The Question is from neet-chemistry general-principles-and-processes-of-isolation-of-e , and it was created by the author A.RAMA NAGESWARARAO

Question

Which of the following is NOT a concentration method for ores?

A.RAMA NAGESWARARAO · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Ore concentration methods
 **Related Topics**: Metallurgy, Mineral processing
 **Prerequisites**: Basic understanding of ore processing techniques.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify the method that is NOT used for concentrating ores.
**Method & Steps**:
1. Analyze each option to determine if it's a concentration method.
 Reasoning: Concentration methods aim to increase the proportion of valuable minerals in an ore by separating them from unwanted gangue.
2. Evaluate each option:
 a. Calcination: A thermal treatment process used to remove volatile impurities, but it doesn't directly concentrate the ore.
 b. Leaching: A chemical process used to dissolve valuable minerals from the ore, followed by separation and recovery, thus concentrating the valuable component.
 c. Gravity separation: Uses differences in density to separate minerals; heavier minerals are concentrated.
 d. Magnetic separation: Uses magnetic properties to separate magnetic minerals from non-magnetic ones, thus concentrating the magnetic minerals.
3. Identify the option that is not a concentration method.
 Result: Calcination is primarily a purification method, not a concentration method in the sense of increasing the proportion of valuable minerals.  While it can indirectly aid concentration by removing impurities, it's not a primary concentration technique like the others.
 Verification: The remaining options (leaching, gravity separation, and magnetic separation) are all established methods for concentrating ores.
## OPTION ANALYSIS
A ✓: Calcination is a thermal process used to decompose carbonates, hydroxides, and other volatile impurities. It does not directly concentrate the valuable mineral in the ore. 
B :x: Leaching uses solvents to dissolve the desired mineral, separating it from the gangue. This is a common concentration technique.
C :x: Gravity separation uses density differences to separate minerals. Heavier, valuable minerals are concentrated.
D :x: Magnetic separation uses magnetic fields to separate magnetic minerals from non-magnetic ones, thus concentrating the magnetic minerals.
## LEARNING AIDS
 **Common Mistakes**: 
  1.Confusing calcination with roasting: Roasting is a type of calcination, but it can sometimes be used in conjunction with other concentration methods.
  2.Overlooking the subtle difference between purification and concentration: Calcination purifies the ore but doesn't necessarily increase the concentration of the valuable mineral.
 **Quick Tips**:
  1.Remember that concentration methods focus on increasing the proportion of valuable minerals.
  2.Consider the primary purpose of each process – is it to separate, purify, or concentrate?

A.RAMA NAGESWARARAO · Answer

The correct Option is "Calcination"

A.RAMA NAGESWARARAO · Answer

Leaching

A.RAMA NAGESWARARAO · Answer

Gravity separation

A.RAMA NAGESWARARAO · Answer

Magnetic separation

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