BSc Chemistry SEM V 2017 18 2017-18 Inorganic Chemistry Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 Attempt any three of the following
   • (A) Explain the point group with a suitable example. 5
   • (B) (a) Explain the vertical plane of symmetry with a suitable example. 2
   • (b) What is inversion centre ? Draw the structure and state whether the 3 following molecules have inversion centre
   • (C) Identify the symmetry elements and assign the point groups to and HCI
   • (D) Draw a neat labelled molecular orbital diagram for BeH, molecule showing the 5 distribution of electrons in various energy levels. Predict its magnetic property
   • (E) What is Walsh Correlation diagram ? Draw a neat and labelled Walsh Correlation 5 diagram for linear and bent AH, type of molecule
   • (F) On the basis of band theory, discuss the electrical properties of conductors and 5
2. Q2 Attempt any three of the following :—
   • (A) Define Packing Density. Show that packing density for simple cubic (sc) lattice is 5
   • (B) For hexagonal close packed structure, calculate — 5 Number of atoms per unit cell (hcp)
   • (b) Atomic radius (r), if length of unit cell is 240 pm
   • (C) (a) relationship between lattice constant and density of the crystal material. 3
   • (b) different types of point defects found in crystals. 2
   • (D) Explain Schottky defect with suitable example. 5
   • (E) Write short note on High Temperature Superconductors (HTSC). 5
   • (F) with the help of suitable diagram :— 5
   • (a). and lattice parameters
3. Q3 Attempt any three of the following
   • (A) Explain the following :
   • (a) Apart from 3+ oxidation state cerium show 4+ while europium shows 2+ 3
   • (b) Zirconium and hafnium are called chemical twins. 2
   • (B) Write note on solvent extraction method of separating lanthanides from each other. 5
   • (C) are inner transition elements ? Give name and electronic configuration of 5
   • (D) Explain the following :
   • (a) Paramagnetic behaviour of lanthanon is not proportional to the number 3 of unpaired electrons
   • (b) Electronic spectra of lanthanon ions exhibit characteristic sharp bands. 2
   • (E) Give reasons for the following :—
   • (a) Colour of lanthanide complexes is not appreciably affected by the nature. 3 of the ligand
   • (b) Lanthanides preferably exhibit 3+ oxidation state. 2
   • (F) How does uranium occur in nature ? Discuss the extraction of uranium 5 pitchblende by solvent extraction method
4. Q4 Attempt any three of the following :—
   • (A) What are supercritical liquids ? Explain with phase diagrams for 5
   • (B) With reference to liquid ammonia as the solvent, explain the following with 5
   • (C) (a) Explain, among the halogens iodine only forms hepta fluoride. 2
   • (b) Write note on preparation of interhalogen compounds. 3
   • (D) What are Pseudohalogens ? Discuss the differences between pseudohalogens 5
   • (E) Discuss any one method of preparation, two properties and bonding of 5
   • (F) (a) Explain ammonia is. ‘water like’ solvent. 2
   • (b) Explain with equation cannot be stored in glass vessels. 3
5. Q5 Answer the following
   • (A) Select and write the appropriate answer.— 4 Trans dichloroethylene belongs to point group
   • (i) C (ii) C5, (iii)
   • (b) The angle of rotation for a C3 axis is
   • (i) (ii) (iii)
   • (c) The structure of ion is
   • (d) The p-type semiconductor is obtained when Si is doped with
   • (i) As (ii) Sb (iii) Al
   • (A) State whether the following statements are true or false :— 4
   • (p) Photoelectron spectrum of water shows three bands
   • (q) Though BeH, and H,0 molecules have same number of peripheral atoms their structures are different
   • (r) Identity is a doing nothing operation
   • (s) The collection of very closely spaced energy levels is called energy band
   • (B) write the qppropriate answer :— 4
   • (a) ABC . closest packing of atoms result in lattice
   • (b) A point in crystal lattice signifies of particles
   • (i) size (ii) volume (iii) position of centre
   • (c) Frenkel defect occurs in ionic crystals with radius ratio
   • (i) low (ii) high (iii) almost equal to 1
   • (d) The effect of ejecting out the flux lines of magnetic field is known as
   • (B) State whether the following statements are true or false :— 4
   • (p) Void spaces in body centered cubic unit cell is 32%
   • (q) Nearest neighbour distance in hexagonal close packed structure =2r
   • (r) Frenkel defects do not affect the density of the ionic crystal
   • (s) Conventional superconductors require liquid nitrogen for cooling
   • (C) Select and write the appropriate answer :— 4
   • (a) The electronic configuration of Yb2* is
   • (i) (ii) (iii)
   • (b) The lanthanide ions which are diamagnetic are
   • (i) and — (ii) La and Ce2+ (iii) La and Lu
   • (c) The lanthanide ion that is colourless is
   • (d) Uranium 235 is used as
   • (i) Nuclear fuel (ii) Utensils (iii) both (i) and (ii)
   • (C) State whether the following statements are true or false :— 4
   • (p) Compared to actinides, lanthanides show weaker tendency to form
   • (q) Uranium is the starting material for the synthesis of transuranic elements
   • (r) Most of the tripositive lanthanide ions are characterized by well defined
   • (s) Freshly prepared uranium is a bright, white lustrous metal which becomes brown on standing
   • (D) Select and write the appropriate answer :— 3
   • (a). Among the following which is an aprotic solvent
   • (c) Among the following which is not a pseudohalide
   • (i) (ii) (iii)
   • (D) whether the following statements are true or false :— 3
   • (p) The anions of pseudohalogens are called as pseudohalides
   • (q) The bond strength of the interhalogens increases as the electronegativity difference between the halogens increases
   • (r) Noble gases were also named as rare gases

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