Exam Details
| Subject | ||
| Paper | ||
| Exam / Course | mains | |
| Department | ||
| Organization | Haryana Public Service Commission | |
| Position | chemistry | |
| Exam Date | 2003 | |
| City, State | haryana, |
Question Paper
1. Write critical notes on any four of the following
Explain bonding in [Fe [Co using valence bond approach.
Imperfections in crystals.
Application of second law of thermodynamics in relation to the entropy changes in an ideal gas.
Mechanism of Reimer-Tiemann reaction.
(e)Factors which stabilise carbanions and the methods of generation of carbanions.
Chemical shift and coupling constant.
2. Write the electronic configuration of 0 2-and molecular orbital representation of Her.
(b)Draw the d-orbital splitting pattern for a trallsition metal ion "in a tetrahedral complex.
(c)Write the reduction of KMnO4 in acidic, neutral and alkaline media and also detennine the ratio of changes in the oxidation state of Mn in these three media.
3. Half-life period of a chemical reaction is 50 minutes. The half-life period of the reaction is doubled on doubling the concentration of the reactant. Calculate the order of the reaction.
Calculate the molecular translational partition function for 1 mole of nitrogen gas at 27°C and 1 atm assuming the gas to behave ideally (given, h 6-625 x 10-27 erg sec and k 1·38 x 10-16 erg deg-I).
Derive the following expression for the change in entropy of an ideal
Explain reasons for high and low
quantum yield reactions.
4. EMF ofthe following cell at 25°C is 0-561:
Pt; Fe2 Fe3+ (0·75 II
C fVI AI
f207 Cr H Pt_
Calculate the value of X if EO
0'77V and
1·331:
C-03/M-04
P.T.O.
How will you calculate bOlld order m CO molecule with the help of molecular orbital theory Explain also negligible dipole moment of the molecule with this theory.
Give the resonance structures of
NO} and
Explain the term 'Chemical
Potential' Obtain an expression for
the variation of chemical potential
with temperature.
Part II
5. Explain kinetic and thennodynamic control of products m eliiiililatioil reactions with suitable examples.
Write the stereoelectronic requirements of Beckmann rearrangement. Discuss the mechanism of this reaction with suitable example and describe its synthetic importance.
Draw an orbital picture to account for the Claisen anangement.
C-03/M-04 4
6. Complete the following reactions by
writing the intermediates and final products:
yH3
oo,el"
Aq.Conc.KOH
SOCI,
AnhydrousAlC13
How do the IR spectra of the following
compounds differ
·r
C 6 H s CHO and
C H -CO -CH -CO -CH 6 5 2 3
C-03/M-04 5 P.T.O.
Explain number and weight average molecular weight of poiymers. Describe viscosity measurement method to determine molecular weight of polymer.
7. Describe preparations and properties of polystyrene and teflon.
Explain the following
Singlet and triplet states m electronic spectra.
Woodward-Fieser Rules
Isotope dIeet and its apoliations
Describe the principles of NMR and discuss the applications of HNMR to simple organic molecules.
C-03/M-04 6
Explain bonding in [Fe [Co using valence bond approach.
Imperfections in crystals.
Application of second law of thermodynamics in relation to the entropy changes in an ideal gas.
Mechanism of Reimer-Tiemann reaction.
(e)Factors which stabilise carbanions and the methods of generation of carbanions.
Chemical shift and coupling constant.
2. Write the electronic configuration of 0 2-and molecular orbital representation of Her.
(b)Draw the d-orbital splitting pattern for a trallsition metal ion "in a tetrahedral complex.
(c)Write the reduction of KMnO4 in acidic, neutral and alkaline media and also detennine the ratio of changes in the oxidation state of Mn in these three media.
3. Half-life period of a chemical reaction is 50 minutes. The half-life period of the reaction is doubled on doubling the concentration of the reactant. Calculate the order of the reaction.
Calculate the molecular translational partition function for 1 mole of nitrogen gas at 27°C and 1 atm assuming the gas to behave ideally (given, h 6-625 x 10-27 erg sec and k 1·38 x 10-16 erg deg-I).
Derive the following expression for the change in entropy of an ideal
Explain reasons for high and low
quantum yield reactions.
4. EMF ofthe following cell at 25°C is 0-561:
Pt; Fe2 Fe3+ (0·75 II
C fVI AI
f207 Cr H Pt_
Calculate the value of X if EO
0'77V and
1·331:
C-03/M-04
P.T.O.
How will you calculate bOlld order m CO molecule with the help of molecular orbital theory Explain also negligible dipole moment of the molecule with this theory.
Give the resonance structures of
NO} and
Explain the term 'Chemical
Potential' Obtain an expression for
the variation of chemical potential
with temperature.
Part II
5. Explain kinetic and thennodynamic control of products m eliiiililatioil reactions with suitable examples.
Write the stereoelectronic requirements of Beckmann rearrangement. Discuss the mechanism of this reaction with suitable example and describe its synthetic importance.
Draw an orbital picture to account for the Claisen anangement.
C-03/M-04 4
6. Complete the following reactions by
writing the intermediates and final products:
yH3
oo,el"
Aq.Conc.KOH
SOCI,
AnhydrousAlC13
How do the IR spectra of the following
compounds differ
·r
C 6 H s CHO and
C H -CO -CH -CO -CH 6 5 2 3
C-03/M-04 5 P.T.O.
Explain number and weight average molecular weight of poiymers. Describe viscosity measurement method to determine molecular weight of polymer.
7. Describe preparations and properties of polystyrene and teflon.
Explain the following
Singlet and triplet states m electronic spectra.
Woodward-Fieser Rules
Isotope dIeet and its apoliations
Describe the principles of NMR and discuss the applications of HNMR to simple organic molecules.
C-03/M-04 6