Q.96 Chemistry ⭐ 360° Option Elimination Active

NEET 2020 Chemistry Question 96 Solution

Topic: Classification of Elements and Periodicity in Properties · Official NTA Booklet Code E1

Question

Identify the incorrect match. Name IUPAC Official Name (a) Unnilunium (i) Mendelevium (b) Unniltrium (ii) Lawrencium (c) Unnilhexium (iii) Seaborgium (d) Unununnium (iv) Darmstadtium

(1)(a), (i)
(2)(b), (ii)
(3)(c), (iii)
(4)(d), (iv)

✓

Verified Against NTA Final Answer Key

Option (4) : (d), (iv)

📚 Classification of Elements and Periodicity in Properties Easy

📋 Given Parameters & Problem Setup

(a) Unnilunium (Z = 101) (i) Mendelevium (Md)

(b) Unniltrium (Z = 103) (ii) Lawrencium (Lr)

(d) Unununnium (Z = 111) (iv) Darmstadtium (Ds)

Question Objective Identify the INCORRECT match

⚡

The 30-Second Exam Hall Shortcut: ⚡ "Element 111 (Unununnium) is ROENTGENIUM (Rg), NOT Darmstadtium (Ds = 110)!"

⏱️ 20 seconds

Un-un-unnium has atomic number Z = 111. The official IUPAC name for element 111 is ROENTGENIUM (Rg). Darmstadtium (Ds) is element 110 (Ununnilium)! Therefore, pair (d), (iv) is the incorrect match. Mark Option (4) in 5 seconds!

1 Unnilunium = 101 -> Mendelevium (Md) (Correct match).

2 Unniltrium = 103 -> Lawrencium (Lr) (Correct match).

3 Unnilhexium = 106 -> Seaborgium (Sg) (Correct match).

4 Unununnium = 111 -> Roentgenium (Rg). Darmstadtium (Ds) is element 110.

5 Match (d), (iv) is INCORRECT. Select Option (4).

🛡️

Why You Can 100% Trust This Shortcut: NCERT Chemistry · Classification of Elements and Periodicity in Properties (Nomenclature of Elements with Atomic Numbers > 100)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

IUPAC Systematic Naming Rules for Z > 100

Roots used: nil = 0, un = 1, bi = 2, tri = 3, quad = 4, pent = 5, hex = 6, sept = 7, oct = 8, enn = 9, ending with "-ium".

Step 2

Decode Element (a): Unnilunium

Un (1) + nil (0) + un (1) + ium = Atomic number 101 ( $\text{Unu}$ ). Official IUPAC name is Mendelevium ( $\text{Md}$ ). Correct match.

Step 3

Decode Element (b): Unniltrium

Un (1) + nil (0) + tri (3) + um = Atomic number 103 ( $\text{Unt}$ ). Official IUPAC name is Lawrencium ( $\text{Lr}$ ). Correct match.

Step 4

Decode Element (c): Unnilhexium

Un (1) + nil (0) + hex (6) + ium = Atomic number 106 ( $\text{Unh}$ ). Official IUPAC name is Seaborgium ( $\text{Sg}$ ). Correct match.

Step 5

Decode Element (d): Unununnium

Un (1) + un (1) + un (1) + ium = Atomic number 111 ( $\text{Uuu}$ ). Official IUPAC name is Roentgenium ( $\text{Rg}$ ). Darmstadtium ( $\text{Ds}$ ) is element 110 (Ununnilium, $Z = 110$ ). Thus, (d) matching with (iv) is incorrect.

⭐

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:

Correct match; element 101 is indeed Mendelevium.

⚠️

Student Fallacy (Why candidates pick this trap): Failing to notice the question asks for the INCORRECT match.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Correct match; element 103 is indeed Lawrencium.

⚠️

Student Fallacy (Why candidates pick this trap): Assuming 103 is not Lawrencium.

3 C

✗ Incorrect

Verdict & Scientific Reason:

Correct match; element 106 is Seaborgium.

⚠️

Student Fallacy (Why candidates pick this trap): Unfamiliarity with trans-fermium element names.

4 D

✓ 100% Correct

Verdict & Scientific Reason:

Factually INCORRECT match (hence the correct answer); element 111 is Roentgenium (Rg), whereas Darmstadtium is element 110.

💡

Why this is airtight: None; precision check on elements 110 and 111.

⚠️

NTA Trap Alert: Element 110 vs Element 111

Z = 110 is Darmstadtium (Ds, Ununnilium). Z = 111 is Roentgenium (Rg, Unununnium). Z = 112 is Copernicium (Cn, Ununbium).

🛡️ How to avoid the -1 mark: Remember: 110 = Darmstadtium; 111 = Roentgenium!

📖

Core NEET Syllabus Standard

Chemistry · Classification of Elements and Periodicity in Properties Standard Benchmark

Core Scientific Principle Tested:

Syllabus Focus: IUPAC Nomenclature and Official Names of Superheavy Elements (Z > 100)

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2020 Chemistry Question 96 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ "Element 111 (Unununnium) is ROENTGENIUM (Rg), NOT Darmstadtium (Ds = 110)!"

Step-by-Step Rigorous Workflow & Mathematical Proof

IUPAC Systematic Naming Rules for Z > 100

Decode Element (a): Unnilunium

Decode Element (b): Unniltrium

Decode Element (c): Unnilhexium

Decode Element (d): Unununnium

360° Option Elimination Engine Key Feature

NTA Trap Alert: Element 110 vs Element 111

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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