1
HSE II
MODEL QUESTION PAPER - CHEMISTRY
Weightage to type of questions
Sl.No. Type of questions Score % of score
1 Objective or easy 12.5 20.83
2 Short answer or average 29.5 49.17
3 Essay or difficult 18 30
Total 60 100
Blue Print
Sl.No. Unit/Chapters Type of Questions Total
Objective Short Essay
answer
1 Solid state 4 4
2 Solutions 1 3 4
3 Electrochemistry 2 2 4
4 Chemical kinetics 3 1 4
5 Surface chemistry 1 2 3
6 General principles and processes of isolation of 1 2 3
elements
7 The p - block elements 1½ 3½ 5
8 The d and f block elements ½ 1½ 2 4
9 Coordination compounds ½ 1½ 2 4
10 Haloalkanes and haloarenes 4 4
11 Alcohols,phenols and ethers 1 1 2 4
12 Aldehydes , ketones and carboxylic acids 5 5
13 Amines 3 3
14 Bio molecules 1 2 3
15 Polymers 1 2 3
16 Chemistry in everyday life 1 2 3
Total 12.5 29.5 18 60
1
2
MODEL EXAMINATION—FEBRUARY 2010
CHEMISTRY
HSEII Max.Score:60
Time:21/4 hours
1. Defects are common in crystals
(a)Compare shottky and frenkel defects (2)
(b)When pure NaCl crystal is heated in atmosphere of sodium vapour,it turns yellow. Account for this
observation. (2)
2. A graph showing vapour pressure against mole fraction of solution with components A and B are
shown below. (Ideal solution)
Vapour PA +PB
pressure
PA
PB
XA=1 Mole fraction XA=0
XB = 0 XB=1
(a)Name the non-ideal solutions in which the attraction between the components A and B is weaker as
well as stronger than that of A-A and B-B force of attraction respectively (1)
(b)Resketch the diagram for the above two types of non-ideal solutions.
(c)Based on your observation predict the reason for the low volatility of a mixture of acetone and
chloroform. (1)
3. (a)Fuel cells re used in space shuttles .
What are fuel cells. (1)
(b)The cell reaction for a galvanic cell is:
Zn (s) + 2Ag+(aq) Zn2+(aq) + 2Ag(s)
Represent the galvanic cell . (1)
(c)Λ0m for NaCl, HCl and CH3COONa are 126.4, 425.9 and 91 Scm2 mol-1 respectively. Calculate
Λ0m for CH3COOH. (2)
4. Zero order reaction is independent of concentration of reactants.
(a) Write integrated rate equation for the above reaction. Write one example also. (2)
(b) Label the catalysed and uncatalysed reaction in the following diagram. (1)
2
3
P
o
t
e
n
t
i
a
l
e
n
e
r R
g
y P
Reaction coordinator
(c) A first order reaction is found to have a rate constant, k=5.5x 10-14 s-1. Find the half life of
the reaction. (1)
5. (a) Alums are used to purify water . Give reason. (1)
(b) A synthetic zeolite ZSM -5 converts alcohol to gasoline. Comment on the activity of zeolites .
6. (a)Ni (s) + 4CO Ni(CO)4 Ni + 4CO .
Name the above purification of Nickel. (1)
(b)Semiconductor grade silicon is obtained by zone refining. Describe the process. (2)
OR
6. (a) Write important ore of Aluminum (1/2)
(b)Briefly explain the concentration process of this ore. (11/2)
(c)What is the rate of Cryolite in the metallurgy of Aluminum. (1)
7. (a)Justify the following statements.
i.NH3 can for hydrogen bonds, but PH3 cannot.
ii.ICl is more reactive than I2.
(b)H3PO3 is dibasic acid. Write the disproportion reactions of H3PO3.
(c)Complete the table. (3x½ = 11/2 )
Molecules Hybridizations Geometry No. of ion pairs
XeF2 ------------- linear 3
XeF4 Sp3d2 square planar ------------
XeF6 Sp3d3 ----------- 1
OR
7. (a) Account for the following .
i. Nitrogen does not form penta halides.
ii. Acid strength varies in the order.
HF < HCl < HBr < HI (2)
(b)BiH3 is the strongest reducing agent among the hydrides of group 15. (1)
(c)Write the condition for maximise the yield of H2SO4 by contact process. (2)
3
4
8. (a)K2Cr2O7 is a powerful oxidizing agent.
Write its oxidizing action with (i) H2S. (ii) Iron(II) sulphate solution. (2)
(b)Lists of transition metal ions are given.
Ti2+, Cr2+, Mn2+.
i. Calculate the number of unpaired electrons in them. (11/2 )
ii. Select the ion having most magnetic moment. (1/2 )
9. Co3+ ion can form co-ordination compounds with [EDTA]- ion.
(a)Write the co-ordination number of Co3+ in[Co(EDTA)]- ion. (1/2)
(b)Indicate the type of isomerism exhibited by the following complexes.
i. [Co(NH3)5NO2]Cl2; [Co (NH3)5ONO] Cl2.
ii. [Co(en)3]Cl3.
iii. [Cr (H2O) 6Cl3;[Cr(H2O)5Cl]Cl2.H2O.
(c) Show that [CoF6]3- is a paramagnetic octahedral complex, using VBT . (2)
10. (a) In following pair of halogen compounds , which would undergo SN2 reaction faster? Give reason.
I and
(b)Predict the product of reaction. Cl
Br Alcoholic
CH3-CH2-CH2-CH-CH3 ?
KOH
State the rule behind it.
OR
10. Chloro benzene undergoes electrophilic substitution reaction. Explain.
(a) Nitration.
(b) Fredel craft’s alkylation of Chloro benzene. (4)
11. (a)Phenol is an acidic compound. Compare its acidity with paranitrophenol. (1)
(b)Predict the product.
OH 1. NaOH
2. CO2
?
3.H+/H2O
(c)You are provided with ethyl magnesium bromide.Select a carbonyl compound from the following,
to prepare propan-1-ol.Write equation.
a.Methanal b.Ethanal c.Propanone.
4
5
12. Complete the table.
Sl.No Reactants Main Products Name of the reaction
Cl
1 CH3COOH + Cl2/P ………..A……………
CH2 – COOH
Rosenmund reduction
2. ………… B………… CH3CHO
Zn - Hg
3. CH3CHO + H2 ………C……......... Clemmensen
Con.HCl reduction
4. CH3CONH2 + NaOH/ Br2 CH3NH2 ………. D ………….
N2Cl
5. Sand meyer’s reaction
CuCl ……….. E …………..
HCl
13.(a)The boiling points of 1°,2° and 3° amines is in the order 1°>2°>3°.Comment. (1)
(b) Identify A & B in the following reaction. OH (2)
A NaNO2 + HCl B H+/H2O
0° c
14. When an egg is boiled its physical texture changes.
a) Is there any change in its chemical nature? (½)
b) Mention the type of bond present in proteins (½)
c) Explain the secondary structure of proteins (2)
15. a) Name the monomer of Nylon – 6 (1)
b) Write a note on biodegradable polymers Write one example also (2)
16. a) Antibiotics are used as drugs to treat infections . In what way bactericidal and bacteriostatic
antibiotics differ. Write an example for each (2)
b) Aspartame is an artificial sweetener, but its usage is limited to cold food and soft drinks.
Comment (1)
