**Extra Questions for NEET Students for Practice Chapter-wise**

As a guide, I am here to provide you with extra questions for NEET students to practice chapter-wise. These questions will help you reinforce your understanding of important concepts and prepare effectively for the NEET exam. Please note that these questions are not exhaustive, but they cover key topics from each chapter.

**Chapter 1: Some Basic Concepts of Chemistry**
1. Define the terms mole and molar mass. How are they related?
2. Calculate the number of moles in 50 grams of sodium chloride (NaCl).
3. Define empirical formula and molecular formula. Give an example of each.
4. What is the percentage composition of carbon in carbon dioxide (CO2)?
5. Explain the concept of limiting reagent with an example.

**Chapter 2: Structure of Atom**
1. State and explain the Bohr's model of an atom.
2. Calculate the wavelength of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 4 to n = 2.
3. What are isotopes? Give an example.
4. Explain the concept of quantum numbers and their significance.
5. Discuss the Pauli exclusion principle and Hund's rule.

**Chapter 3: Classification of Elements and Periodicity in Properties**
1. Define periodicity and explain the periodic table.
2. Explain the trends in atomic radius across a period and down a group.
3. Compare the properties of metals, non-metals, and metalloids.
4. What is the valency of an element? How is it determined?
5. Discuss the periodic trends in ionization energy and electron affinity.

**Chapter 4: Chemical Bonding and Molecular Structure**
1. Explain the formation of a covalent bond with suitable examples.
2. Differentiate between ionic and covalent bonds.
3. Explain the concept of hybridization with examples.
4. What is VSEPR theory? How does it determine the shape of molecules?
5. Discuss the types of intermolecular forces and their impact on physical properties.

These are just a few examples of extra questions for NEET students to practice chapter-wise. Remember to thoroughly study the concepts and refer to your textbook and other reliable sources for more practice questions and explanations.