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i next, Kanpur, 18 January 2014
“You can’t build a reputation on what you are going to do.” Henry Ford@DailyInspireQ
17
Model Test Paper (Chemistry): CBSE
Chemistry
Class: XII
Time: 3 Hours M. M. : 70
General Instructions
1. All questions are Compulsory
2. Q. Nos. 1 to 8 are very short
answer questions of 1 mark each.
3. Q. Nos. 9 to 18 are short answer
questions of 2 marks each.
4. Q. Nos. 19 to 27 are also short
answer questions of 3 marks each.
5. Q. Nos. 28 to 30 are long
answer questions of 5 marks each.
6. Use log tables if necessary.
1. How does an increase in
temperature affect both physical
as well as chemical adsorption?
2. Name the method used for
refining of Titanium metal.
3. Complete the following chemical
equations (a) C+ H2SO4 (conc.)
(b) Cl2 +F2 (excess)
4. Write the IUPAC name of the
following compound
C (CH3)3
I
CH3-CH2-CH2-CH-CH-CH2-CH3
I
I
5. Rearrange the following
compounds in increasing order of
their boiling points: CH3CHO,
CH3CH2OH, CH3OCH3,
CH3CH2CH3
6. Convert p-toluidene to
m-bromotoluene.
7. What are the products of
hydrolysis of lactose?
8. Give one difference between
a homopolymer and a copolymer
with one example of each.
9. Distinguish between
(1) Hexagonal and monoclinic
unit cell
(2) Conductor and insulator
10. Silver crystallises in fcc lattice.
If the edge length of the unit cell
is 4.07x10-8 cm and the density of
silver is 10.5 g cm-3, calculate the
atomic mass of silver.
11. Calculate the emf of the cell in
which the following reaction takes
place
Ni(s) + 2Ag+ (0.002M) → Ni2+
(0.160M) + 2 Ag(s) given that
E0 cell = 1.05 V
12. (a) What will be the order
of reaction whose rate constant
k=2.3x10-5 Lmol-1s-1
(b) The conversion of molecules X
to Y follows second order kinetics.
If concentration of X is increased
to three times how will it affect the
rate of formation of Y?
13. Explain the role of (1) Cryolite in
the electrolytic reduction of alumina
(2) CO in the extraction of Ni.
14. Draw the structure of the following
molecules (a) XeO3 (b)H3PO4
15. Account for the following (a)
Dinitrogen is a gas but phosphorus is
solid (b)Halogens are coloured.
16. Explain hydroboration - oxidation
process.
17. Write the equation involved in the
following reactions :
(1) Kolbe’s reaction
(2) Nitration of phenol
18. Define condensation and addition
polymers. Give an example of each.
OR
Draw the structure of the monomers
of the following polymers
(a) Nylon 6 (b) Terylene
19. The half life period for decay of
radioactive 14C is 5730 years. An
archaeological artefact containing
wood had only 80% of 14C activity
which is found in a living tree. Calculate
the age of the artefact.
20. Explain the following terms.
(a) Peptization
(b) Associated colloids (c) Electrophoresis
21. Give reasons for the following
(1) PCl5 exists but NCl5 does not (2) Oxidizing power of Fluorine is
greater that of chlorine. (3) PH3 is a lewis base.
22. For the complex [Cu (NH3)4]2+, give
(a) the hybridisation
(b) shape of the complex
(c) IUPAC name (atomic number of
Cu=29)
OR
State the kind of isomerism possible
for the following
(i) [Cr (en)3]3+
(ii) [Cr(NH3)4 ClBr] Br (iii) [Cr(NH3)4Br2]2SO4
23. Give reasons for the following
(1) Grignard reagent should be
prepared under anhydrous conditions.
(2) The dipole moment of
chlorobenzene is lower than that of
cyclohexyl chloride.
(3) Alkyl halides, though polar are
immiscible with water.
26. (a) Calculate ٨ 0m for acetic acid.
Given that ٨ 0m (HCl) = 426 S cm2
mol-1, ٨ 0m (NaCl) = 126 S cm2 mol-1,
٨ 0m(CH3COONa) = 91 S cm2 mol-1
(b) How much electricity is required
in coulomb for the oxidation of 1 mol
of H2O to O2.
27. Nita observed that her mother
got tired after doing every little work.
She felt lethargic and did not have
the energy to do work. She took
her mother to a doctor. The doctor
diagnosed her mother with pernicious
anaemia. Nita helped her mother in
household work till she recovered and
took her care.
(1) Name the vitamin whose deficiency
caused pernicious anaemia.
(2) Name the sources which will
provide this vitamin.
(3) Mention the values shown by Nita.
28. (1) Define the following terms:
a) Van’t Hoff factor
(b) Non-ideal solution
(c) Mole fraction
(2) 18 g of glucose C6H12O6, is dissolved
in 1 kg of water in a saucepan. At what
24. Complete the following reactions:
temperature would the water boil at
(1) C6H5NH2 + Br2(aq)
1.103 bar. (kb for H2O=0.52 k kg mol-1)
i) HBF4
OR
(2)C6H5N2Cl (a) Define the term osmotic pressure.
ii) NaNO2/Cu
(b) Explain why a solution of chloroform
(3) C6H5NH2 + Conc.H2SO4 and acetone show a negative deviation
from Raoult’s law. (c) A solution of
25.
glucose in water is labelled as 10%
(a) What class of drug is Equanil?
by weight. What would be the molality
(b) Explain the term food preservatives
of the solution?
with one example.
29. (1) Give reasons for the following
(c) How do antiseptics differ from
(a)The oxidising power of oxoanions
disinfectants? Give one example each.
are in the order VO2+ < Cr2O7 2-<MnO4(b) Cr2+ is a stronger reducing agent
concept pic
than Fe2+ (c) The enthalpies of
atomisatipon of the transition metals
are high.
(2) Complete the following equation
(a) Cr2O7 2- + Sn2+ + H+ →
(b) MnO4- + Fe2+ + H+ →
OR
(1) How would you account the
following? (a)The E0 value for the Mn3+
/Mn2+ couple is much more positive
than that for Cr3+/Cr2+ couple or Fe3+/
Fe2+ couple (b) The highest oxidation
state of a metal is exhibited in it’s oxide
or fluoride.
(2) What is lanthanoid contraction.
Write the consequences of it.
30. (a) How will you convert the
following
(1) Ethanal to But-2-enal
(2) propanone to propene
(3) Benzaldehyde to Benzophenone
(b) Give simple chemical test to
distinguish between
(1) Ethanal and propanal
(2) phenol and Benzoic acid OR
(A) Write the products of the following
reactions :
Zn – Hg
(1) CH3CHO ?
Con. HCl
H2
(2) C6H5COCl
?
Pd – BaSO4
(3) C6H5CHO +H2NCONHNH2 ?
(B) Which acid of each pairs shown
here would you expect to be stronger
(1) CH3COOH OR F - CH2COOH
(2) CCl3COOH OR C6H5OH
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Prepared by: Divya Srivastava
and Rama Sharma
Maharishi Patanjali Vidya
Mandir, Allahabad
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