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II PUC Chemistry (34)
Blue Print of Model Question Paper 5
Group Unit Title Hours Marks
Part-A
I
10x1 mark
Part B
II
8x2 mark
Part C
III
8x3 mark
Part D
IV & V
11x5 mark
Total
Group-I
Physical
1 The Solid state 8 7 ü ü ü 8
2 Solution 9 8 üü ü 7
3 Electrochemistry 9 8 ü ü ü 8
4 Chemical kinetics 9 8 ü ü ü 8
5 Surface chemistry 6 5 ü 5
Total of Group-I 41 36 36
Group-II
Inorganic
6 General principles and processes of isolation of elements
5 4 ü ü 4
7 The p-block elements 11 10 ü üüü 10
8 The d and f-block elements
9 8 ü üü 8
9 Coordination compounds 7 6 üü 6
Total of Group-II 32 28 28
Group-III
Organic
10 Haloalkanes and haloarenes
7 6 ü ü 6
11 Alcohols, phenols and ethers
8 7 ü ü 7
12 Aldehydes, ketones and carboxylic acids
9 8 ü ü ü 8
13 Amines 6 5 ü 5
Time : 3 Hrs. 15min.
14 Biomolecules 7 6 ü ü 6
15 Polymers 5 5 ü 5
16 Chemistry in everyday life
5 4 üü 4
Total of Group-III 47 41 41
TOTAL 120 105 11 14 24 30 105
SECOND PUC MODEL QUESTION PAPER -5
Time 3.15 Hr Marks-70
Instructions:
1. The question paper has four parts: A, B, C and D. All the parts are compulsory
2. Write balanced chemical equations and draw labelled diagram wherever required.
3. Use log tables and simple calculators if necessary
(Use of scientific calculators is not allowed)
PART- A
I. Answer all the questions (Each questions carries 1 mark) 10 x1 = 10
1. How many particles are present in a unit cell of fcc?
2. What happens to the vapour pressure of the liquid when temperature is increased?
3. Write the mathematical expression of Henry’s law.
4. State Faraday’s first law of electrolysis.
5. Give an example for a ter molecular reaction.
6. Name the method used for purification of silicon.
7. Identify the product A in the following reaction
XeF6 + 2 H2O → A + 4HF
8. What are enantiomers?
9. Among methanoicacid, ethanoicacid and propanoicacid which one is most acidic?
10. Which vitamin deficiency causes the disease scurvy?
PART- B
II. Answer any FIVE of the following. (Each questions carries 2 marks) 5 x 2 = 10
11. What are ferromagnetic substances? Give an example.
12. Draw a schematic diagram of H2- O2 fuel cell.
13. Define activation energy. What is the effect of a catalyst on the activation energy of a reaction
14. What are lanthanoids? Write the most common oxidation state of lanthanoids.
15. What is Williamson’s ether synthesis? Give an example.
16. How do you convert ethanoic acid into 2-chloro ethanoic acid? Name the reaction.
17. Name the class of the drugs to which the following belong?
i) Dettol ii) Brompheniramine ( Dimetapp)
18. Give an example for each of the following
a) Artificial sweetening agents b) Detergents.
Part – C
III. Answer any FIVE of the following (Each question carries 3 marks) 5 x 3 = 15
19. Write the chemical equations involved in the extraction of blister copper
from copper matte. 3
20. Decribe the manufacture of ammonia by Haber’s process. 3
21. a) Explain the oxidizing property of ozone with lead sulphide. 2
b) Write the structure of pyrosulphuric acid 1
22. Complete the following equations 3
I .S8 + 4 Cl2
II. NH3 + HCl
III. Br2 + 5 F2 (excess)
23. a) Give reason: Solution containing Cu2+ ion is coloured whereas Cu+ is colourless. 2
b) Name the 3d element which contains highest number of unpaired electrons in the ground state. 1
24. Explain the preparation of potassium permanganate from manganous dioxide. 3
25. With the help of VBT, explain the hybridisation, geometry and magnetic property of [Ni(CN)4]2-
3
26. a) Write the energy level diagram for the crystal field splitting in octahedral complexes. 2
b) Write the IUPAC name of [Cr (H2O)6]Cl3 1
Part –D
IV. Answer any THREE of the following (Each question carries 5 marks) 3 x 5 = 15
27. a)Calculate the packing efficiency in bcc crystal.
b) An element having atomic mass 60 has fcc lattice, the edge length of the unit cell
400 pm. Calculate the density of the crystal (NA= 6.022 x 1023) (3 + 2)
28. a) A 5.50 g sample of a non-volatile solute is dissolved in 250 g of benzene the
freezing point of this solution is 1.020C below that of pure benzene. Calculate the
molar mass of the solute (Kf for benzene = 5.120C/mol)
b) State Raoult’s law. Write its mathematical expression (3 + 2)
29.a) Calculate the emf of the cell Zn(s)│ Zn2+ (0.2M)║Cu2+(0.1M)│ Cu(s).
Given E0Zn = -0.76 V and E0
Cu = +0.34 V at 250C
b) Define molar conductivity. How is it related to conductivity of the solution? (3 + 2)
30 a) Derive integrated rate equation for the rate constant of zero order reaction.
b) The rate constant of a first order reaction is 1.2 x10-3 s-1. Calculate half-life period of the reaction. (3+2 )
31. a) Write any two differences between physisorption and chemisorption?
b) What is coagulation of colloids? Mention one method of coagulation of lyophobic sols.
c) Give an example for shape selective catalyst. (2 + 2+ 1)
V. Answer any FOUR of the following (Each question carries 5 marks) 4x 5 = 20
32. a) i)Explain dehydrohalogenation of alkyl halides with an example. 2
ii) Write the name of the following reaction
R-X + NaI →R-I + NaX where X = Cl, Br 1
b) Mention two reasons to show haloarenes are less reactive towards nucleophilic substitution reactions. 2
33. a) Write the mechanism of dehydration of ethanol to ethene? 3
b) Name the conjugated diketone formed, when phenol is treated with
chromic acid? Write the chemical equation. 2
34. a) How is benzaldehyde prepared by Rosenmund’s reduction? 2
b) What happens when propanone is heated with sodium hypoiodite?
Write the chemical equation. 2
c) Name the product produced when ethanal is treated with dilute alkali
followed by heating. 1
35. a) Explain the preparation of primary amines by Gabriel phthalimide synthesis. 3
b) Explain Sandmeyers reaction with an example. 2
36. a Give the reaction to show that
i) Glucose contains 5- OH groups
ii) Glucose contains a carbonyl group 2
b) What are hormones? Mention the function of thyroxin. 2
c) Name the nitrogeneous base present only in RNA. 1
37. a) Explain addition polymerisation with an example. 2
b) What are biodegradable polymers? Give an example 2
c) Give an example for synthetic rubber. 1
Scheme of valuation for model question paper for model question paper -5
Note : Any other correct alternate answer can be honoured wherever applicable
Q.No
Value points Marks
I PART- A
1 4 or four 1
2 Increases 1
3 p = KH x 1
4 The mass of the substance liberated or deposited on an electrode is directly proportional to the quantity of electricity supplied. or any other suitable definition
1
5 2 NO + O2 → 2NO2 or any other suitable example 1
6 Zone refining 1
7 XeO2F2 1
8 The optical isomers of a compound which are non- superimposable mirror images of each other.
1
9 Methanoic acid 1
10 Vitamin C 1
II PART- B
11 The substances which are strongly attracted by the magnetic field
Ex. Fe Co, Ni etc.
1
1
12
2
O2 H2
Anode – Cathode +
H2O
Aqueous electrolyte
13 The minimum extra energy that the normal reactant molecule has to acquire in order to attain threshold energy. or Energy required to form the activated complex
Ea decreases
1
1
14 The 14 elements following lanthanum.
or The elements in which the differentiating electron enters the 4f orbitals
+ 3
1
1
15 When bromoethane is treated with sodium ethoxide, ethoxy ethane is obtained
or general statement
C2H5Br + C2H5ONa → C2H5 –O – C2H5 + 2NaBr
OR
Self-explanatory equation
1
1
2
16 When ethanoic acid is treated with chlorine in presence of red phosphorus,
2-chloro ethanoic acid is obtained
CH3COOH + Cl2 ClCH2COOH + HCl
OR
Self-explanatory equation
1
1
2
17 I. Antiseptic
II. Antihistamine
1
1
18 a) Saccharin or Aspartame or any other suitable example
b) sodium laurylsulphate or sodium dodecylbenzenesulphonate or any other suitable example
1
1
Red P
III PART- C
19 2FeS +3O2→ 2FeO + 2SO2
FeO + SiO2→ FeSiO3
2Cu2S + 3O2→ 2 Cu2O + 2SO2
2Cu2O + Cu2S →6Cu +SO2
1
1
1
20
N2 + 3H2 2 NH3
Conditions: T = 700K P= 200atm catalyst = Iron oxide with small amount of K2O & Al2O3
1
1
1
21 a) Ozone oxidises lead sulphide to lead sulpahate
PbS + 4O3→ PbSO4 + 4 O2
1 1
b) O O
║║
O = S –- O —S =O
l l
OH OH
1
22 i S8 + 4 Cl2 4 S2Cl2
ii. NH3 + HCl NH4Cl
iii. Br2 + 5 F2 (excess) 2 Br F5
1
1
1
23 a) Cu2+ ion has d9 configuration, it contains one unpaired electron and d-d
transition takes place.
Cu+ has d10 configuration and has no unpaired electrons, so
d-d transition does not take place
b) Chromium
1
1
1
24. a) KmnO4 is prepared by the fusion of MnO2 with KOH and an oxidising agent
like KNO3followed by acidification.
2MnO2 + 4KOH + O2 → 2 K2MnO4 + 2 H2O
3 MnO42— + 4 H+ → 2 MnO4
-- + MnO2 + 2 H2O
1
1
1
25.
Since it has dsp2 Hybridisation the geometry is Square planar
Since it does not contain any unpaired electron it is diamagnetic in nature
1
1
1
26 a)
b) hexaaquachromium(III) chloride
2
1
Packing efficiency in Body-centred cubic structure:
27 In the triangle EFD
Face diagonal, 2 2 2 2b a a 2a= + =
∴ b 2 a= ⋅
Now in the triangle AFD
Body diagonal 2 2 2c b a= +
2 2 2c 2a a= +
2 2c 3a=
∴c = 3 a⋅
Length of body diagonal c = 4r
3 a 4r⋅ =
∴r=3 a
4⋅
Packing efficiency = Volume occupied by 2 speres in the unit cell 100
Total volume of the unit cell×
3
3
42 r3 100a
× π= ×
=
3
3
4 22 32 a3 7 4
100%a
× × × ×
×
3
3
4 22 3 32 a3 7 64 100%
a
/
/
⋅× × × × /
= ×/
= 68%
b)
1
1
1
( )=
=
=
3
31 3
A
3
0 2
4 X 60 6.227 g / cm
400 x10 x 6.022 x 10
zMda N
1
1
28 a)
× ×
× ×
=∆ ×
= =×
f B
f A
5.12 5.5
K w
1000 110.43 g / mol1.02
1000d
T w
d250
b) Partial vapour pressure of each volatile component in the solution is directly
proportional to its mole fraction.
p1 α x1 or 1 101p x p=
1
1+1
1
1
29
a) E0cell = E0
Cu – E0Zn
= 0.34 –(-0.76)
= 1.1 V
1
1
( )
+
+= −
=
=
=
=
−
20
cell cell 2
cell
0.0591 [Zn ]E E log2 [Cu ]
0.0591 0.2E 1.1 log2 0.1
1.1 – 0.0295 log 2
1.1 – 0.0295 x 0.3010 1.09 V
b) The conductivity of all the ions present in solution containing
one mole of the electrolyte.
Relation: λm = K/c
1
1
1
30 a)
= − 0
R Rk
t
1
1
b) =
=−
12
12
0.693tk
0.693t
31.2 x10
= 577.5 s
1
1
1
31 a)
Physical adsorption Chemical adsorption
It involves weak vander Waal’s force It involves strong chemical bond
It is not specific in nature It is specific in nature
It is reversible It is irreversible
Enthalpy of adsorption is low The enthalpy of adsorption is high
Multimolecular layer of adsorption Monomolecular layer of adsorption
Activation energy is low Activation energy is High
Etc ….. Any two differences
b) The process of settling of colloidal particles is called coagulation
Addition of electrolyte or electrophoresis or any other suitable method
c) ZSM-5 or any other suitable example
2
1
1
1
32 a) i) When bromoethane is heated with alcoholic potash ethene is formed
or general statement
1
C2H5Br + alc KOH → C2H4 + KBr + H2O
or any other suitable example
ii) Finkelstein reaction
b) - Halogen is bonded to sp2hybridised carbon
- Due to resonance
- Partial C- X double bond character etc
( any two )
1
1
2
33
a)
Mechanism of dehydration of ethanol: It involves the following steps. Setp1: Protonation of alcohol
Step2: Formation of carbocation
Step3: Elimination of proton
H2C CH2H C C
EtheneH+
H
H H
H
b) Benzoquinone is formed
Equation
1
1
1
1
1
34
a) When benzoyl chloride is heated with hydrogen in presence of deactivated
palladium catalyst benzaldehyde is formed
1
Pd/ BaSO4
C6H5COCl + H2 C6H5CHO + HCl
b) Iodoform and sodium acetate are formed or iodoform is formed
NaOI
CH3COCH3 CH3COONa + CHI3
c) Crotonaldehyde or But-2-enal
1
1
1
1
35. a)
b) When benzene diazonium chloride is heated with cuprous chloride in con HCl
1
1
1
chlorobenzene is formed
Cu2Cl2/ con HCl
C6H5 N2CCl C6H5Cl + N2
or any other suitable answer
1
1
36. a) i) When glucose reacts with acetyl chloride or acetic anhydride penta- acetyl
glucose is formed
ii) When glucose reacts with hydroxyl amine forms oxime is formed
b) Biochemical messenger are called Hormones
or
Chemical substances secreted by ductless (endocrine glands )
Growth and development
c) Uracil
1
1
1
1
1
37. a) The process of repeated addition of monomer molecules to form a polymer
n(CH2= CH2) -(CH2—CH2-)n
or any other suitable example
b) The poymer which undergoes decomposition by biological means is called
biodegradable polymer
Ex: PHBV Or any other suitable example
1
1
1
1
c) BuNa-S or Neoprene , any other suitable Example
1
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