Q.111 Chemistry ⭐ 360° Option Elimination Active

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NEET 2020 Chemistry Question 111 Solution

Topic: General Principles and Processes of Isolation of Elements · Official NTA Booklet Code E1

Question

Identify the correct statement from the following:

(1)Wrought iron is impure iron with 4% carbon.
(2)Blister copper has blistered appearance due to evolution of CO2.
(3)Vapour phase refining is carried out for Nickel by Van Arkel method.
(4)Pig iron can be moulded into a variety of shapes.

✓

Verified Against NTA Final Answer Key

Option (4) : Pig iron can be moulded into a variety of shapes.

📚 General Principles and Processes of Isolation of Elements Medium

📋 Given Parameters & Problem Setup

Topic General Principles and Processes of Isolation of Elements (Metallurgy)

Question Objective Identify the CORRECT statement from the given choices

⚡

The 30-Second Exam Hall Shortcut: ⚡ "Eliminate False Statements: Wrought iron is purest (<0.2% C); Blister copper is due to SO2; Ni refined by Mond process!"

⏱️ 25 seconds

Statement (1) is false because Wrought iron is the PUREST commercial iron (<0.2% C), not 4% C (Pig iron has 4% C). Statement (2) is false because blister copper gets blisters due to evolution of $SO_2$ , NOT $CO_2$ . Statement (3) is false because Nickel is refined by MOND process (Van Arkel is for Zr and Ti). By elimination, Statement (4) is the official correct statement! Mark Option (4) in 10 seconds.

1 Check Statement 1: Wrought iron is the purest commercial form (<0.2% C) -> Statement 1 is FALSE.

2 Check Statement 2: Blisters on copper are due to evolution of SO2 gas -> Statement 2 is FALSE.

3 Check Statement 3: Nickel is refined by Mond process; Van Arkel is for Ti and Zr -> Statement 3 is FALSE.

4 Statement 4: Pig iron can be melted and cast/moulded into a variety of shapes (in fact, pig iron/cast iron is historically cast into ingots/pigs and diverse shapes) -> Statement 4 is TRUE.

5 Select Option (4).

🛡️

Why You Can 100% Trust This Shortcut: NCERT Chemistry · General Principles and Processes of Isolation of Elements (Extraction of Iron and Refining)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Evaluate Statement (1): Wrought Iron Carbon Content

The iron obtained from blast furnace is pig iron, which contains about 4% carbon and many impurities (S, P, Si, Mn). Wrought iron (malleable iron) is the purest form of commercial iron, containing less than 0.2-0.5% carbon, prepared by oxidising impurities in a reverberatory furnace lined with haematite. Thus, Statement (1) is completely false.

Step 2

Evaluate Statement (2): Blister Copper Appearance

During copper smelting in the Bessemer converter, the auto-reduction reaction occurs: $2\text{Cu}_2\text{O} + \text{Cu}_2\text{S} \to 6\text{Cu} + \text{SO}_2\uparrow$ As the molten copper solidifies, dissolved $\text{SO}_2$ escapes, creating blisters on the surface (blister copper). Statement (2) falsely claims the blisters are due to $\text{CO}_2$ .

Step 3

Evaluate Statement (3): Refining of Nickel

Nickel is refined by the Mond Process, where it is heated with carbon monoxide to form volatile nickel tetracarbonyl ( $\text{Ni(CO)}_4$ ). The Van Arkel method is used for refining zirconium ( $\text{Zr}$ ) and titanium ( $\text{Ti}$ ) via their volatile iodides. Thus, Statement (3) is false.

Step 4

Evaluate Statement (4): Pig Iron Moulding

Pig iron obtained from the blast furnace is tapped into moulds (historically named "pigs" and "sows") and can be melted and moulded into diverse commercial shapes and castings (or converted into cast iron and steel). Hence, Statement (4) is the designated correct statement in NTA official key.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 A

✗ Incorrect

Verdict & Scientific Reason:

False; wrought iron is the PUREST commercial form of iron containing <0.2% carbon; pig iron has 4% carbon.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing pig iron (4% C) with wrought iron (<0.2% C).

2 B

✗ Incorrect

Verdict & Scientific Reason:

False; the blistered appearance is due to the evolution of sulphur dioxide ( $\text{SO}_2$ ), not $\text{CO}_2$ .

⚠️

Student Fallacy (Why candidates pick this trap): Overlooking the chemical identity of the evolved gas (SO2 vs CO2).

3 C

✗ Incorrect

Verdict & Scientific Reason:

False; Nickel is refined by the Mond process using CO; Van Arkel method is used for Ti and Zr using iodine.

⚠️

Student Fallacy (Why candidates pick this trap): Swapping Mond process with Van Arkel method.

4 D

✓ 100% Correct

Verdict & Scientific Reason:

Factually accepted official statement; pig iron can be cast/moulded into a variety of shapes.

💡

Why this is airtight: None; clean elimination of the three blatantly false alternatives.

⚠️

NTA Trap Alert: Mond vs Van Arkel Refining

- Mond Process: Nickel ( $\text{Ni}$ ) using $\text{CO}$ . - Van Arkel Method: Zirconium ( $\text{Zr}$ ) and Titanium ( $\text{Ti}$ ) using $I_2$ . - Blister copper: Blisters from $\text{SO}_2$ , NOT $\text{CO}_2$ !

🛡️ How to avoid the -1 mark: Mnemonic: "Mond = Nickel; Van Arkel = Ti & Zr; Blisters = SO2"!

📖

Core NEET Syllabus Standard

Chemistry · General Principles and Processes of Isolation of Elements Standard Benchmark

Core Scientific Principle Tested:

Syllabus Focus: Metallurgy Statements: Pig Iron, Cast Iron, Blister Copper & Vapour Phase Refining

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2020 Chemistry Question 111 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Eliminate False Statements: Wrought iron is purest (<0.2% C); Blister copper is due to SO2; Ni refined by Mond process!"

Step-by-Step Rigorous Workflow & Mathematical Proof

Evaluate Statement (1): Wrought Iron Carbon Content

Evaluate Statement (2): Blister Copper Appearance

Evaluate Statement (3): Refining of Nickel

Evaluate Statement (4): Pig Iron Moulding

360° Option Elimination Engine Key Feature

NTA Trap Alert: Mond vs Van Arkel Refining

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — General Principles and Processes of Isolation of Elements

Temperature Zones and Reactions in the Blast Furnace

Refining of Metals: Distillation for Low-Boiling and Liquid Metals

Metallurgy of Iron: Maximum Temperature Achieved in Blast Furnace

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