Question 1 CHEMICAL BONDING AND MOLECULAR STRUCTURE [71] 1.1. Explain the structural geometry of the following hypotheti

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Question 1 Chemical Bonding And Molecular Structure 71 1 1 Explain The Structural Geometry Of The Following Hypotheti 1 (64.84 KiB) Viewed 43 times

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Question 1 Chemical Bonding And Molecular Structure 71 1 1 Explain The Structural Geometry Of The Following Hypotheti 3 (10.76 KiB) Viewed 43 times

Question 1 CHEMICAL BONDING AND MOLECULAR STRUCTURE [71] 1.1. Explain the structural geometry of the following hypothetical molecules with the help of valence shell electron pair repulsion (VSEPR) theory: (a) Sulphur difluoride (SF2) and Xenon hexachloride [6] 1.2. What are the limitations of VSEPR? 14 1.3. Describe the term resonance and its importance. Give two examples of compounds that show this phenomenon [5] 1.4. Describe the principles behind valence bond theory (VB) and its disadvantages. [8] 1.5. Write the Lewis structure for the following compoundsſions: 15) (a) CO,2 (b) NO (c) XeF (d) ICI (e) BF, 1.6. Draw molecular orbital diagram of Cl2. Calculate bond order. What is its magnetism. [8] 1.7. Describe the stability of a chemical substance in terms of: (a) resonance. (b) energy (e) bonding (d) octet rule (e) electron repulsiion (1) geometry [12] 1.8. What does the electronic configuration of an element tell us about its stability, reactivity and physical properties [6] 1.9. Describe factors that contribute to the stability of Hz molecule during its bond formation [8] 1.10. Describe the following: Aufbau principle, Hund's rule and Pauli's exclusion principle 19) Question 2 INORGANIC INSTRUMENTAL ANALYSIS [32] 2.1. Describe basic principles behind nuclear magnetic resonance (NMR), X-ray diffraction (XRD). infrared spectroscopy (IR) and mass spectroscopy (MS). (20) 2.2. Answer the following questions based on four techniques given in 1.3 (a) Name main components of NMR technique and their functions [6] () Give two applications of NMR techniques. [2] (c) in what forms are the results obtained from each instrument? [1] (d) Describe how qualitative and quantitative studies can be carried out with NMR. [2] (e) What type of information can one obtain from NMR data? [2] (What forms or phase (liquid, gas or solid) of sample can be analysed with each technique?[4]

] (5) 1.5. Write the Lewis structure for the following compounds/ions: (a) C032 (b) NOS (c) XeF (d) ICI: (e) BF3 1.6. Draw molecular orbital diagram of Cl2. Calculate bond order. What is its magnetism. [8] 8]