The Question is from neet-chemistry general-principles-and-processes-of-isolation-of-e , and it was created by the author THIRUPATHI REDDY

Question

Which of the following ores is concentrated using magnetic separation after roasting?

THIRUPATHI REDDY · Accepted Answer

## CORE INFORMATION
✓ **Answer**: 2 (Copper pyrites)
## CONCEPT FRAMEWORK
 **Primary Concept**: Ore concentration techniques
 **Related Topics**: Roasting of ores, magnetic properties of materials
 **Prerequisites**: Understanding of different ore types and their properties.
## SOLUTION PATHWAY
**Given Information**:
  The question asks which ore is concentrated using magnetic separation *after* roasting.
  Options: Bauxite, Copper pyrites, Galena, Cinnabar
**Method & Steps**:
 1. **Understanding Roasting:** Roasting is a process where sulfide ores are heated in the presence of air to convert sulfides into oxides. This often changes the magnetic properties of the ore.
  Reasoning: Roasting converts metal sulfides to metal oxides, which may or may not be magnetic.
 2. **Magnetic Separation:** Magnetic separation is a technique used to separate magnetic materials from non-magnetic materials.
  Working:  We need to identify which of the given ores, after roasting, becomes magnetic enough for separation by magnetic fields. 
 3. **Analyzing Options:**
  Bauxite ($Al_2O_3 \cdot 2H_2O$):  Bauxite is an aluminum ore and is not typically processed by roasting and magnetic separation.
  Copper pyrites ($CuFeS_2$): Roasting copper pyrites converts it to iron and copper oxides ($Fe_2O_3$ and $CuO$).  Iron oxide ($Fe_2O_3$) is weakly ferromagnetic and can be separated magnetically. 
  Galena ($PbS$): Galena is a lead sulfide ore. Roasting produces lead oxide ($PbO$), which is not magnetic.
  Cinnabar ($HgS$): Cinnabar is a mercury sulfide ore. Roasting produces mercury ($Hg$), which is not magnetic.
  Result: Copper pyrites is the only ore among the given options that, after roasting, yields a magnetic component ($Fe_2O_3$) allowing for magnetic separation.
  Verification: The magnetic susceptibility of iron oxide allows for effective separation using magnetic fields.
 ## OPTION ANALYSIS
A :x: Bauxite is not processed by roasting and magnetic separation.
B ✓: Copper pyrites, after roasting, produces magnetic iron oxide ($Fe_2O_3$), enabling magnetic separation.
C :x: Galena's roasting product ($PbO$) is not magnetic.
D :x: Cinnabar's roasting product ($Hg$) is not magnetic.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing roasting with other processes like leaching or froth flotation.
  How to avoid: Understand the specific chemical changes involved in each process.
  2.Assuming all metal oxides are magnetic.  
  How to avoid: Learn the magnetic properties of common metal oxides.
 **Quick Tips**:
  1.Remember that roasting converts sulfides to oxides, which can alter magnetic properties.
  2.Focus on the magnetic properties of the *products* of roasting, not the original ores.

THIRUPATHI REDDY · Answer

Bauxite

THIRUPATHI REDDY · Answer

The correct Option is "Copper pyrites"

THIRUPATHI REDDY · Answer

Galena

THIRUPATHI REDDY · Answer

Cinnabar

NEET Chemistry General Principles And Processes Of Isolation Of Elements MCQs

Select Topic

Question Tags

Question Tags

Question Tags

Question Tags

NEET Subjects

Our Bots

Company