The Question is from neet-chemistry general-principles-and-processes-of-isolation-of-e extraction-of-some-metals, and it was created by the author P SRAVAN KUMAR

Question

During the extraction of zinc from its sulphide ore, the roasting process primarily aims to:

P SRAVAN KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Extraction of metals from their ores
 **Related Topics**: Metallurgy, roasting, zinc extraction
 **Prerequisites**: Understanding of chemical reactions, oxidation, and reduction.
## SOLUTION PATHWAY
**Given Information**:
The question focuses on the purpose of the roasting process in zinc extraction from its sulfide ore (ZnS).
**Method & Steps**:
1. Understanding the Roasting Process:
  Reasoning: Roasting is a metallurgical process involving heating the ore in the presence of air (oxygen).  This process usually leads to oxidation.
  Formula/Rule: The general reaction for roasting a sulfide ore is:  $2MS(s) + 3O_2(g) ightarrow 2MO(s) + 2SO_2(g)$, where M represents a metal.
2. Applying to Zinc Sulfide:
  Working: In the case of zinc sulfide (ZnS), roasting converts it to zinc oxide (ZnO) and sulfur dioxide ($SO_2$).
  $2ZnS(s) + 3O_2(g) ightarrow 2ZnO(s) + 2SO_2(g)$
  Key Point: The sulfur dioxide ($SO_2$) is a byproduct that can be further processed or used in other industrial processes.
3. Purpose of Roasting in Zinc Extraction:
  Result: The primary aim of roasting ZnS is to convert it into ZnO, which is a more readily reducible form for subsequent extraction of metallic zinc.  The process also helps remove volatile impurities like arsenic and antimony.
  Verification:  The roasting process prepares the ore for the next stage of extraction, which typically involves reduction with carbon to obtain metallic zinc.
 ## OPTION ANALYSIS
A ✓: Convert zinc sulphide to zinc oxide and remove volatile impurities like arsenic and antimony. This accurately describes the primary aim of roasting.
B :x: Reduce zinc oxide to metallic zinc using carbon. This describes the reduction step, which comes *after* roasting.
C :x: Concentrate the zinc sulphide ore by froth flotation. This is a pre-roasting process used to enrich the ore in zinc sulfide.
D :x: Leach the zinc sulphide ore with sulphuric acid. Leaching is another extraction method, not directly related to roasting.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing roasting with reduction: Roasting is an oxidation process, while reduction is the process of obtaining the metal from its oxide.
  2.Ignoring the removal of impurities: Roasting not only converts the sulfide to oxide but also helps in removing volatile impurities.
 **Quick Tips**:
  1.Remember the general reaction for roasting sulfide ores to help understand the process.
  2.Relate the process of roasting to the overall flow of metal extraction from its ore.

P SRAVAN KUMAR · Answer

The correct Option is "Convert zinc sulphide to zinc oxide and remove volatile impurities like arsenic and antimony."

P SRAVAN KUMAR · Answer

Reduce zinc oxide to metallic zinc using carbon.

P SRAVAN KUMAR · Answer

Concentrate the zinc sulphide ore by froth flotation.

P SRAVAN KUMAR · Answer

Leach the zinc sulphide ore with sulphuric acid.

NEET Chemistry General Principles And Processes Of Isolation Of Elements Extraction Of Some Metals MCQs

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