Veer Narmad South Gujarat University 2011-1st Year B.Sc Chemistry (Hons) SB-0606 Chemistry - 1 ( New ) - Question Paper
SB-0606
First Year B. Sc. Examination March / April - 2011 Chemistry : Paper - I (New Course)
Hours] [Total Marks
Time :
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""'N Seat No.:
Name of the Examination :
F.Y. B. Sc.
Name of the Subject:
Chemistry-1 (New)
-Section No. (1,2,.....): NIL
Student's Signature
-Subject Code No.
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Instructions : (1) As per the instruction no. 1 of page no. 1.
(2) Question No. 1 is compulsory.
(3) Give equations and figures wherever necessary.
(4) Figures to the right indicate full marks of the question.
1 Answer the following questions in short and to the point : 15
(i) What are order of reaction and molecularity of reaction?
(ii) State definition and unit of equivalent conductance.
(iii) What is viscosity? Write its units.
(iv) What is entropy? State its unit.
(v) Write formula for obtaining specific refraction.
(vi) Which types of space lattices exist in cubic crystals?
(vii) What are gerade and ungerade?
(viii) What is bond order?
(ix) From amongst alkali metals lithium does not show photoelectric effect. Why?
(x) State the uses of silver nitrate.
(xi) Clathrate compounds of argon, krypton and xenon can be prepared. Why?
(xii) What is crystal field stabilization energy?
(xiii) Give the names of alloys of vanadium.
(xiv) What is mixed fertilizer?
(xv) How can pH of alkaline soil be increased?
2 (a) Explain the effects of temperature and catalyst on 4
the rate of chemical reaction.
(a) Explain : Decay of a radio active element if a first 4 order reaction and obtain formula for half life period.
(b) What is buffer solution? Explain. Derive formula
for calculating the pH of acidic buffer solution. 4
(b) One liter buffer solution contains 0.2 M NH3 and 4 0.2 M NH4C1. Calculate pH of this solution.
(Kb = 1.8 x 10-5, PI = 14)
(c) Write Ostwalds dilution law and its limitations. 3
3 (a) Explain : Parachor and surface tension. Derive an 4
equation to show the relationship between them.
OR
(a) Explain molar refraction. State its uses. 4
(b) Give different statements of second law of thermodynamics and explain that this is a law of dissipation of energy.
(c) Dipole moment of H2S is 0.85 D. If bond angle is 97, 3 calculate dipole-moment of S-H bond.
4 (a) Write a short note on lattice planes and miller indices. 4
(a) How is the crystal structure of sodium chloride 4 studied by X-rays? Explain.
(b) What is VSEPR? In brief explain its principles. 4
(b) Draw the molecular orbital energy level diagram 4 of No molecule. Explain its bond order and magnetic property.
amorphous states.
(ii) Write Braggs equation for x-ray diffraction and what do the terms involved in it show?
5 (a) Explain diagonal relationship of beryllium. 4
OR
(a) Compare atomic radii, ionic radii and ionization 4 energy with respect to S-block elements.
(b) Give properties and uses of silver. 4
OR
(b) Describe cyanide method for the extraction of silver. 4
(c) Explain bonding and structure in Xe03 molecule. 3
6 (a) Explain shapes of d-orbitals. 4
(a) Explain splitting of d-orbitals in square planar 4 complexes using crystal field theory.
(b) Describe any two methods of obtaining vanadium 4 from vanadium pentoxide by reduction.
(b) Describe the extraction of V205 from carnotite-ore. 4
(c) What is ideal fertilizer? Describe different types of 3 classification of fertilizers.
SB-0606] 7 [ 3800 ]
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