Exam Details
| Subject | chemistry | |
| Paper | paper 1 | |
| Exam / Course | indian forest service | |
| Department | ||
| Organization | union public service commission | |
| Position | ||
| Exam Date | 2001 | |
| City, State | central government, |
Question Paper
I fFS-1001 l ol 7
PAPER-I
SECTION A
I.AUcmpl any four of the following:
(a)Calculate the average and root-mean-square speeds of N2 at 500°C.
(b)Define Boyle temperature. What is its significance? Estimate the Boyle temperature of N2
from van der Waals constants:
Given: a=l.39 dm6 atm
6=0.039 dm3
R=0.082 dm3, atm,K universe
One mole of an ideal gas With T 273K. V 5 dm3
is expanded into an evacuated container
with V 17dm3. What will be the entropy change 7
(d)Show that the mean ionic activity of Na2SO4 with molality m is <img src='./qimages/1451-1d.jpg'>
(e)The equilibrium constant for the reaction:
2CO(g) is 14.11 at 1123 K and 43.07 at ll73 K. Calculate standard enthalpy
change deltaH of the reaction.
2.(a)the solubility product of Ag Br is 5.3x10-13 mol2.dm-6
Calculate the concentration of Ag+ ions in:
(i)water, and
(ii)0.01 M NaBr
(b)Obtain the following relation for Joule- Thomson-Coefficient
<img src='./qimages/1451-2b.jpg'>
what is its significance
3.(a)Show thatthe entropy of mixing of two ideal gasses at temperature T and pressure P in terms
of mole-fraction is given by:
<img src='./qimages/1451-3a.jpg'>
Whether the process is spontaneous or not, comment
is a phase-diagram What do the lines of such a diagram represent? illustrate,
with the help of a suitable diagram. the triple-point
(ii)Hnw many components are there in an aqueous solution of NaCl And KBr? if to the
solution. KCl and NaBr were added, how many components would he there Give
reasons for your answer.
4.(a)Show that the emf of a concentration cell reversible to anion is given by:
<img src='./qimages/1451-4a.jpg'>
where t is the transport number of cation.
derive the formula for the relaxation time of a reversible first-order reaction:
<img src='./qimages/1451-4b.jpg'>
SECTION 8
5.Attempt any foUr of the following:
(a)Explain band theory is applied to semiconductors. What are extrinsic semi conductors?
(b)Discuss effective atomic number rule as applied to metallic carbonyls. Show that nickel does
not form hexacarbonyl.
(c)give the important postulates of valence bond theory Explain the formation of water
molecule on the basis of the theory.(10)
(d)Explain two factors affecting the rate of substitution reaction in square planar complexes.
Calculate the energy difference between first two energy levels for a particle of mass 1 kg
confined in a one dimensional box of 1 cm length
6.(a)what are cytochromes Explain their two important roles in photosynthesis.(20)
(b)Compare the complex formation reactions and redox reactions occuring in liquid ammonia
and liquid sulphur dioxide.
7.(a)Explain lanthanide contraction, Discuss its cause and consequence on basic character of
oxides.
(b)what are crystal imperfections? Compare Schotty defects and Frenkel defects.
Calculate the atomic packing factor for
(i)Simple cubic system
(ii)Body centred cubic system and
(iii)Face centred cubic system.
Comment on the packing efficiency.
(b)Describe the experimental determination of lattice energy of an ionic solid using Born-Haber cycle.
PAPER-I
SECTION A
I.AUcmpl any four of the following:
(a)Calculate the average and root-mean-square speeds of N2 at 500°C.
(b)Define Boyle temperature. What is its significance? Estimate the Boyle temperature of N2
from van der Waals constants:
Given: a=l.39 dm6 atm
6=0.039 dm3
R=0.082 dm3, atm,K universe
One mole of an ideal gas With T 273K. V 5 dm3
is expanded into an evacuated container
with V 17dm3. What will be the entropy change 7
(d)Show that the mean ionic activity of Na2SO4 with molality m is <img src='./qimages/1451-1d.jpg'>
(e)The equilibrium constant for the reaction:
2CO(g) is 14.11 at 1123 K and 43.07 at ll73 K. Calculate standard enthalpy
change deltaH of the reaction.
2.(a)the solubility product of Ag Br is 5.3x10-13 mol2.dm-6
Calculate the concentration of Ag+ ions in:
(i)water, and
(ii)0.01 M NaBr
(b)Obtain the following relation for Joule- Thomson-Coefficient
<img src='./qimages/1451-2b.jpg'>
what is its significance
3.(a)Show thatthe entropy of mixing of two ideal gasses at temperature T and pressure P in terms
of mole-fraction is given by:
<img src='./qimages/1451-3a.jpg'>
Whether the process is spontaneous or not, comment
is a phase-diagram What do the lines of such a diagram represent? illustrate,
with the help of a suitable diagram. the triple-point
(ii)Hnw many components are there in an aqueous solution of NaCl And KBr? if to the
solution. KCl and NaBr were added, how many components would he there Give
reasons for your answer.
4.(a)Show that the emf of a concentration cell reversible to anion is given by:
<img src='./qimages/1451-4a.jpg'>
where t is the transport number of cation.
derive the formula for the relaxation time of a reversible first-order reaction:
<img src='./qimages/1451-4b.jpg'>
SECTION 8
5.Attempt any foUr of the following:
(a)Explain band theory is applied to semiconductors. What are extrinsic semi conductors?
(b)Discuss effective atomic number rule as applied to metallic carbonyls. Show that nickel does
not form hexacarbonyl.
(c)give the important postulates of valence bond theory Explain the formation of water
molecule on the basis of the theory.(10)
(d)Explain two factors affecting the rate of substitution reaction in square planar complexes.
Calculate the energy difference between first two energy levels for a particle of mass 1 kg
confined in a one dimensional box of 1 cm length
6.(a)what are cytochromes Explain their two important roles in photosynthesis.(20)
(b)Compare the complex formation reactions and redox reactions occuring in liquid ammonia
and liquid sulphur dioxide.
7.(a)Explain lanthanide contraction, Discuss its cause and consequence on basic character of
oxides.
(b)what are crystal imperfections? Compare Schotty defects and Frenkel defects.
Calculate the atomic packing factor for
(i)Simple cubic system
(ii)Body centred cubic system and
(iii)Face centred cubic system.
Comment on the packing efficiency.
(b)Describe the experimental determination of lattice energy of an ionic solid using Born-Haber cycle.