🔥 Kinetic Theory of Gases – Stage 2 (Page 10)

                                            

This page is designed to eliminate last-moment mistakes and sharpen your JEE Advanced decision-making skills.

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1️⃣ Biggest Examiner Trap: Mixing Speed & Energy

Golden Rule:

• Speed ∝ √T / √M
• Average KE ∝ T only

❌ If mass is mentioned → speed involved ❌ If only temperature → energy involved

✔ This single rule saves 3–4 marks every year.

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2️⃣ Pressure Concept – Absolute Clarity

Pressure is due to:

• Change in momentum
• Number of collisions per second
• Area of container wall

Pressure does NOT directly depend on:

• Gravity ❌
• Shape of container ❌
• Direction of motion ❌

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3️⃣ PYQ Trap: Same Pressure ≠ Same Speed

Two gases at same pressure:

• Speed may differ ✔
• Temperature may differ ✔
• Density may differ ✔

❌ Pressure alone is insufficient information.

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4️⃣ RMS, Average & Most Probable – Instant Elimination

Always remember:

v_mp < v_avg < v_rms

⚠ Any option violating this order → eliminate immediately.

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5️⃣ Mean Free Path – Subtle Questions

Mean free path depends on:

• Molecular diameter
• Number density

At constant pressure:

• Temperature ↑ → Density ↓ → Mean free path ↑

✔ Temperature effect is indirect.

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6️⃣ Multi-Correct Killer Concept

True statements:

• Average KE same at same T ✔
• Speeds distributed randomly ✔
• All molecules have equal KE ❌
• Gas molecules move in straight lines between collisions ✔

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7️⃣ Zero-Calculation Strategy

In JEE Advanced:

• Prefer ratios
• Avoid numbers unless compulsory
• Check units → dimensional hint

💡 Many problems are conceptual, not numerical.

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8️⃣ Final One-Line Memory Capsule

• Temperature → Energy
• Mass → Speed
• Collisions → Pressure
• Density → Mean free path

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9️⃣ Exam Hall Checklist (KTG)

• Identify what is asked: speed / energy / pressure
• Check constant conditions (T, P, V)
• Use order relations
• Eliminate wrong options first

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🎯 Stage 2 COMPLETED – You are now JEE Advanced ready in KTG.

📚 IIT–JEE Physics Complete Library (Class XI)

Curated for IIT-JEE Advanced Aspirants
Concepts • Numericals • Objective Questions • Revision Capsules

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🔥 Kinetic Theory of Gases (KTG) – Complete Library

1. KTG – Part 1
2. KTG – Part 2
3. KTG – Part 3
4. KTG – Part 4
5. KTG – Part 5
6. KTG – Part 6
7. KTG – Part 7
8. KTG – Special Notes
9. KTG – Part 9
10. KTG – Part 10
11. KTG – Part 11
12. KTG – Part 12
13. KTG – Part 13
14. KTG – Part 14
15. KTG – Part 15
16. KTG – Part 16
17. KTG – Part 17
18. KTG – Part 18
19. KTG – Part 19
20. KTG – Part 20
21. KTG – Part 21
22. KTG – Part 22
23. KTG – Part 23
24. KTG – Part 24
25. KTG – Part 25
26. KTG – Part 26
27. KTG – Part 27
28. KTG – Part 28
29. KTG – Part 29
30. KTG – Part 30

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📐 Properties of Matter – Complete IIT-JEE Library

1. Properties – Part 1
2. Properties – Part 2
3. Properties – Part 3
4. Properties – Part 4
5. Properties – Part 5
6. Properties – Part 6
7. Properties – Part 7
8. Properties – Part 8
9. Properties – Part 9
10. Properties – Part 10
11. Properties – Part 11
12. Properties – Part 12
13. Properties – Part 13
14. Properties – Part 14
15. Properties – Part 15
16. Properties – Part 16
17. Properties – Part 17
18. Properties – Part 18
19. Properties – Part 19
20. Properties – Part 20
21. Properties – Part 21
22. Properties – Part 22
23. Properties – Part 23
24. Properties – Part 24
25. Properties – Part 25

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🌟 Master & Mega Physics Libraries

• IIT-JEE Physics Master Library
• Physics Complete Mega Library
• SHM Complete Library
• Waves – JEE Advanced Library
• Gravitation Library
• Momentum & Collisions Library
• Centre of Mass Library
• Work Energy Power Library

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