Q.99 Chemistry · Section B ⭐ 360° Option Elimination Active

NEET 2024 Chemistry Question 99 Solution

Topic: Coordination Compounds · Official NTA Booklet Code T1

Question

Given below are two statements: Statement I: [Co(NH₃)₆]³⁺ is a homoleptic complex whereas [Co(NH₃)₄Cl₂]⁺ is a heteroleptic complex. Statement II: Complex [Co(NH₃)₆]³⁺ has only one kind of ligands but [Co(NH₃)₄Cl₂]⁺ has more than one kind of ligands. In the light of the above statements, choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (3) : Both Statement I and Statement II are true.

📚 Coordination Compounds Easy

📋 Given Parameters & Problem Setup

Complex 1 [Co(NH3)6]³⁺

Complex 2 [Co(NH3)4Cl2]⁺

Statement I [Co(NH3)6]³⁺ is a homoleptic complex whereas [Co(NH3)4Cl2]⁺ is a heteroleptic complex.

Statement II Complex [Co(NH3)6]³⁺ has only one kind of ligands but [Co(NH3)4Cl2]⁺ has more than one kind of ligands.

⚡

The 30-Second Exam Hall Shortcut: ⚡ Homo vs Hetero Direct Definition

⏱️ Save ~30 seconds

Homo = Same (only one kind of ligand -> [Co(NH3)6]³⁺); Hetero = Different (more than one kind of ligand -> [Co(NH3)4Cl2]⁺)! Both statements are completely TRUE!

1 Homoleptic complex: Complex in which the metal atom or ion is bound to only one kind of donor groups/ligands.

2 [Co(NH3)6]³⁺ has only NH3 ligands -> Homoleptic complex.

3 Heteroleptic complex: Complex in which the metal atom or ion is bound to more than one kind of donor groups/ligands.

4 [Co(NH3)4Cl2]⁺ has two kinds of ligands (four NH3 and two Cl⁻) -> Heteroleptic complex.

5 Statement I accurately classifies both complexes -> TRUE.

6 Statement II gives the exact NCERT textbook definition -> TRUE.

7 Both Statement I and Statement II are true -> Option (3) in 3 seconds!

🛡️

Why You Can 100% Trust This Shortcut: NCERT Chemistry · Coordination Compounds (Definitions of coordination entity: homoleptic and heteroleptic complexes).

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Definition of Homoleptic Complexes

Homoleptic complexes are coordination entities in which a central metal ion is coordinated to only one chemical type of donor atom or ligand. In [Co(NH3)6]³⁺, all six coordination sites are occupied exclusively by neutral ammonia (ammine) molecules:

[\text{Co}(\text{NH}_3)_6]^{3+} \implies \text{Single ligand type (all } \text{NH}_3) \implies \text{Homoleptic Complex}

Step 2

Definition of Heteroleptic Complexes

Heteroleptic complexes are coordination entities in which the central metal ion is bound to two or more distinct types of ligands. In [Co(NH3)4Cl2]⁺, cobalt is coordinated simultaneously to two different ligand species: four neutral ammine ligands and two anionic chlorido ligands:

[\text{Co}(\text{NH}_3)_4\text{Cl}_2]^+ \implies \text{Two distinct ligand types (4 } \text{NH}_3 + 2\;\text{Cl}^\ominus) \implies \text{Heteroleptic Complex}

Step 3

Evaluating Statements

Statement I correctly identifies [Co(NH3)6]³⁺ as homoleptic and [Co(NH3)4Cl2]⁺ as heteroleptic. Statement II accurately provides the foundational definition: [Co(NH3)6]³⁺ has only one kind of ligand while [Co(NH3)4Cl2]⁺ has more than one kind. Both statements are true.

\text{Both Statement I and Statement II are true (Option 3)}

⭐

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 (1)

✗ Incorrect

Verdict & Scientific Reason:

Statement II is the verbatim definition of homoleptic/heteroleptic.

⚠️

Student Fallacy (Why candidates pick this trap): Believing Statement II has a flaw.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Statement I is completely true.

⚠️

Student Fallacy (Why candidates pick this trap): Inverting homoleptic and heteroleptic.

3 (3)

✓ 100% Correct

Verdict & Scientific Reason:

Both statements are indisputable textbook definitions.

💡

Why this is airtight: None.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Both statements are 100% verified truths.

⚠️

Student Fallacy (Why candidates pick this trap): Rejecting basic terminology.

⚠️

NTA Trap Alert: Second-Guessing Obvious Textbook Definitions

Students sometimes think there must be a trick in Statement II and guess Option (1). Statement II is literally the verbatim definition of homoleptic and heteroleptic.

🛡️ How to avoid the -1 mark: Trust foundational definitions: homo = one kind, hetero = mixed kinds.

📖

Core NEET Syllabus Standard

Chemistry Core Inorganic Chemistry · Coordination Compounds Standard Benchmark

Core Scientific Principle Tested:

"Homoleptic complexes contain only one type of ligand; heteroleptic complexes contain more than one type of ligand."

Syllabus Focus: Basic Terminology: Homoleptic and Heteroleptic Complexes

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Homo is one kind alone; Hetero has mixed ligands shown!

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NEET 2024 Chemistry Question 99 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Homo vs Hetero Direct Definition

Step-by-Step Rigorous Workflow & Mathematical Proof

Definition of Homoleptic Complexes

Definition of Heteroleptic Complexes

Evaluating Statements

360° Option Elimination Engine Key Feature

NTA Trap Alert: Second-Guessing Obvious Textbook Definitions

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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