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KENDRIYA VIDYALYA SNGATHAN, PATNA REGION ,PATNA
SAMPLE PAPER FOR SESSION ENDING EXAM - 2014-15
SUBJECT :- CHEMISTRY
CLASS :- XI
TIME :- 3 Hours
Max Marks :- 70
All Questions are compulsory
Q. 1 to 5 carry 1 marks very short Answer type
Q. 6 to 10 carry 2 marks short Answer type – I
Q. 11 to 22 carry 3 marks short Answer type – II
Q. 23 carries 4 marks: value based type
Q. 24 – 26 carry 5 marks long Answer type
1- What designation is given to an orbital having n = 4, l= 1
2- Why are S-block elements most reactive?
3- Can a gas with absence of intermolecular force be liquefied?
4- Write conjugate acid and conjugate base of HCO3-.
5- Give the IUPAC name of the following compound
CH-CH2-CH2-C-H
CH3
O
6- Define molarity and give its unit.What is the effect of change of temperature on molarity of
a solution?
7- Using VSEPR theory, draw the shape of SF4 and BrF5.
8- Give reason:(i)
Alkali metals dissolve in liquid ammonia to give deep blue solution.
(ii)
Be and Mg do not give colour to the flame whereas other alkaline earth metals do so.
9- (i) Indicate the number of Ϭ and π bonds in HCONHCH3
(iii)
Write bond line formula for Iso propyl alcohol.
10- Sodium salt of which acid will be needed for the preparation of propane? Write
chemical equation for the reaction.
11- (a) Calculate the molarity of Oxalic acid in the solution prepared by
dissolving 2.52gram in 250ml of solution.
(b) Round off the following in three significant figures.
(i)
1.239
(ii)
0.0126
12- (a)State Pauli’s exclusion principle
(b)Write the electronic configuration of Cr(24), and find out the
electrons present in it.
number of unpaired
13- Who proposed that matter has duel character, write the relationship between
wavelengths associated with mass moving with same velocity? Using the
above relationship calculate the wave length of electrons of Bohr’s 1st orbit
moving with velocity of 2.19x106ms-1.
14- Consider the following species.
N3-, O2-, F-, Na+, Mg2+, Al3+
a. Which term is associated with these species? Define the term.
Arrange them in order of decreasing ionic radii.
15-
Write the molecular orbital configuration, compare relative stabilities and predict
magnetic properties of O2 and O22.
Density of a gas is found to be 5.46 g/dm3 at 270C and at 2 bar pressure. What
will be its density at STP?
16-
17-
Predict the sign of entropy change in the following reaction with reason
→
(i)O2(g) + 2SO2(g)
2SO3(g)
(ii)CaC204(s)
→CaC03(s) + CO(g)
(iii)2H2(g) + 02(g) → 2H20(g)
18- -(a) Calculate oxidation number of Cr in CrO5.
(b) Balance the following redox reaction by ion electron method.
MnO4-(aq) + I-(aq)  MnO2(s) + I2(aq)(basic medium)
19- What causes the temporary and permanent hardness of water. Discuss the method of
softening hard water by Ion exchange method.
20- What happens when
(i)
(ii)
sodium metal is dropped in water ?
sodium metal is heated in free supply of air ?
sodium peroxide dissolves in water ?
21- Explain the following :(a) Carbon monoxide is more dangerous than carbon dioxide.
(b) Taj Mahal in India is effected by acid rain.
(c)What is B.O.D
22- Deduce the relationship: Cp – Cv = R, for one mole of a gas.
23- At a sweet shop in dilshad Nagar,Rahul bought some sweets. He requested to sales girl to
put the sweet box in a polythene bag .The sales girl refused to do so. Instead, she kept
the sweet in a paper bag. After reading the above passage answer the following
(a) Why did the girl refused to put the sweets box in the polythene bag
(b) As a student of chemistry, why would you advocate the use of paper instead
of polythene bag?
(c) Which value is promoted through the use of paper bag?
(d) Suggest one activity to promote these values.
24- ( a) Write Short notes on :(i)Common ion effect
(ii) PH,
(iii) Heterogeneous. Equilibrium
(b) A sample of HI (g) is placed in a flask at 0.2 Atm pressure. At
Equilibrium partial pressure of HI(g) is 0.04 atm. Calculate Kp for
2HI(g) H2(g) +I2(g)
OR
(a) What is the application of Buffer Solution?
(b) Write the expression for Kc for the reaction
CaCO3(s)CaO(s) + CO2(g)
(c) What is the effect of Catalyst and inert gas at constant pressure for the
reaction. 2So2(g) + O2(g) 2So3(g).
25-Give reasons:
(i) Conc. HNO3 can be transported in aluminium container.
(ii) A mixture of dilute NaOH and aluminium pieces is used to open drain.
(iii) Graphite is used as lubricant.
(iv) Diamond is used as an abrasive.
(v) Aluminium alloys are used to make aircraft body.
Or
A certain salt X, gives the following results.
(i) Its aqueous solution is alkaline to litmus.
(ii) It swells up to a glassy material Y on strong heating.
(iii) When conc. H2SO4 is added to a hot solution of X,white crystal
of Boric acid separates out.
Write equations for all the above reactions and identify X and Y.
26- Explain the following with reaction only
( i) Markownikoff’s rule
( ii) Wurtz reaction
( iii) Friedel craft reaction
(iv) β elimination reaction
(v)
Isomerisation reaction
OR
What is the necessary condition for any system to be aromatic .Explain why the following
system is not aromatic?
(i)
( ii)
CH2
+
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