BSc Sem V 2015 2016 2016 Chemisty 3 Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q2 Answer any three of the following : Explain the structure of NaCl 5 Name the types in which crystalline solids are classified on the 5 of bonding. Expiain any one of them
   • (C) Write short on ‘octahedral voids’. 5
   • (D) Explain the terms : 5
   • (E) Givea brief account of organic super conductor. 5
   • (F) atomic packing fraction. Show that void space in bec unit 5
   • Q.P. Code : 12775
2. Q3 Attempt any three of the following :
   • (A) Give an account of absorption spectra of Lanthanons. 5
   • (B) Write a note on 'commercial and nuclear of lanthanons. 5
   • (C) Write the observed and expected electronic configurations of 5
   • (D) Compare the magnetic properties of d-block and 5
   • (E) (a) Explain why is selected as a suitable solvent for the 5 separation of individual lanthanons
   • (b) Explain the basicity of Lanthanon hydroxide:
   • (F) Give three physical properties and two chemical properties of 5
3. Q4 Answer any three of the following :
   • (A) Define Hydration energy. Explain the equations used in the 5 calculation of hydration energy for cations and anions
   • (B) What are predominance diagrarns ? Explain the predominance diagrams for (a) Weakly basic anions (b) Strongly basic anions
   • (C) on cations’. Explain how charge andradius affect the acidity of oxocations ?
   • (D) Explain (1) acidic (ii) basi: (ili) amphiprotic solvents with suitable 5
   • (E) the properties of the solutions of alkali metals in liquid 5
   • (F) Justify the following statements
   • (a) with high dielectric constant are better solvents 3 for ionic compounds
   • (b) Dipole moment of acetic acid is zero. 2
4. Q5 Answer the ;
   • (A) Seiect and write the most appropriate answer
   • (a) The angle of rotation for a 1S
   • (ii) (iii)
   • Q.P. Code: 12775 oe operation that leaves the molecule unchanged is
   • (i) Centre of gravity (ii) Symmetry (iii) Identity
   • (c) According to symmetry rules label 'e' denotes
   • (d) Structure of 10M IS
   • (A) State whether the following statements are true or false. 4
   • (p) Walsh diagrams show the change in energy of molecular orbitals with variation in bond length of the molecule
   • (q) Though BeH, and H,O have same number of peripheral atoms their structures are different
   • (r) Trans dichloro ethylene has point-group
   • (s) A plane which bisects the angle formed between two similar consecutive C, axes is called dihedral plane
   • (B) Select and write the most appropriate answer. 4
   • (a) Radius of 70 pm while that of anion is 185 pm
   • (i) 0.520 Gil)
   • (b) Platinum in fee crystal. It's radius is 139pm Edge length of unit cell will be
   • (c) Carbon atoms in fullerene are . hybridised
   • (d) The compound with coordination number 4 remains stable if its radius ratio value is between
   • (iii) 0.732 — 1.00
   • (B) State whether the following statements are true or false. 4
   • (p) Void space in unit cell is 26% It is primitive cell
   • (q) Nearest neighbour distance in hep unit cell is a = 2r
   • (r) Low temperature superconductors are those whose critical temperature is below 77K
   • (s) an example of ionic solid

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