific resource. This includes costs of extraction and market value.
• **Geological Prospecting**: Identifying locations that are rich in valuable minerals through geological surveys and modeling.

Economic geology combines geology with economics to make informed decisions on resource extraction, balancing profitability with environmental stewardship and social responsibility. This science helps industries identify which resources should be developed or conserved, guiding sustainable resource management.

Mineral Resources

Mineral resources are naturally occurring substances from the earth's crust, which have been concentrated over time through geological processes. They are divided into two major categories:

• **Metallic Minerals**: These include ferrous and non-ferrous metals like iron, copper, aluminum, and sodium.
• **Non-metallic Minerals**: Such as sand, gravel, limestone, and clay, which are crucial for industries like construction and manufacturing.

Mineral resources are essential due to their wide-ranging uses in daily life and industry. Sodium, for example, is found in minerals such as feldspar and halite, although not all sodium-containing minerals are viable for sodium extraction. The evaluation of minerals as resources involves assessing their concentration, form, and potential profitability as ores.
It is vital for exploration efforts to focus on sustainable extraction practices to ensure that non-renewable mineral resources are used efficiently, ensuring availability for future generations while minimizing environmental impact.