BSc Chemistry SEM IV 2018 19 Apr 2018-19 CHEMISTRY PAPER I Question Paper - Mumbai University | munotes

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1. Q3 Use of log-table/nonprogrammable calculator is allowed
2. Q4 Answers for the same question as far as possible should be written together
3. Q1 Select the correct option and complete the following sentences. (any twelve) 12 marks
   • (1) In Galvanic cell, any electrical work done is on the expense of
   • a) increase in free energy b) decrease in free energy decrease in In an electrochemical cell, the reduction reaction always takes place at the electrode which is at potential
   • (iii) Quinhydrone is a mixture of
   • (a) quinine and hydroquinone (b) quinone and hydroquinone equimolar mixture of quinone and hydroquinone
   • (iv) The least number of variable factors required to specify the mixture of gases are
   • (v) Clapeyron equation can be used to study the effect of pressure on
   • (a) melting points of solids (b) boiling points of liquids (c) melting points of solids and boiling points of liquids
   • (vi) The eutectic point of two component system is
   • (vii) ions form color precipitate on addition of lead acetate and acetic
   • (viii) Coordination no. of Fe in K3 [ Fe is
   • (ix) The number of unpaired electrons in is are
   • (x) among the following is used as a catalyst in the manufacture of
   • (xi) among the following is ferromagnetic in nature According to IUPAC nomenclature, the name of the positively charged ligands end with the suffix
   • a) ‘ate’ b) ‘ium’ Reaction of phenyl magnesium bromide with dry ice followed by acid hydrolysis
   • (xiv) Salicylic acid on heating strongly with soda lime gives
   • (xv) The weakest acid among the following
   • (xvii) Coversion of diester having a-hydrogen atom into cyclic B-keto ester on heating with base is known as Acetic acid when heated with P,Os gives
   • (B) State whether the following statements are true or false. (any three) 03
   • (i) Valency of an ion can be determined by measuring an emf of an electrolyte In phase diagram of one component system, along the curves, the system is bi Oxalate ion is a chelating ligand
   • (iv) Diamagnetic substances are attracted towards the magnetic field
   • (v) An intermediate formed in nucleophilic acyl substitution have tetrahedral structure
   • (vi) Formic acid is weaker acid than acetic acid
   • (C) Match the column. (any five) 05
   • (i) Invariant system (a) Ore of scandium Salt bridge (b) Ore of Titanium
   • (iii) Patronite (c) Degrees of freedom
   • (v) HVZ reaction (e) Ore of Manganese
   • (vi) Sulfonation of benzene (f) F=0
   • (g) Ore of vanadium
   • (k) To minimize liquid junction potential
4. Q2 Attempt any four of the following
   • (A) Explain - any two applications of Electrochemical series. 05
   • (B) Derive Nernst equation for determination of emf of a galvanic cell. 05
   • (C) The basic reaction which takes place in cell is - 05 The emf of a cell is 1.018V at 298K. Its temperature coefficient at constant pressure is (-3-9) x Calculate AG, AS and AH for the given cell reaction of Weston Cell
   • (D) State and explain the phase rule and the terms involved in it. 05
   • (E) Define congruent melting point. Explain it with labelled diagram for sodium —potassium 05
   • (F) Ether boils at 306K at 1.00 x Pa pressure. At what temperature will it boil at a pressure of 05 9.85 x Pa? Given that the molar enthalpy of vaporization of ether is 2.74 x 10* J mol’
5. Q3 Attempt any four of the following
   • (A) i) Give the characteristic properties of transition elements. 03 Write the tests by which presence of iron can be detected in the given salt. 02
   • (B) i) Name the first five elements of 3d series of transition elements and give their electronic 05 Give an account of the special stability of and configurations with reference to
   • (C) i) Explain the isomerism exhibited by [Co complex. 05 1i) What is hydrate isomerism? Explain with a suitable example
   • (D) Account for the following: 05
6. Q1 Manetic moment of transition elements is determined by using spin only formula
   • ii) Lanthanum though is a d block element , is always considered as a member of f block
   • (E) Comment on the following statements. 05
7. Q1 Colour of transition metal compounds can be explained on the basis of d-d transition of electrons li) Cu** salts are coloured but Zn** salts are colourless
   • (F) What are inner orbital and outer orbital complexes? Explain the same with the help of 05 [Fe and [Fe Comment on their magnetic property
8. Q4 Attempt any four of the following
   • (A) i) How will you prepare benzoic acid from 03 What is the action of following reagents on benzene sulfonic acid 02
   • (B) What is nucleophilic acyl substitution? How will you convert an amide into carboxylic acid? 05 Give its mechanism
   • (C) 1) What is aryl sulfonation? Give one example. What are different sulfonating agents? 03
9. Q11 How picric acid is prepared from phenol via sulfonation and Ipso substitution? 2 marks
   • (D) Explain Hell-Volhard-Zelinskii reaction with mechanism. 05
   • (E) What happens when 05
   • a)Ethyl benzoate is heated with ammonia
   • b) Naphthalene is heated with at
   • c)Acetic acid is heated with PCls
   • d) Benzoyl chloride is heated with excess of ammonia
   • e) Benzoic acid is treated with followed by acid hydrolysis
10. Q1 base, 2. H Name the reaction and give its mechanism
11. Q5 Attempt any four of the following
    • (A) Explain the origin of liquid junction potential and show how it can be minimized. 05
    • (B) Give a brief account of meta-stable equilibrium in sulphur system. 05
    • (C) i) Name the different oxides of vanadium. Mention the oxidation state of vanadium 05 in each of them
    • ii) Explain the role of salts in titrimetric analysis
    • (D) Distinguish between - 05 double salt and complex compound
    • (E) What is Claisen condensation? Explain its mechanism with suitable example. 05
    • (F) i) Explain why sulphonic acids are stronger than carboxylic acids. 03
    • ii) What is desulfonation? Explain with suitable example. 02

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