Q.66 Chemistry ⭐ 360° Option Elimination Active

NEET 2025 Chemistry Question 66 Solution

Topic: Solutions · Official NTA Booklet Code 45

Question

Match List - I (Example) with List - II (Type of Solution). List I: A. Humidity; B. Alloys; C. Amalgams; D. Smoke. List II: I. Solid in solid; II. Liquid in gas; III. Solid in gas; IV. Liquid in solid. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (2) : A-II, B-I, C-IV, D-III

📚 Solutions Easy

📋 Given Parameters & Problem Setup

List I (Examples) A. Humidity, B. Alloys, C. Amalgams, D. Smoke

List II (Types of Solutions) I. Solid in solid, II. Liquid in gas, III. Solid in gas, IV. Liquid in solid

⚡

The 30-Second Exam Hall Shortcut: ⚡ Solute-Solvent State Match Shortcut

⏱️ Save ~35 seconds

Humidity = water vapor (liquid) in air (gas) ⟹ Liquid in gas (A-II). Alloys (e.g. brass) = Solid in solid (B-I). Amalgams = mercury (liquid) in sodium (solid) ⟹ Liquid in solid (C-IV). Smoke = carbon particles (solid) in air (gas) ⟹ Solid in gas (D-III)!

1 A. Humidity: Water droplets/vapor suspended in air = Liquid solute in Gas solvent ⟹ A matches II.

2 Look at options: Options (1) and (2) start with A-II.

3 B. Alloys: Homogeneous mixture of metals (e.g. copper in gold) = Solid solute in Solid solvent ⟹ B matches I.

4 Now Option (1) has B-IV, while Option (2) has B-I. This confirms Option (2) immediately!

5 Verify C. Amalgams: Mercury (liquid) dissolved in sodium/metal (solid) = Liquid in solid ⟹ C matches IV.

6 Verify D. Smoke: Carbon soot particles (solid) suspended in atmosphere (gas) = Solid in gas ⟹ D matches III.

7 Select Option (2) in under 10 seconds!

🛡️

Why You Can 100% Trust This Shortcut: Types of Solutions and Physical States of Components (NCERT Chemistry · Solutions).

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Classify Humidity and Smoke (Gaseous Solutions)

Examine solutions where the dispersion medium (solvent) is a gas:

\text{Humidity: } \text{Water (Liquid)} \text{ in Air (Gas)} \implies \text{Liquid in gas (II)}

• A matches II (A-II).
• Smoke: Carbon soot particles (solid) dispersed in air (gas) represents Solid in gas (III).
• D matches III (D-III).

Step 2

Classify Alloys and Amalgams (Solid Solutions)

Examine solutions where the solvent is a solid:

\text{Alloys: } \text{Solid in solid (I)}, \quad \text{Amalgams: } \text{Liquid in solid (IV)}

• Alloys (e.g., brass, bronze, gold-copper) consist of solid solute dissolved in solid solvent (B-I).
• Amalgams consist of liquid mercury (solute) dissolved in solid metal like sodium or zinc (Liquid in solid, C-IV).

Step 3

Synthesize the Complete Match

Assemble the pairs into the final selection:

\text{A-II, B-I, C-IV, D-III} \implies \text{Option (2)}

• Matches Option (2) exactly as specified in NCERT Table 2.1.

⭐

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:

Incorrect. Swaps alloys (Solid in solid) with amalgams (Liquid in solid).

⚠️

Student Fallacy (Why candidates pick this trap): Confusing amalgams with solid alloys.

2 B

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Matches NCERT Table 2.1 verbatim.

💡

Why this is airtight: None; flawless recall of fundamental solution types.

3 C

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Swaps humidity and smoke.

⚠️

Student Fallacy (Why candidates pick this trap): Thinking humidity is solid in gas.

4 D

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Completely scrambled states.

⚠️

Student Fallacy (Why candidates pick this trap): Scrambling states of matter.

⚠️

NTA Trap Alert: Swapping Alloys and Amalgams

Candidates know mercury is a liquid, but sometimes confuse whether the amalgam is "solid in liquid" or "liquid in solid". Because the metal (sodium or zinc) is the dominant solid matrix, amalgams are LIQUID IN SOLID!

🛡️ How to avoid the -1 mark: Remember: Mercury is dissolved INTO solid metal ⟹ Liquid in solid!

📖

Core NEET Syllabus Standard

NEET Chemistry Core Syllabus · Solutions Standard Benchmark

Core Scientific Principle Tested:

"Solutions are classified into 9 types according to the physical states of solute and solvent."

Syllabus Focus: Types of Solutions based on Physical States

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Humidity is Liquid in Gas (II), Alloys are Solid in Solid (I), Amalgams are Liquid in Solid (IV), Smoke is Solid in Gas (III)!

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NEET 2025 Chemistry Question 66 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Solute-Solvent State Match Shortcut

Step-by-Step Rigorous Workflow & Mathematical Proof

Classify Humidity and Smoke (Gaseous Solutions)

Classify Alloys and Amalgams (Solid Solutions)

Synthesize the Complete Match

360° Option Elimination Engine Key Feature

NTA Trap Alert: Swapping Alloys and Amalgams

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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