Chemistry

Daffodil International University Department of Electrical and Electronic Engineering Faculty of Engineering Midterm Examination, Fall-2026 Course Code: 0531-121 Course Title: Chemistry Section: A, B, C, D, E, F Level-Term: L1-T2 Teacher's Initial: AAA, SRA Full Marks: 25 Exam Date: Nov 02, 2026 Time: 1.5 Hours Answer all the questions. Please do not split answers. Q1. Define ionization energy. Discuss the exemption from regular pattern regarding the periodic changes in ionization energy of Mg & Al, P & S. CO-1 C(2) 5 Or Define electron affinity and electronegativity. Discuss the basic differences between these two and similarities in their periodical changes. Q2. (a) Derive the Rhydberg's equation. CO-1 C(1), C(3) 3+2 (b) Define Isotope and Isobar with examples. Q3. (a) The maximum wavelength of a spectral series of H atom is 6563 Å. Determine the series does the spectral line belong to? CO-2 C(3) 2+3 (b) Calculate the number of photons will be required to obtain 1.0 J energy from a radiation of 400 nm wavelength. Q4. Define the metallic bond. Explain the properties of metal. CO-3 C(2) 5 Or Define covalent bond. State some of its examples. Discuss the differences between sigma bond & pi bond. Q5. (a) Define Ionic Bond. Name the bonds a water molecule can have. CO-3 C(1), C(2) 2+3 (b) Given, there are two isomers of an organic compound having different H-bonds. Explain the H-bonds present in O-nitrophenol & P-nitrophenol.