Download chemestry(honours)paper-iii-2005

CHEMESTRY(HONOURS)PAPER-III-2005
Group-A
1. Derive Clausius-Clapeyron equation and mention its applications. The molar heat of fusion
(A) of monoclinic sulphur at 1 atm pressure melting point (119.3 °C) is 422 calmo. The change
in volume during fusion (A) is4Icm3kg-1.
Using the relation i ca!= 41.29 cm3, calculate-the melting point of sulphur at lOOOatm,
2. Define degree of freedom. Draw and explain phase diagram of sulphur system. A lady
weighing 50 kg is standing on ice wearing shoes with sole area of 60 cm2 per shoe. Calculate the
temperature at which the ice with melt under her feet.
3.Explain (a) Index of refraction, (b)Kopp's law and (c) Parachor.
i
Calculate the parachor of acetone if the parachors of C=48, H= 17.1 and0 = 20 and the double
bond = 23.2.
Group-B
4. How transition elements differ from non-transition elements ?. Why (a) most of the transition
metal ions are coloured and (b) first ionization potential transition metals is nearly of the same
order ?
5. Explain Sidgwick's effective atomic number rule. Using EAN rule, predict n molecular
formula of a simple carbonyl of chromium having atomic numb 24 and oxidation state zero.
The EAN of each Mn (25) in M is 36. Suggest the structure M(CO.
6. How lanthanous occur and what are the problems in the separation lanthanons, and in what
ways are they overcome ?
7. Name and mention the electronic configuration of individual members ( actinides. How they
occur and isolated ? Name the actinides having -oxidation states.
,
8. Describe the general characteristics of non-aqueous solvents and discuss different reactions in
liquid S with examples.
9. Write short notes on any three of the following :
(a) Lewis concept of acids and bases
(b) Isomerism in coordination compounds
(c) Spectral properties of second transition element series.
(d) Binary compounds and complexes of elements of first transition series.
(e) Use of redox potential data in the extraction of elements
CHEMESTRY(HONOURS)PAPER-III-2006
Group-A
1. What do you understand by the term AG° ?Calculate AG when hydrogen gas at 0.1 atm
and iodine vapour at 0.1 atm react to form hydrogen iodide at 10 atm at."25°C. AG° = 3.1 Kcals. Comment on your result.
2. State phase rule. Derive the phase rule for the heterogeneous system. Determine the
number of degree of freedom in each of the following system: (a) Liquid water and water
vapour equilibrium (b) Liquid water and water vapour in equilibrium at a pressure of
1atm.
3. What do you mean by dipole moment ? Discuss, how the magnitude of dipole moment
give an idea about the structure of molecules.
. ,
Group – B
4. Discuss the general characteristic properties of transition elements. Explain, why Cu, Ag,
Au, Zn, Cd and Hg are included amongst transition elements.
5. Comment on the general characteristics of second and third transition elements with
respect to their ionic radii, oxidation states and magnetic properties.
6. What are the main points of V. B. Theory with regard to the nature of bond between
metal and ligand incomplexes? On the basis of V. B. Theory, predict the geometry of [
Fe(CN)6 [Fe and [Ni (CO)4.
7. Comment on the ground state electronic configuration of Lanthanide elements.
.
Explain, why + 3 slate is most common and most stable?
7. Discuss, "dielectric constants, dipole moments and auto ionisation playa significant role
in explaining the solubilities of substances in various solvents". Give reason, why
solutions of alkali metals in liquid ammonia are blue in cplour?
8. Write short notes on the following:
9. Lanthanide contraction
10. Werner’s co-ordination theory.
CHEMESTRY(HONOURS)PAPER-III-2007
Group-A
1. (a) Derive the following relationship:
𝑙𝑜𝑔 =
𝑘𝑝2
∆ℎ
1 1
=
( − )
𝑘𝑝1 2.303𝑅 𝑡1 𝑡2
(b) The equilibrium constant (𝑘𝑝 ) for a reaction A (g) + B (g) ↔ C(g)+D(g) at
𝐴 = 𝜋𝑟 2 3270 𝑐 𝑖𝑠 10−12
and at 4270 c is 10−7 .calculate ∆𝐻 of the reaction.
(R = 8.314jk −1 mole−1 )
2. (a) Define Parachor.
(b) How can parachor be used in elucidation of molecular structure V
(c) Calculate the % ionic character in HBr from the following data: Dipole moment
HBr = 2.60 x 1030 coulomb-metre
Bond length of HBr = 141 pm
Charge on an electron = 1.60 x 10−19 coulombs
3. Define or explain the following terms: (a) Phase (b) Component (c) Degree of freedom
(d) Eutectic point (e) triple point
Group-B
4. What are transition elements?
Discuss the general characteristics of 3d block elements with respect to the following:
(a) Electronic configuration (b) Magnetic properties (c)Complex format
(d) Catalytic properties
5. (a) What are Pourbaix diagrams? Explain.
(b) What are Frost diagrams? Explain.
(c) How will you write the Latimer diagram for various oxidation states of iron
found in Fe2+, F𝑒 3+ , Fe𝑜42− and Fe° ?
6. (a) Discuss Lux-Flood concept of acids and bases.
1
(b) What is Bronsted-Lowry concept of acids and bases ? How does this concept differ
from Arrhenius concept of acids and bases?
(c) Arrange the following acids in order of their increasing strength:
𝐶𝐻3 𝐶𝑂𝑂𝐻, 𝐶𝐶𝐼3 . 𝐶𝑂𝑂𝐻, 𝐶𝐹3 . 𝐶𝑂𝑂𝐻, (𝐶𝐻3 )3 𝐶. 𝐶𝑂𝑂𝐻
7. (a)Draw all the isomers of an octahedral complex which has six unidentate ligands, two
of type a and four of type b.
(b)draw all of the isomers of an octahedral complex which has three identical bidentate
ligands of type A-A.
(c) Draw all of the isomerse of a square planar complex which has two unidentate
ligands of type a and two unidentate ligands of type A and two unidentate ligand of type
B.
(d) Write the formula of the following complex:
Diaminedichloroplatinum (ll).
(e) write the proper name of the following compound :
[𝐶𝑜(𝑁𝐻3 )2 (𝑐𝑙)(𝐵𝑟)(𝐶𝐻3 𝐶𝑂𝑂𝐻)]
8. (a)What are non-aquas soplvents and how are they classified?
(b)Describe five different type of reaction that can be carried out in liquid 𝑁𝐻3 .
9. (a)What are actinides?
(b)Write the electronic confriguration of Ac,Th,U,Fm and Lw.
(c) What is actinide contraction?
(d) What are transuranium elements?
(e) Discuss the different oxidation states exhibited in compounds of a actinides.
CHEMESTRY(HONOURS)PAPER-III-2008
Group-A
1.
(a)Derive Clausius-Clapevron equation
(b) Derive Thermodynamicallv the Law of Mass action
2.
(a) Define a congiuent melting t ompound
(b) Draw and explain phase diagram of Zn-Mg system.
(c) What are inconruent melting compounds?
3.
Explain the following
(a) Refiactive index (b) Magnetic susceptibility
(c) Dipole moment and its unit (d) Molecular refractivity
Gioup - B
4. (a)hoe transition elements differ from non-transition elements ?
(b) Why do transition metals compounds are coloured ?
(c)Discuss the paramagnetism and diamagnetism in case
of transition metal compounds.
5. (a) What are the elements of third transition series?
Discribe the various oxidation states exhibited by these
elements.
(b) Discuss, how the radii of atoms and ions of second and third transition series differ
from that of the first transition series.
6. (a) Differentiate between a double salt and a co-ordination
compound.
(b) List the various postulates of wemer's co-ordination theory.
(c) How does the theory account for the ionic nature of the compounds CoCl3 5NH3 and
Cocl3 4NH3 ?
7. (a) Define lanthanide contraction.
(b) What are consequences of lanthanide contraction ?
(c) Explain the various oxidation states of lanthanides with examaples.
8. Discuss the following reactions in liquid sulphur dioxide : (a) Acide-base reactions (b)
Complex formation reactions (c) Precipitation reactions (d) Redox reactions (e) Reactions
with organic compounds
9. Write short on the following :
(a) Lewis concept of acids and bases
(b) Use of redox potential data in the extraction of elements
(c) Valence bond theory