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Class 9 Chemistry MCQs Preparation for MDCAT NUMS and All Boards | Study With Me In Pakistan
Master Class 9 Chemistry MCQs for MDCAT/NUMS with key concepts like electronic configuration, periodic trends, and chemical bonding explained through examples.
Watch on YouTube ↗Key takeaways
- 🎯Elements in Group 2A tend to lose their two outer electrons to form a +2 ion, as completing the octet by gaining electrons is less energetically favorable than losing the few valence electrons.01:31
- 🚀Memorize the trends in ionization energy, electron affinity, and electronegativity across periods and down groups. 📈02:02
- 📈Trends in the periodic table: Ionization energy, electron affinity, and electronegativity increase from left to right across a period and from bottom to top within a group.02:02
- 💡The energy of subshells generally increases with the principal quantum number (n) and decreases with increasing azimuthal quantum number (l), meaning lower shells and s-subshells have lower energy.02:41
- 💡Understand the concept of a mole as a fixed number of particles ($6.022 imes 10^{23}$) rather than a mass measure. 🔍04:45
- 🔍A mole is a fixed number of particles (Avogadro's number, $6.022 imes 10^{23}$), not a measure of mass; the mass of one mole varies depending on the element's atomic mass.04:45
Chapters
- 0:00🎯 Introduction and First Set of MCQs
- 0:37🎯 Electronic Configuration and Atomic Numbers
- 2:02🎯 Ionization Energy and Periodic Trends
- 2:34🎯 Electronegativity and Elements in Group 17
- 3:20🎯 Lowest Energy Subshells
- 3:33🎯 Applications of Isotopes and Uranium Used in Reactors
- 4:29🎯 Moles of Oxygen Molecules
- 5:27🎯 Charles's Law and Gas Behavior
- 10:49🎯 Hydrogen Bonding in Water
- 12:05🎯 Metallic and Non-metallic Characteristic Trends
- 14:18🎯 Boiling Point and Atmospheric Pressure
- 24:44🎯 Oxidation Number Prediction in X (Atomic configuration 3s2 3p4)
- 25:00🎯 Oxidation Number of Chromium in K2Cr2O7
- 25:32🎯 Electron Gain in Group 16 Elements
- 26:12🎯 Crystalline vs. Amorphous Solids
- 27:10🎯 Halon with Lowest Electronegativity
- 27:43🎯 Element with Electronic Configuration 1s² 2s² 2p⁶ 3s² 3p⁶
- 27:46🎯 Electronic Configuration and Periods
- 28:15🎯 Elements with Same Valence Shell Electron Configuration
- 35:48🎯 Types of Bonds in HCN
- 36:50🎯 Polarity of Bonds in Molecules
- 38:00🎯 Summary and Final Remarks
The digest
This preparation session provides detailed explanations and solutions to 36 multiple-choice questions (MCQs) from Class 9 Chemistry, designed for students targeting MDCAT, NUMS, and various board exams in Pakistan. The video systematically covers foundational chemistry topics such as electronic configuration, periodic trends, chemical bonding, gas laws, isotopes, solutions, and related principles. It emphasizes understanding over rote memorization and aims to equip students with both conceptual clarity and exam-ready confidence.
Key Concepts and Detailed Explanations
Keep reading in The Digest
The full 8-minute article, 41 more sections, and every new episode from Study With Me and the creators you follow.
- 1. Charged Ions Formation in Group 2A Elements (00:14–01:50)
- 2. Subshells with Lowest Energy and Periodic Trends (01:50–03:29)
- 3. Isotopes Used in Nuclear Reactors (03:30–04:26)
- 4. Number of Molecules in One Mole of Oxygen Gas (04:26–05:23)
- 5. Charles’ Law and the Constant Variable (05:23–06:20)
- 6. Determining Most Dilute Solution by Molarity (06:20–06:58)
- 7. Principle of Pressure Cooker Operation (06:58–08:10)
- 8. Calculating Molarity from Given Mass and Volume (08:10–09:12)
- 9. Oxidation State of Sulfur in Hydrogen Sulfide ($H_2S$) (09:12–10:05)
- 10. Hydrogen Bonding in Compounds — Water as the Example (10:05–12:02)
- 11. Trends in Metallic Character Down a Group (12:02–13:13)
- 12. Highest Electronegativity in Group 7A (Halogens) (13:13–13:40)
- Second Set of MCQs - Gas Laws, Solutions, and Chemical Properties (13:40–23:11)
- 13. Boyle’s Law Application (13:40–14:10)
- 14. Boiling Point Relative to Atmospheric Pressure (14:10–15:13)
- 15. Identifying Polar Solvent with Hydrogen Bonding (15:13–16:43)
- 16. Moles Present in 250 cm³ of 1 Molar Sodium Hydroxide Solution (16:43–18:27)
- 17. Definition and Example of Oxidizing Agent (18:27–19:30)
- 18. Subshells Present in L Shell (19:30–20:15)
- 19. Radioactive Isotope for Tumor Diagnosis (20:15–20:30)
- 20. Identifying Covalent Compounds via Electron Sharing (20:30–21:30)
- 21. Predicting Group and Period from Electronic Configuration (21:30–22:26)
- 22. Reason Atoms React — Attaining Stability (22:25–23:11)
- Third Set of MCQs - Chemical Bonding, Periodic Table, and More (23:11–38:00)
- 23. Properties of Nonmetals (23:11–23:57)
- 24. Branch of Chemistry to Analyze Purity of Glucose (23:57–24:46)
- 25. Oxidation Number of Chromium in $K_2Cr_2O_7$ (24:46–25:56)
- 26. Identifying Crystalline vs Amorphous Solids (25:56–27:00)
- 27. Halogen with Lowest Electronegativity (27:00–27:36)
- 28. Identifying Element by Electronic Configuration (27:36–28:13)
- 29. Similar Chemical Properties and Electron Configuration (28:13–29:01)
- 30. Calculating Sodium Hydroxide Mass for 5 Molarity Solution (29:01–30:00)
- 31. Process by Which Metal Loses Electron (30:00–31:22)
- 32. Identifying Formula Unit Among Compounds (31:22–33:03)
- 33. Mass Number Dependence on Atomic Particles (33:03–33:32)
- 34. Cause of Shielding Effect in Atoms (33:32–34:39)
- 35. Classifying Milk as Colloid (34:39–35:45)
- 36. Identifying Bond Type in Hydrogen Cyanide ($HCN$) (35:45–37:54)
- Key Frameworks and Mental Models
- Practical Implications & Takeaways
- Action-Oriented Summary: Steps to Prepare Effectively
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