XII 2017 CBSE MODEL CHEMISTRY PAPER SET-2
CLASS - XII
CHEMISTRY MODEL PAPER – (043)—2017
SET-2
Time : Three hour
Max. Marks : 70
General Instructions :-
1. Time: Three
Hours
Max. Marks: 70
General Instructions:-
1.All questions are compulsory.
2. Question No.
1-5 are very short answer questions and carry 1 mark each.
3. Question No.
6-10 is short answer questions and carries 2 marks each.
4. Question No.
11-22 is also short answer questions and carries 3 marks each.
5. Question No.
23 is value added questions and carry 4 marks.
6. Question No.
24-26 carry 5 marks
7. Use log
tables if necessary, use of calculators is not allowed.
Q1. Give an example of artificial sugar which may be
safe for diabetic patient 1
Q2. What do you mean by electrophoresis.? 1
Q3. Drow the structure of peroxidisulphuric acid. 1
Q4. Write IUPAC name of given compound:-
CH3-CH2-N.(CH3
)3 1
Q5.In an ionic compound the
anion (N¯) form cubic close type of packing. While the cation (M+)
ions occupy one third of the tetrahedral voids. Deduce the empirical formula of
the compound and the coordination number of (M+) ions. 1
Q6.(i) What is the reverse osmosis.How it may be useful.
2
(ii)What do
you mean by zeoliote.
Q7.(i) Write significance of Mond process. 2
(ii) What is
role of pine oil in froath flotation process.?
Q8. (i) XeF 4 +
H2 O ----------à 2
(ii)P4 +
NaOH + H2O
------------à
Q9.On dissolving 19.5 g of CH2FCOOH in 500 g of water a
depression of 1 0C in Freezing point of water is observed. Calculate
the Vant Hoff factor. Given Kf =
1.86 K Kg mol-1 2
Q10.Calculate
the ratio between time taken to complete a reaction 90% and 99%.
Q11.(i)What is faraday first law of electrolysis.
(ii)Write
equation only occour during discharging and recharing of lead storage battery. 3
Q12. (i)What happen when glucose react with hydroxyl
amine. Give reaction also.
(ii)Give
a chemical reaction of glucose which prove that glucose contain five
alcohol group.
(iii)Give an example of natural polysaccharide. 3
Q13. (i) What is zwitter ion.?
(ii) Give
example of food preservative.
(iii)What
is role of sleeping pills in tranquilizes. 3
Q14. (i)Describe the mechanism of the formation of ethene
from ethanol in the presence of concentrated sulphuric acid.
(ii)Give
mechanism for the preperation of ether from alcohol at normal temperature in
presence of aluminium oxide. 3
Q 15. Complete and name the following reactions: 3
(i) C6H6 + CH3cl ------ anhydroud Alcl 3---------à
(ii)C 6H
5OH + CHcl3
+ KOH --------------------à
(iii) CH3
COCH 3 + 4 I 2 + 6
NaOH -------à
Q16. Give chemical tests to distinguish between compounds
in each of the following pairs:
(i) Ethyl
chloride and chlorobenzene
(ii) Propanal
and propanone 3
Q 17. Predict, giving reasons
(i) C 6H
6 , C 6H 5CH
3. C 6H 5C
2H5 (Electrophilic
substitution order)
(ii) CH 3COOH,CH
2FCOOH , CH 3CH 2COOH (Acidity order)
(iii) (CH3)2
NH , (CH3)3
N ,
CH3 NH2 (Basicity order) 3
OR
Account for the
following:
(i) Aniline
does not undergo Friedel Crafts alkylation
(ii)Pka of aniline is more then that of methyl amine.
Q18. Give reasons for the following :
(i) What happen when we put R.B.C.into 1% aqueous solution of Nacl.
(ii) What is adsoption isotherm. 3
(iii)Define azetropic solution with example.
Q19.(a) Analysis shows that a metal oxide has
the empirical formula M0.96 O1.00. Calculate the
percentage of M2+ and M3+ Ions in this crystal?
(b)Why density
decrease during schottky defect.? 3
.
Q20. (a)Write names of monomer/s of the following
polymers and classify them as addition or condensation polymers.
(1)
Melamine formaldehyde
(2) Nylon-2 Nylon-6
(b)What is biodegredable polymers. Give an example? 3
Q21. (a) Give the IUPAC name of :
[Cr Cl2(H20)4 ]Cl
(b) Find out geometry and magnetic moment of the following
complex ions:
(i) [Fe(CN)6 ] 4- (ii)
[Fe(H2 O)6 ]3- 3
22. Explain the following observations:
(a) Ferric
hydroxide sol gets coagulated on addition of sodium chloride solution
(b) What is
hjardy schulze rule.?
(c) Heat of adsorption is high in chemiosorption.why?
Q23. Rajesh went to textile shop with his mother to
purchase dress material for his school uniform. Rajesh wanted pure cotton
fabric which looked bright, while mother insisted on blended fabric with 67%
terylene.
a) In your opinion, who is right?
b) What are the
monomers of Terylene?
c) What are the
values involved in the selection of the fabric? 4
Q24.(a)Log k= 14.34 - 1.25x104k/T .This
equation follows the first order kinetics..
Find
out activation energy. And at what temperature its half life Will be 256 min?
(b) A reaction is second order with respect to a reactant. How is the
rate of the Reaction affected if the concentration of the reactant is
i) Doubled
ii)
Reduced to ½ 5
Q25. (a) Complete the following
reaction
(i)CH 2=CH-CH 3
——O3—— A ——Zn/H 2O—— B
|
Dry
ether H2O
(ii) CH
3- CH 2 Br + Mg ————C ———— D
Hg2+/H+
(iii) CH3 — C . C — CH3——— D ——— E
553K
(b) Convert the following.
(i)Phenol into aniline
(ii)Ethane amine into methane amine 5
Q26. Give reasons for the following:
(i) Among the halogens F2 is the
strongest oxidizing agent?
(ii ) Fluorine exhibits only – 1
oxidation state whereas other halogens
Exhibit higher positive oxidation states also.
(iii) Acidity of oxo acid of chlorine is
HOCl < HOClO < HOClO2
< HOClO3 5
OR
(a)A mixed oxide of iron and chromium FeOCr2O3
is fused with carbonate in the presence of air to form a yellow coloured
compound (A). On acidification the compound (A) forms an orange coloured
compound (B), which is a strong oxidizing agent. Identify
(i) The compounds (A) and (B)
(ii) write balanced chemical equation
for each step
(b)Why IBr is more reactive then Br2.
(c) Why Pcl5 is not stable on
heating?
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