I CHE-01/021
No. of Printed Pages : 19
B.Sc. Examination
June, 2016
CHE-01 : ATOMS AND MOLECULES
AND
CHE-02 : INORGANIC CHEMISTRY
07559
Instructions :
(i) Students registered for both CHE-01 and CHE-02
courses should answer both the question papers in two
separate answer books entering their enrolment
number, course code and course title clearly on both
the answer books.
(ii) Students who have registered for CHE-01 or CHE-02
should answer the relevant question paper after
entering their enrolment number, course code and
course title on the answer book.
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CHE-01/02
1
P.T.O.
CHE 01 I
-
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
June, 2016
CHEMISTRY
CHE-01 : ATOMS AND MOLECULES
Time : 1 hour
Maximum Marks : 25
Note : Answer all the five questions.
Use the following data wherever required :
Planck's constant, h = 6.626 x 10-34 Js
Velocity of light, c = 2.998 x 108 ms-1
Mass of electron, m = 9.109 x 10 41 kg
1. Answer any two parts of the following :
(a) Ni (28) has electronic configuration :
is2 2s2 2p 6 3s2 3p6 3d8 4s2
but Cu (29) has electronic configuration :
s
1s2 2s2 2p6 3s2 3p6 3d 10 4s1
Why is it so ?
(b) The radius of the first orbit of hydrogen
atom is 53 pm. What would the radius of the
third orbit be ?
(c) Will the following molecules absorb in the
microwave region ?
.
SO2, N2
CHE-01
2
2
4
2. Answer any two parts of the following :
(a) Draw a plot of w and w 2 for n = 2 state of a
particle in a one-dimensional box.
(b) An organic compound has k mai, = 480 nm.
solution
its
of
absorbance
The
(c = 132 mg cm-3 ) was found to be 0-560.
If an unknown solution of this compound
gave an absorbance of 0.750, calculate its
concentration.
(Do not change the concentration unit.)
(c) For SF6 molecule, give the following :
(i)
Hybridisation of S atom
(ii) Shape of SF6 molecule
3. Answer any two parts of the following :
(a) What is meant by the half life period of a
14 / 12
radioactive nuclide ? The 6 C/ 6 C ratio in
a deeply buried fossil is only 0.25 times that
in a living plant. How old is the fossil ?
(tv2 for 1:C = 5720 years)
CHE-01
3
P.T.O.
(b) On the basis of VSEPR theory predict the
shape of any one of the following :
2-
(i)
CO
(ii)
XeF2
(c) Calculate the frequency of the radiation
required to eject photoelectrons at a velocity
of 9 x 105 ms-1 from sodium metal surface,
having a threshold frequency of
4.61 x 10 14 Hz.
4. Answer any two parts of the following :
(a)
8
(i) State the selection rules for a harmonic
vibration transition and for an
anharmonic vibration transition.
(ii) Calculate the normal modes of
vibration for any two of the following
molecules :
CO2, SO2 and CHC13
(b)
Predict the shapes of BF 3 and NH3
molecusnthbaifVSEPReory.
Will the dipole moment values of the two be
different ? Justify your answer.
(c)
Calculate the % ionic character in HC1
molecule for which the observed dipole
moment is 3.57 x 10 -30 Cm and the bond
length is 127.5 pm.
CHE-01
4
5. Answer any one part of the following :
(a) On the basis of molecular orbital theory,
with respect to
compare 02 , Oi and
their bond order and magnetic behaviour.
5
(b) (i) Draw the molecular orbital energy level
diagram for NO molecule.
(ii) On the basis of the above, calculate the
bond order and predict the magnetic
behaviour of NO molecule.
CHE-01
5
P.T.O.
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CHE-01
6
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CHE-01
tU2 = 5720 '44)
7
P.T.O.
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CHE-01
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9
P.T.O.
CHE-02
BACHELOR OF SCIENCE (B.Sc.)
Term-End Examination
June, 2016
CHEMISTRY
CHE-02 : INORGANIC CHEMISTRY
Time : 2 hours
Maximum Marks : 50
Note :
(i)
Answer all the five questions.
(ii) All questions carry equal marks.
1. Answer any ten of the following :
10x1..10
(i)
Write the electronic configuration of the
atom whose atomic number is 24.
(ii)
Arrange H, H and 11 - in the order of
increasing atomic radius.
(iii) Which one of Be and B has higher first
ionisation energy ?
(iv)
CHE-02
Which one of K+ and Ca2+ is a poor
complexing agent ?
10
(v) Which one of LiA1H4 and NaBH4 is a more
selective reducing agent ?
(vi) Which one of Li + and ce has a higher ionic
conductance in aqueous solution ?
(vii) Which one of the following is a covalent
hydride ?
SiH4, Ti114 and CaH2
(viii)Which one of N20 and N205 is acidic in
nature ?
(ix) Which one is more stable, Cr 2+ or Cr3+
(x) Give the shape of [SiF eJ2- ion.
(xi) Write the formula of hexaamminecobalt(III)
chloride.
(xii) Name the most electronegative element in
the periodic table.
(xiii)Which one of Ti3+ and Ti4+ will produce a
coloured solution in water ?
(xiv) Which one of CaO and ZnO is amphoteric in
nature ?
2. Answer any five of the following :
5x2=10
(a) Explain the difference in the type of
hydrogen bonding in ortho-nitrophenol and
para-nitrophenol.
(b) Lithium carbonate is thermally unstable
whereas other alkali metal carbonates are
thermally stable. Explain.
11
P.T.O.
CH E-02
(c)
Why are the inter-halogen compounds more
reactive than the halogens ?
(d)
Explain why the chemical properties of
isomers of hydrogen are similar.
(e)
Why do alkali metals in liquid ammonia act
as strong reducing agents ?
(f)
Why cannot boron expand its coordination
number beyond four ?
(g)
Alkaline nature of hydroxides of Group 1
elements increases as we go down the group.
Explain.
3. (a) Answer any three of the following :
3x2=6
(i)
Why is SO3 not dissolved in water
directly during the preparation of
sulphuric acid ?
(ii)
Why cannot CC14 be hydrolysed
whereas SiC14 can be hydrolysed
easily ?
(iii) SiO2 is a solid whereas CO2 is a gas at
room temperature. Explain.
(iv) Why does NH3 act as a Lewis base ?
(v)
CHE-02
PbBr4 and PbI4 do not exist. Explain.
12
(b) Complete any four of the following chemical
• equations :
4x1=4
(i)
3 B2H6+ 6 NH3
(ii)
NH4C1 + NaNH2
475 K
(iii) NC1 3 + 3 H2O
(iv) 1 2 + 1F3 -->
(v)
SnC12 + 2 FeC1 3
(vi)
CI 2 + H 2 S -->
(a) Amongst NH3, PH3, AsH3, SbH3 and
BiH3
4x1=4
(i) which one is thermally least stable ?
(ii) which one has the highest melting
point ?
(iii) which one is the most basic ?
(iv) which one has the smallest bond
angle ?
(b) Answer any two of the following :
2x3=6
(i) Discuss the nature of bonding in
diborane.
(ii) Explain the structure and magnetic
behaviour of [NiC14] 2- on the basis of
Valence Bond theory. (Atomic number
of Ni is 28)
(iii) Name the peroxo acids of sulphur. How
• will you differentiate between them ?
CHE-02
13
P.T.O.
5.
Answer any five of the following :
5x2=10
(a) Why are zinc and cadmium soft metals ?
(b) Write the structures of geometrical isomers
of [Co(NH3)4 C12] +.
(c)
Give the reasons for the late discovery of
noble gases.
(d) Write the chemical equations for the
reduction of TiC14 to Ti by Kroll's process.
(e) What are inner transition elements ?
(f)
What are transition elements ? Why are they
so called ?
(g) As compared to the lanthanide ions, the
actinide ions have a greater tendency to
form complexes. Explain.
CHE-02
14
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CHE-02
15
P.T.O.
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17
P.T.O.
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CHE-02
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CHE-02
19
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