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B.Sc. (Part—III) Semester—V Examination
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CHEMISTRYTime : Three Hours] [Maximum Marks : 80
Note :— (1) Question No. 1 is compulsory.
(2) Solve ONE question from each unit.
(3) Draw diagrams and give equations wherever necessary.
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(4) Use of calculator is allowed.- (a) Fill in the blanks :
- The ligand that has four donor atoms for bonding is called __________
- Pyridine is __________ membered heterocyclic compound.
- A chromogen without __________ can never act as a dye.
- The reactions taking place in presence of light are called __________ reactions. 2
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- (b) Select the correct alternative :
- Which of the following complex ion has highest crystal field splitting A value :
(a) [Co(H2O)6]³? (b) [Ni(H2O)6]²?
(c) [Rh(NH3)6]³? (d) [Ir(NH3)6]³? - Tea tree oil can be used as :
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(a) Insecticide (b) Herbicide
(c) Fungicide (d) Rodenticide - Photosynthesis of carbohydrates in plants from CO2 and H2O is example of :
(a) Fluorescence (b) Phosphorescence
(c) Photosensitized reactions (d) Dark reaction - Which of the following molecule shows highest force constant ?
(a) C=C (b) C-C
(c) C=C (d) C-H
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- Which of the following complex ion has highest crystal field splitting A value :
- (c) Answer in one sentence each :
- What is coordination number ?
- What is Laporte orbital selection rule ?
- What is Chichibabin reaction ?
- Define quantum yield. 4
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- (a) Discuss geometrical isomerism exhibited by [Ma2b2] and [M(AA)2b2] complexes. 4
(b) Discuss optical isomerism exhibited by [Mabcd] and [M(AA)3] complexes. 4
(c) Explain the following terms with suitable examples :
(i) Effective atomic number
(ii) Ligand. 4--- Content provided by FirstRanker.com ---
OR - (p) Discuss Sidgwick’s electronics interpretation of co-ordination complexes. 4
(q) Calculate EAN in the following
(i) [Fe(CN)6]4?
(ii) [Cr(NH3)6]³?. 4--- Content provided by FirstRanker.com ---
(r) On the basis of VBT discuss structure of [Co(NH3)6]³?. 4
UNIT—II
- (a) Write different postulates of crystal field theory. 4
(b) Explain Russell-Saunders (L-S) Coupling Scheme. 4
(c) Calculate CFSE for [Cr(H2O)6]²? High Spin Complex if ?0 = 13900 cm?¹ and P = 23500 cm?¹. 4--- Content provided by FirstRanker.com ---
OR - (p) Explain crystal field splitting of d orbitals in octahedral complexes. 4
(q) Discuss Orgel diagram for d¹ and d? Octahedral complexes. 4
(r) Write different types of absorption spectra. 4
UNIT—III
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- (a) Write method of synthesis of pyrrole from :
(i) Succinimide
(ii) Furan. 4
(b) Discuss orientation of nucleophilic substitution in Pyridine. 4
(c) How will you prepare Ethane and 1-Butene from methyl magnesium bromide. 4--- Content provided by FirstRanker.com ---
OR - (p) Describe acidic and basic nature of pyrrole. 4
(q) Write synthesis of methyl lithium and how it reacts with (i) water (ii) formaldehyde. 4
(r) How will you convert pyridine to the following :
(i) 3-nitropyridine--- Content provided by FirstRanker.com ---
(ii) Pyridine 3-sulphonic acid ? 4
- (a) Give preparation and uses of methyl orange. 4
(b) Describe synthesis and uses of phenylbutazone. 4
(c) Give method of preparation of Thiram. 4--- Content provided by FirstRanker.com ---
OR - (p) Give the classification of dyes on the basis of their mode of application. 4
(q) Write synthesis and uses of chloroquine. 4
(r) Give method of synthesis of Malathion and its uses. 4
UNIT—V
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- (a) Give statement of Lambert’s law and derive its equation. 4
(b) Explain phenomena of fluorescence and phosphorescence with the help of Jablonski diagram. 4
(c) A substance when dissolved in water at 10?4 M concentration absorbs 10% of an incident radiation in a path of 1 cm length. What should be the concentration of the solution in order to absorb 90% of the same incident radiation ? 4
OR - (p) Explain kinetics of photochemical decomposition of HI. 4
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(q) Write difference between thermal and photochemical reactions. 4
(r) Light of intensity 3.2 x 10?6 einstein/sec falls on the surface of a crystal whose absorption coefficient is 3 x 104 cm?¹ at the certain wavelength of light. Calculate the intensity of light at a depth of 100Å below the surface of the crystal. 4
UNIT—VI
- (a) Explain energy level diagram for a simple harmonic oscillator. 4
(b) Explain rotational Raman spectrum of diatomic molecule. 4--- Content provided by FirstRanker.com ---
(c) The pure rotational spectrum of gaseous HCl contains a series of equally spaced lines separated by 20.80 cm?¹. Calculate the internuclear distance of the molecule. The atomic masses of H and Cl are 1.673 x 10?²7 kg and 58.06 x 10?²7 kg respectively. (h = 6.626 x 10?³4 JS). 4
OR - (p) What is electromagnetic radiation ? Give its different parameters. 4
(q) Derive an expression for moment of inertia of diatomic molecule. 4
(r) Calculate rotational and vibrational degree of freedom for CO2 and H2O. 4
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This download link is referred from the post: SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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