Download SGBAU (Sant Gadge Baba Amravati university) BSc 2019 Summer (Bachelor of Science) 2nd Sem Chemistry Previous Question Paper
B.Sc. (Part?I) Semestcr?II Examination
CHEMISTRY
Time : Three Hours] [Maximum Marks : 80
Note :? (1)
(2)
(3)
(4)
1. (A) Fill
(i)
(ii)
(iii)
(iv)
All questions are compulsory.
Question No. l carries 8 marks, while each of the remaining six questions carries
12 marks.
Draw diagram and write equations wherever necessary.
Use of scienti?c calculator is allowed.
in the blanks :
The total number of atoms or molecules whose concentration determines the rate
of a reaction is called as
The type of hybridization in ClF1 molecule is
The unit of rate constant for a second order reaction is
In chlorobenzcne. chlorine atom is bonded to _ hybridized carbon atom of
the benzene ring. 2
(B) Choose the correct alternative :
(i)
(ii)
The outer shell electronic con?guration of 17'" (VII A) group elements is :
(21) us2 up3 (b) nsl npl
(c) ns2 np5 (d) ns2 np2
Dihydric alcohols are known as :
(a) diols (b) trio]
(c) geraniols (d) none of the above
(iii) The shape of PC15 molecule is :
(a) V shape (b) Trigonal bipyranidal
(c) T shape ((1) Tetrahedral
(iv) The dipole moment of C01 molecules is :
(a) We (b) zero
(c) "we and ?vc (d) none of these V2><4z2
YBC?15232
l (C ontd.)
(C) Answer in one sentence each
(i) What is pseudo unimolecular reaction ??
(ii) What are cpoxidcs ?.?
(iii) What are non polar solvents '?
(iv) What is the lUl?AC name of(?H;?(?Hf(VTHI-O?CHz?CH; ? lx4=4
UNlT?l
2. (A) Explain I.UX-Flood concept or? acid and base with suitable example. 4
(B) What is Polarization ? Explain the Polarization of the anion by the cation. 4
(C) What is SIIAB Principle ?.? [low is it useful to predict the stability of complex ? 4
()R
3. (P) Discuss the structure of IF, molecule. 4
(Q) How charge and size 0t~ 2. cation affects Polarisation of anion 7 Explain. 4
(R) Explain :
(i) CaCl2 is readily soluble hut AgCl is sparingly soluble in water. 2
(ii) Melting point of Ca(?l2 is higher than that of BaClz. 2
UNIT?ll
4. (A) Write the electronic con?guration of oxygen l?amily elements. 4
(B) Explain the structure ol'XcO? molecule. 4
(C) How are solvents claSSi?ixl on the basis of proton donating and accepting ability ?.?
4
0R
5. (P) Discuss structure and bonding in [F3 molecule. 4
(Q) Explain the structure of )(cF6 molecule 4
(R) Write any two reactions cf liquid ammonia. 4
UNlT?lll
6. (A) How will you prepare Bcnzyl chloride from :
(i) Toluene
(ii) Bcnzyl alcohol ?.? 4
(B) How will you prepare :
(i) Ethylene glycol from ethylene ?
(ii) Trinitro glycerol from glycerol 1? 4
(C) How will you obtain glycerol form propcnc by chlorination ? 4
0R
YBC?l 5232
[J
(Could)
7. (P) Explain the mechanism of Pinacol-Pinacolone rearrangement. 4
(Q) Compare the reactivity of chlorobenzene and benzyl chloride towards the nucleophilic
substitution reaction. 4
(R) What happens when :
(i) Allyl chloride reacts with Aq. KOH ?
(ii) Acetylene gas passed through dil HCl at 433K in presence of HgZCl2 ? 4
UNIT?IV
8. (A) Give the following reaction of Phenol :
(i) Kolbe?s Reaction
(ii) Fries Rearrangement. 4
(B) Explain the ring opening reaction calatysed by acid. 4
(C) What is action of cold and hot HI on diethyl ether ?? ' 4
OR
9. (P) What are Phenols ? How Phenol is prepared from cumene ? 4
(Q) Complete the following :
'(i) CIIZ=CH2+ R??OOII _A, '2
(ii) CHs?CHz?Br + CH3~CH2?0Na _A_, ? 4
(R) How will you prepare :
(i) Dicthyl ether from ethyl alcohol
(ii) Styrene oxide from styrene ? 4
UNIT?V
10. (A) What are paramagnetic substance ? Give their characteristics. 4
(B) Calculate number of unpaired electrons when magnetic moment is 4.9 BM. 4
(C) Discuss any two applications of dipole moment. 4
OR
11. (P) Describe the refraction method for the determination of dipole moment. 4
(Q) Discuss Gouy's balance method for determination of molar magnetic susceptibility. 4
(R) If the magnetic substance contains three unpaired electrons, calculate its magnetic
moment. 4
YBC?15232 3 (C0ntd.j
UNIT?VI
12. (A) De?ne :
13.
YBC
(B)
(C)
(P)
(Q)
(R)
[J
(i) Psuedo Firs! Urdu Relction
(ii) Molecularil}. 4
De?ne zero order reamion uul give one example. What is the unit 01' zero order rate
constant ? 4
Describe the graphical method for detemmation 01? order of reaction. 4
OR
Describe Van?t Hoft?s cliffcrsmial mcthud for the dctcrminalion of order of reaction.
4
De?ne :
(i) Order of reaction
(ii) Activation energy. 4
For a given reaction al 351' ? rats constant doublcs when tempcraturc is increascd by
10?C calculate the energy 01' activation for this reaction.
Given : [R = 8.3?4Jk lmol '|. 4
12 4 625
This post was last modified on 10 February 2020