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34 (NS)
9-
(English Version)
lnstructions: i)
The question paper hastourParts.
ii) Part -A carries
All Parts arecompulsory.
10 marks. Each question
carriesone mark.
Part
-
B carries 1 0 marks. Each question carriestwo marks.
Part
-
C carries 15 marks. Each question carries 3 marks.
P a rt
-
D carri es 3 5 m arks. E ach
q u e sti o n
carri e s f ive marks.
iii) Write balanced chemical equations and draw diagrams
wherever necessary.
iv) llse tog tabtes and simple calculator if necessary.
(llse of scientific calculator is not allowed.)
PART
l.
-A
Answerallthequestions. Eachquestion carriesonemark. (Answereachquestion
in oneword
oronesentence.)
(10x1=10)
1) At a given temperature and pressure nitrogen gas is more soluble in water
than Helium gas. Which one of them has higher value of K, ?
2) On mixing equal volumes of acetone and ethanol, what type of deviation from
Raoult's law is expected ?
3) What happens to molar conductivity when one mole of KCI dissolved in one
litre is diluted to five litres ?
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34 (NS)
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4) What happens to the half life period for a first order reaction, if the initial
concentration of the reactants is increased ?
5) Name the process usually employed for the purification of Nickel.
6) ldentify the product'A'
in the following reaction
XeFU+3HrO-+A+6HF
7) How many moles of AgCl will be precipitated when an excess of AgNO.
solution is added to one molar solution of [CrCl (HzO)s] Clz?
8) Name
the organic product formed when chlorobenzene is treated with sodium
in dry ether.
o
o
il
C-u
Name the above reaction.
10) Deficiency of which vitamin causes the disease pernrcious anaemia
PART
ll.
-
?
B
Answer any five of the following. Each question carries two
marks.
(5x2=10)
11) What is meant by the term coordination number in solids ? What is the
coordination number in a face centered cubic close packing structure
?
12) State Faraday's first law of electrolysis. For the electrode reaction
Znz*
+2e- ------+ Ztr1,1,what quantity of electricity in coulombs required to
deposit one mole of zinc.
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34 (NS)
-1 1-
13) A reaction is first order with respect to the reactant A and second order with
respect to the reactant B in a reaction A + B -+ product.
i)
Write the differential rate equation.
ii)
How is the rate of the reaction affected on increasing the concentration of
B by two times ?
14) Give any two differences between lanthanoids and actinoids.
15) Name the product formed when phenol is treated with acidified solution of
NarCrrOr. Give equation.
16) ldentify A and B in the following reaction
:
CHO
,6
+ Conc. NaoH -------) A + B.
17) What is the role of these as food additives
i)
?
Sodium benzoate
ii) Aspartame.
18) Explain saponification of oils/fats with equation.
PART
-C
lll. Answeranyfiveof the following. Each question
carriesthreemarks.
19) Describe the three steps involved in the leaching of bauxite to get pure
Alumina (equations not expected).
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(5x3=15)
-
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34 (NS)
-12-
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20) Write the equations involved in the preparation of nitric acid by Ostwald's
3
process by maintaining the reaction conditions.
21) Complete the following equations
:
a) CHo + 20, -------)
1
b) 2Fe3+ + SOz + zHzO ----+
c) ct2{zzorr conc'.Heso*
1
1
22) a) Which is the strongest acid among the hydrogen halides ? Give one reason
2
[X = F, Cl, Br, I].
b) Write the structure of Chloric acid (HCIO3).
23) Give reason (one each) for the following
1
3
:
a) Transition metals are good catalytic agent.
b) Second ionisation enthalpy of copper
is very high.
c) The spin only magnetic moment of Sc3+ is zero (Z=21).
24) Write the equations involved
in the preparation of Potassium Dichromate from
Chromite ore.
25) With the help of Valence bond theory accountfor hybridisation, geometry and
magnetic property of [Ni(CN)al2-complex ion lZtor
511
= 28].
26) a) Forthe given complex [Co (NHr)5Br]SOo, write the IUPAC name and its
ionisation isomer.
b) Which set of d-orbitals of metal ion/atom experience more repulsion in
octahedral field created by the ligand ?
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34(NS)
-13-
PART-
D
lV. Answer any three of the following. Each question carries
27
five
marks.
(3x5=15)
i a\ Calculate the packing efficiency in a unit cell of Cubic Close Packing (CCP)
structure.
b) Name the crystal defect which
28) a) A solution containing
lowers the density in an ionic
crystal.
1
1Bg of non-volatile non-electrolyte solute is dissolved
in 200 g of water freezes a|272.07K. Calculate the molecular mass of
solute. Given : }(' = 1.86 K kg/mol.
freezing point of water
b)
- 273 K.
Define isotonic solution. What happens when the blood cellis dipped in a
solution containing more than normal saline concentration ?
29)
a) Calculate the EMF
of the cellfor the reaction
Mg,", +ZAg[n) ------+Mgilo) +2Ag(s)
Given : EoMg'* /Mg
.
- -2.37V
EoAg*/Ag=Q.B9V
tMg2*l = Q.oo1M; [Ag*] = o.ooo1 M
4
log 105 = $,
b) What are fuel cells
1
?
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34(NS)
-1+
I
30) a) Derive integrated rate equation for the f irst order
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reaction.
3
b) According to collision theory, what are the two factors that lead to effective
collisions
31 ) a)
?
2
Write any two differences between physisorption and
b) Name the phenomenon/effect for the following
chemisorption.
2
:
i) Colloidal particles are inzig-zag motion.
1
is applied across two platinum electrodes
dipping in a colloidal solution, particles move towards one or the other
ii) When an electrical potential
electrodes.
1
iii) Scattering of light by colloidal
sol.
1
V. Answer any four of the following. Each question carries f ive marks.
(4x5=20)
32) a) Write equations for the steps in Spr mechanism of the conversion of
2
tert.butyl bromide into tert. butyl alcohol.
b) ldentify the products A, B and C in the following equation
cHsoH R99P ,n
clz
NaI
dry acetone
cGHS,l
B Na and dry
, ether
. ,c.
33) a) Write the mechanism of acid catalysed dehydration of ethanol to ethene.
b) Explain Williamson's reaction. Write the general equation.
3
3
2
34) a) Write the organic compound formed in the following equations.
+cHscocl
i)
Atcts
cH{
iii) cH, b)
Mg
-
Br +
CO,
dry ether
Hgo*
>
.
Explain HVZ (Hell-Volhard-Zelinsky) reaction with equation.
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34(NS)
-15-
35) a) ldentify the reactant'A' in the following reaction
A
-
:
2 R - X -------) R4 N*X-.
bli Explain Hoffmann's bromamide degradation reaction forthe preparation of
rnethanamine.
c) Which is more basic among aqueous solutions of aniline and ammonia ?
Give one reason.
2
35) a) Write Haworth structure for maltose.
b) What
c)
2
is meant by denaturation of proteins ? Which level of structure
remains intact during denaturation of globular protein ?
2
Name the base present only in DNA but not in RNA.
1
37) a) Write the partial structure of
3
i) Neoprene
ii) Terylene (Dacron)
iii)
b)
Nylon
-
6.
Explain the preparation of Buna-N with equation.
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