First year science students 8 chapter imp questions for chemistry ⚗️๐งช
๐ฌ Important Chemistry Questions – First Year (8 Chapters) Chapter 1: Some Basic Concepts of Chemistry 1. Define mole and explain its significance. 2. What is molar mass? How is it calculated? 3. Derive and solve a numerical based on the law of conservation of mass. 4. Define empirical and molecular formula with examples. 5. Solve: Calculate the number of molecules in 5 grams of water. --- Chapter 2: Structure of Atom 1. State the main postulates of Bohr’s atomic model. 2. Derive the energy of an electron in hydrogen atom. 3. What are quantum numbers? Explain their significance. 4. Differentiate between orbit and orbital. 5. Solve: Calculate the wavelength of a photon emitted when an electron jumps from n = 3 to n = 2 in hydrogen. --- Chapter 3: Classification of Elements and Periodicity in Properties 1. Explain Mendeleev’s periodic law. 2. Define and give trends of ionization energy, atomic radius, and electronegativity. 3. How does atomic size vary across a period and down a gro...





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