CBSE MODEL SET PAPER OF CHEMISTRY 2016
1.
Name the defect that shown by crystal
of silver bromide. ? 1
2.
The decomposition reaction of ammonia
gas on platinum surface has a rate
Constant k = 2.5 x 10–4 mol L–1 S–1.What
is the order of the reaction? 1
3.
Give the IUPAC name of the following
compound
C6H5NHCH3
1
4.
How many octahedral voids are there in
l mole of a compound having cubic close packed structure? 1
5.
How catalysts increase the rate of
reaction? 1
6.
In each of the following pairs of
organic compounds, identify the compound
Which will undergo SN1 reaction faster? 2
(a) 2-Isopropyl hexane
(b) 2- Methyl butane
OR
A compound ‘X’ (C2H4O)
on oxidation gives ‘Y’ (C2H4O2). ‘X’ undergoes
halloform reaction. On treatment
with HCN ‘X’ forms a product ‘Z’ which on
hydrolysis gives 2- hydroxy propanoic
acid?
(i) Write down structures of ‘X’ and
‘Y’.
(ii) Write down the equations for the
reactions involved
7.
Write chemical reaction for the
formation of H2SO 4 by contact process? 2
8. Benzoic acid completely dimerises in
benzene. What will be the vapour
pressure of a solution containing 61g of benzoic acid per 500g benzene when the vapour pressure of
pure benzene at the temperature of experiment
is 66.6 torr? What would have been the vapour pressure in the absence
of dimerisation? 2
9.
An element E crystallizes in body centred cubic structure. If the edge length of the cell is 1.469 x 10–10
m and the density is 19.3 g cm-3, calculate the
Atomic mass of this element. Also calculate
the radius of an atom of this element.
?
2
10) Write the Nernst equation and calculate EMF. of the
following cell at 298 K.
Mg (s) Mg2+(0.001M) ll Cu2+(0.001M)l
Cu(s)
Given: E0mg2+/mg=-2.37V,
E0cu2+/cu =+0.34 V.
2
11
(a) Adsorption of a gas on the surface of solid is generally accompanied by
a decrease in entropy. Still it is a spontaneous process. Explain.
(b) What is Hardy scheulze rule?
(c)What do you mean by
electrophoresis? 3
12.
(a)
Which aqueous solution has higher concentration -1 molar or 1 molal solution of the same solute? Give
reason.
(b) 0.5g KCl was dissolved in 100g
water and the solution originally at 200C,
froze at – 0.240C. Calculate the percentage ionization of salt. Kf per 1000g of water = 1.86K. 3
13. (a) What is the
covalence of nitrogen in N2O5?
(b)When conc. H2SO4 was added into an
unknown salt present in a test tube,
a brown gas (A) was
evolved. This gas intensified when copper turnings were also added into this test-tube. On cooling, the gas
(A) changed into a colourless gas (B).What is A and B
(a) Identify the gases A and B.
(b) Write the equations for the
reactions involved.
14. (a) which is a stronger acid HclO3 or
HclO4? Explain? 3
(b)BrF3 is more reactive then
I2?
(c)Why does O3 act as
powerful oxidizing agent?
15. Define with example
(a)
Carbylamines reaction.
(b) Cannizaro reaction. 3
(c)Rosenmund reduction reaction
16. (a) Drow the structure of
(i) HclO3 (ii)XeF4
(b)
Complete the reaction
(i) 4H3PO3 ---------à
(ii) Zn(s) + dil HNO3 ------à 3
17. How will you distinguish between?
(a) CH3 NH2 and (CH3)
3 N
(b)Phenol and benzyl alcohol.
(c) Ethanoic acid and methanoic acid 3
18. (a) Give mechanism of preparation of ethoxy
ethane from ethanol. ?
(b)Show by mechanism for the preparation of alkenes from ethyl
chloride
in
presence of base?
(c) Why Garbriel
pthalamide give only aliphatic amine? 3
19.
(a) A current of 1.50 amps was passed through an electrolytic cell containing AgNO3 solution with inert electrodes. The weight of Ag deposited was 1.50g. How long did the
current flow?
(b) What is molar conductivity?
(c) Write two advantage of fuel
cell? 3
20. a) Define activation energy.
b)
What is collision frequency?
c)
Write unit for the 3/5 order of reaction. 3
21. (a) Name the method
used for refining of
(i) Nickel
(ii) Zirconium
(b) The extraction of Au by leaching with NaCN
involves both oxidation and Reduction. Justify giving equations. 3
22. An Unknown Aldehyde ‘A’ on reacting with
alkali gives a -hydroxy – aldehyde,
which losses water to form an unsaturated aldehyde, 2- butenal. Another aldehyde ‘B’ undergoes
dissproportaionation reaction in the presence
of conc. alkali to form products C and D. C is an aryl alcohol with the formula C7H8O.
(i) Identify A and B.
(ii) Write the sequence of reactions
involved.
(iii) Name the product, when ‘B’
reacts with Zinc amalgam and hydrochloric acid.
3
23. Kalpna was suffering
from anemia. she visited nearby hospital. Doctor advised her iron contain diet
and prescribed some vitamins tablet. But Mrs. Kalpna has a 6 month baby, she
doesn’t tell anything to the doctor about child. Give the answer of the
following question after reading this passage---
(a)Which vitamins doctor gives her?
(b)Why she was suffering from anemia?
(c)Is it was good to hide to doctor
about the child of 6 month?
(d)Which salt tablet she should take
continue with anemia tablet after
Consult to doctor?
4
24. (a) Write IUPAC name of
the complex
K4[Fe (CN)6(H2O)3]
(b) Give the electronic splitting
diagram of [Ti (H2O)6]3+ in an octahedral crystal field.
(b) Why is [Nicl4]2-
complex coloured? But [Ni (CO)4 ] is colourless?
5
OR
(a)Write IUPAC name of the
complex
Na4[Cu (CO)6(en)3]
(b)What do you mean by chelation?
(c) What do you mean by ionization
isomerism? Give example?
(d)On the basis of crystal field theory, write
the electronic configuration of d4
ion, if ^0 <P.
5
25. (a) What is the role
of Benzyl peroxide in polymerization of ethene?
(b) What are LDPE and HDPE? How are
they prepared?
(c) Classify synthetic detergents
giving an example in each case.
(d) What are antihistamines? Give two
examples. Explain how they act on the human body.
(e)-Except for vitamin B12,
all other vitamins of group B should be supplied regularly in diet. Why 5
OR
(a) What are tranquilizers? Give one example?
(b)
Write monomers structure of Buna-N?
(c)
What is harmful effect of Aspirin?
(d)
Write the name of disease caused by vitamins D?
(e)
What are biodegradable polymers? Give example?
26. (i) What do you mean
by glycoside linkage?
(ii) What is zwiter ion?
(iii)
What do you mean by alpha Helix and beta pleated sheet?
(iv) Write two differences between DNA
and RNA
(v) What is isoelectric point?
5
OR
Give chemical reaction when glucose
reacts with
(i)Hydroxyl amine
(ii)Red P +HI
(iii)Acetic anhydride
(iv)What is peptide bond?
(v) Which vitamins deficiency caused anemia?
*********************************************************
DR
SUDHIR TOMAR
M.Sc
(inorganic chemistry & physical chemistry)
M.Ed,
ph.D,
Email;drsudhirtomar@gmail.com
Cont;
971870414
Thanks for the information about the details
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