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

Questions asked in this paper

1. Q1 Attempt any three of the following
   • (A) By how much would the normal boiling point 353.1 K be 5 1.2g of n-hexane (C,H,,) in 100 g of benzene Ebullioscopic constant of benzene
   • (B) With a neat labelled diagram, explain application of phase rule to 5
   • (C) (i) State and explain the Raoult’s law. 2
   • (ii) graphically the elevation in boiling point of a solvent due to 3 addition of non volatile solute
   • (D) Derive Vant’ Hoff’s equation for osmotic pressure. 5
   • (E) What do you understand by eutectic point ? Explain the phase diagram oflead 5
   • (F) Describe the salient features of a triangular phae diagram for 5
2. Q2 Attempt any three of the following
   • (A) Calculate the ionic strength of the solution containing 0.01 Zn Cl, and 0.2 of FeCl,
   • (B) Derive an expression for the emf of an electrolyte concentration cell without 5 transference reversible to anion
   • (C) Calculate the liquid junction potential of the following cell 5 if the transport number of H*is 0.83 at 298 K
   • Q.P. Code: 12863 how the solubility product of a sparingly soluble saltcanbe determind 5 e any three merits and any two demerits of the glass electrode. 5 What is a salt bridge ? Where is it used ? What are its functions 7 5 When two solutions have same osmotic pressure at a given temperature are said to be isotonic
   • (ii) CaCO, system is a typical example of a one component system
   • (iii) Osmotic pressure of a solution is a colligative property Fill in the blanks with correct alternative. 4 Mathematical expression of Gibb’s phase
   • (ii) When solute particles associate ‘i’ is unity. (equal to, less than, When a non volatile solute is dissolved in a solvent, vapour pressure of the solvent (decreases, increases, remains same)
   • (iv) Sulphur exist in phases. (two, three, four) true or false
   • (a) Quinhydrone contains equimolar amount of quinone and hydroquinone
   • (b) According to Debye Huckal limiting law log y = AZ,’ Ju
   • (c) cell, the emf is due to a chemical reaction occuring within is an example of a concentration cell, Match the following :
   • (b) K,SO, (ii) Explain th following terms giving one example for each 5 point group assigned to water molecule, 5 Explain Importance of molecular symmetry 2 Define ‘Point group’. Explain point group assigned to trans dichloro ethylene, 5 Draw the moleculer orbital diagram for BeH, molecule. Explain its magnetic
   • (F) What is Walsh correlation diagram ? Explain its use in the determination of structure of ion
3. Q5 Answer any three of the following
   • (A) What are the oxoanions ? How are they classified ? 5
   • (B) Give the hydrolysis reactions of Cr’* ions in aqueous medium. 5
   • (C) Write Latimer equation ? Explain its significance. 5
   • (D) What is predominance diagram ? Explain predominance diagram for 5
   • (E) Explain Acidic Basic and Amphiprotic solvents with suitable examples. 5
   • (F) With respect to liquid N,O, as solvent answer the following : 5
   • (ii) Reactions with metals
4. Q6 Answer the following : 4 marks
   • (A) Select and write the most appropriate answer
   • (a) Doing nothing operation is same as
   • (i) centre of symmetry (ii) identity (iii) reflection
   • (b) molecule the principal axis is axis
   • (ii) C, (iii) C,
   • (c) Point group assigned to HCl is
   • (d) Photo electron spectrum of water molecule shows bands
   • Q.P. Code : 12863 ‘A) State whether the following statements are True or False. 4 Water is linear molecule
   • (q) Point group assigned to H, molecule is C,,
   • (t) Order of point group D,, is 6
   • (s) Onthe basis of symmetry symbol ‘t’ denotes triply degenerate orbitals
   • (B) Select and write the most appropriate answer. 3
   • (a) is non ionizing solvent
   • (b) In auto ionization of liquid NH,, species not obtained is
   • (c) number of oxo groups increases basicity increases (ii) decreases (iii) does not change
   • (B) State whether the following statements TRUE or FALSE. 3
   • (p) CCI, is ionizing solvent
   • (q) Liquid CH,COOH exist as dimer
   • (t) Dilute solution of sodium metal in liquid NH, is green in Colour

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