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PUBLIC EXAMINATION – MARCH 2019

11th
STD.
Time Allowed : 2.30 hours CHEMISTRY Marks : 70

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PART - I 8. What is pH of rain water ?
ANSWER ALL THE QUESTIONS: (15 × 1 = 15) (a) 5.6 (b) 4.6
1. Many of the organic compounds are inflammable (c) 6.5 (d) 7.5

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because of its :
9. Which compound is named as "Blue John" among the
(a) Vander Waal's force (b) Co-ordinate nature
(c) Covalent nature (d) Ionic nature following compounds ?
(a) Ca3(PO4)2 (b) CaO
2. When Δng is negative in chemical equilibrium reaction
then : (c) CaH2 (d) CaF2

s.
(a) Kp < Kc (b) Kp = 1/Kc 10. The element with positive electron gain enthalpy is :
(c) Kp = Kc (RT)–ve (d) Kp > Kc (a) Argon (b) Fluorine

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3273 K (c) Hydrogen (d) Sodium
3. CaO + 3C A + CO
(a) CaC2 (b) CO2 11. Which of the following molecule does not contain π
(c) Ca (d) Ca2O bond ?
(a) CO2 (b) H2O
4. Splitting of spectral lines in an electric field is called :
(a) Compton effect
o
(b) Stark effect (c) SO2 (d) NO2
(c) Zeeman effect (d) Shielding effect 12. Which of the following compound has same percentage
ab
5. Which of the following species does not exert a of Carbon as that of ethylene (C2H4) ?
resonance effect? + (a) benzene (b) ethane
(a) C6H5NH2 (b) C6H5NH3 (c) propene (d) ethyne
(c) C6H5OH (d) C6H5CI
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13. The SI unit of Molar heat capacity is :

6. Match the following :
(a) JK–1mol–1 (b) kJ mol+1
Compound Uses
(c) kJ mol–1 (d) cm
(1) Chloro picrin (i) Detection of
.s

primary amine 14. What percentage of solution of H2O2 is called as

(2) Methyl Isocyanide (ii) DDT "100–Volume" H2O2 ?
(3) Chloro benzene (iii) Paint remover (a) 15% (b) 50%
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(4) Methylene Chloride (iv) Soil sterilizer (c) 20% (d) 30%
(a) (1) – (iv), (2) – (iii), (3) – (ii), (4) – (i) 15. Osmotic pressure (π) of a solution is given by the
(b) (1) – (iii), (2) – (iv), (3) – (ii), (4) – (i) relation :
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(c) (1) – (i), (2) – (ii), (3) – (iv), (4) – (iii) (a) πRT = n (b) V = πnRT
(d) (1) – (iv), (2) – (i), (3) – (ii), (4) – (iii) (c) π = nRT (d) πV = nRT
7. Use of hot air balloon in meteorological observatory is
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an application of :
(a) Kelvin's Law (b) Brown's Law
(c) Boyle's Law (d) Newton's Law

[1]
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2_____________________________________________ Sura’s  Chemistry  XI Std - Public Examination – March 2019

PART - II (b) (i) State and explain Dobereiner's "Triad".

Answer any six of the following questions. (ii) Complete the following equation
Question No. 24 is compulsory.  (6 × 2 = 12) Na2O2 + ? → Na2SO4 + H2O2
16. State and explain Pauli's Exclusion Principle. 35. (a) (i) A
 mong the alkaline earth metals BeO is
insoluble in water but other oxides are
17. Define – Valency.

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soluble. Why?
18. What are ideal gases? (ii) State Diffusion Law.
19. State the third law of Thermodynamics.
OR

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20. What is called Bond Length? Name the techniques (b) (i) Calculate the entropy change during the
through which the length of a bond can be determined. melting of one mole of ice into water at 0°C.
21. Describe the reaction involved in the detection of Enthalpy of fusion of ice is 6008 J mol–1.
Nitrogen in an organic compound by Lassaigne (ii) Write the Balance chemical equation for the
Method. [CaO(s)] [CO2(g)]

s.
22. How is Alkane prepared from Grignard reagent? Kc =
[CaCO(s)]
23. Define – Acid rain.
36. (a) (i) NH3 and HCl do not obey Henry's law. Why?

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24. Which is the suitable method for detection of Nitrogen
(ii) Write the structure of the following
present in food and fertilizers?
compounds.
(A) NH3 (B) BF3
PART - III
Answer any six of the following questions. OR
Question No. 33 is compulsory.  (6 × 3 = 18)
o (b) (i) I dentify the cis and trans isomers for the
25. Calculate the equivalent mass of H2SO4. following compounds.
ab
26. Explain diagonal relationship. H H
27. How is Tritium prepared? (A) C=C
28. Define – Le–Chatelier principle. H3C CH3
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29. State the term "Isotonic solution".

H H
30. Both C2H2 and CO2 have the same structure. Explain (B)
why. C=C
.s

H3C CH3
31. Write note on Williamson's Synthesis.
32. Explain why Ca(OH)2 is used in white washing. (ii) E
 xplain with example the Positive
Mesomeric Effect.
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33. Give the structural formula for the following

compounds. 37. (a) (i) Write the IUPAC name for the following
(a) m – dinitrobenzene compound
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(b) p – dichlorobenzene (A) CH3 – CH – CH2 – CH3

(c) 1,3,5 Tri–methyl Benzene
CH3
CH3
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PART - IV
Answer all five questions : (5 × 5 = 25) (B) H3C – C – CH3
34. (a) (i) Calculate oxidation number of oxygen in CH3
H2O2.
(ii) What are Nucleophiles and Electrophiles?
(ii) Write the de–Broglie eqution. Give one example each.
OR OR
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Sura’s  Chemistry  XI Std - Public Examination – March 2019 �������������������������������������������� 3

(b) (i) H
 ow will you get the following products PART - II
with the given reactants? 16. Pauli's exclusion principle states that "No two
(A) Acetylene → Benzene electrons in an atom can have the same set of values
(B) Phenol → Benzene of all four quantum numbers. H(Z = 1) 1s–1.
(C) Benzene → Toluene one electron is present in hydrogen atom, the four

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(ii) Write any two different components you get quantum numbers are: n = 1; l = 0; m = 0 and s = +½.
during fractional distillation of Coal Tar at For helium Z = 2. He : 1s2
any two different temperature. In this one electron has the quantum number. Same
as that of hydrogen n = 1, l = 0, m = 0 and s = –½.

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38. (a) (i) A Compound having the empirical formula
For other quantum number is different i.e., n = 1,
C6H6O has the vapuor density 47. Find its
l = 0, m = 0 and s = –½.
Molecular formula.
(ii) The Simple Aromatic Hydrocarbon 17. Define valency of an element may be defined as the
compound (A) reacts with Bromine to give combining capacities of elements. The electrons

s.
(B). Compound (A) reacts with Raney Ni present in the outermost shell are called valence
and gives (C). Identify (A), (B) and (C). electrons and these electrons determine the valency of
OR the atom.

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(b) (i) C(s) + O2(g) → CO2(g) 18. An ideal gas is defined as one in which all collisions
between atoms or molecules are perfectly eleastic and
 alculate the standard entropy change for the
C
in which there are no intermolecular attractive forces.
above reaction, given the standard entropies
An ideal gas is a gas that obeys the ideal gas law,
of CO2(g), C(s), O2(g) are 213.6, 5.740 and 205
PV = nRT, where n is the number of moles of the gas,
JK–1 respectively.
o R is the ideal gas constant,pressure P, volume V, and
(ii) Identify the compound (A) and (B) temperature T.
ab
H2O/H+ H2O/H+ 19. (i) The third law of thermodynamics states that
R– C ≡ N (A) (B).
the entropy of pure crystalline substance at
 absolute zero is zero.
ANSWERS (ii) It can also be stated as it is impossible to lower
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the temperature of an object to absolute zero

PART - I in a finite number of steps.
1. (c) Covalent nature (iii) Mathematically,
2. (a) Kp < Kc lim S = 0 for a perfectly ordered crystalline
.s

T→0
3. (a) CaC2
state.
4. (d) Shielding effect
20. The distance between the nuclei of the two covalently
5. (b) C6H5NH3 bonded atoms is called bond length.
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6. (d) (1) – (iv), (2) – (i), (3) – (ii), (4) – (iii) The length of a bond can be determined by
7. (c) Boyle's Law spectroscopic, x-ray diffraction and electron-
diffraction techniques
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8. (a) 5.6
9. (d) CaF2 21. Na + C
 +
 N 
 → NaCN
10. (a) Argon from organic compounds
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11. (b) H2O

FeSO 4 + 2 NaOH  → Fe (OH )2 + Na 2SO 4
12. (c) Propene (from excess of sodium)
13. (a) JK–1mol–1
14. (d) 30%
15. (d) πV = nRT

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4_____________________________________________ Sura’s  Chemistry  XI Std - Public Examination – March 2019

27. (i) By bombarding lithium with slow neutrons

6 NaCN + Fe (OH )2 
→ Na 4  Fe (CN )6  + 2 NaOH
Sod.ferrocyanide
(ii) 3Li6 + 0n1 → 1T3 + 2He4
28. It states that “If a system at equilibrium is disturbed,
3Na 4  Fe (CN )6  + 4FeCl3 
→ Fe 4  Fe (CN )6  + 12 NaCl
3 then the system shifts itself in a direction that nullfiies
ferric ferrocyanide Prussian
blue or green ppt the effect of that disturbance.”

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29. (i) Two solutions having same osmotic pressure at a
22. CH3 MgI + HO − H  → CH 4 + MgI (OH ) given temperature are called isotonic solutions.
( or ) (ii) When such solutions are separated by a
∆
CH3 MgI + C2 H5OH → CH 4 + MgI (OC2 H5 ) semipermeable membrane, solvent flow

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Ethyl alcohol methane between one to the other on either direction is
23. Rain water normally has a pH of 5.6 due to dissolution same, i.e. the net solvent flow between the two
of atmospheric CO2 into it. Oxides of sulphur isotonic solutions is zero.
and nitrogen in the atmosphere may be absorbed 30.

s.
by droplets of water that make up clouds and get Molecule concept Geometry
chemically converted into sulphuric acid and nitric
C2H2 Hybridisation (sp) Linear
acid respectively as a results of pH of rain water drops
CO2 VSEPR (AB2) Linear

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to the level 5.6, hence it is called acid rain.
24. Kjeldahls method : This method is carried much more 31. Williamson's synthesis : Halo alkanes when boiled
easily than the Dumas method. It is used largely in with sodium alkoxide gives the corresponding other.
the analysis of foods and fertilizers. Kjeldahls method CH3 – CH2Br + CH3 CH2 ONa CH3 – CH2– O – CH2 – CH3 + NaBr
is based on the fact that when an organic compound Bromo Sodium Diethyl ether
o
containing nitrogen is heated with conc. H2SO4, the ethane ethoxide

nitrogen in it is quantitatively converted to ammonium 32. White wash due to its disinfectant nature.
ab
sulphate. 33. NO 2 Cl CH 3

PART - III 33 44

44 22 33 55
25. H2SO4 basicity = 2eq mol–1
Molar mass of H2SO4 = (2 × 1) + (1 × 32) + 55
11
22 66
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(4 × 16) 66
NO 2 11 H 3C CH 3
1,3,5-trimethylbenzene
= 98 g mol–1 1,3-dinitrobenzene
(i)
Cl (iii)
p-dichloro benzene
98 (ii)
Gram equivalent of H2SO4 =
2
.s

PART - IV
= 49 g eq–1
26. On moving diagonally across the periodic table, 34. a (i) hydrogen peroxide (H2O2)
the second and third period elements show certain 2 (+ 1) + 2x = 0; ⇒ 2x = –2 ; ⇒ x = –1
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similarities. It is quite pronounced in the following (ii) � de-Broglie combined the following two
pair of 1elements.
Group Group 2 Group 13 Group 14 equations of energy of which one represents
wave character (hυ) and the other represents
Li Be B C
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the particle nature (mc2).

(i) Planck’s quantum hypothesis : E = hν
Na Mg Al Si
(ii) Einsteins mass-energy relationship :
The similarity in properties existing between the
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E = mc2
diagonally placed elements is called ‘diagonal
From (i) and (ii)
relationship’.
hν = mc2
hc/λ = mc2
λ = h / mc

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Sura’s  Chemistry  XI Std - Public Examination – March 2019 �������������������������������������������� 5
� The equation represents the wavelength of λ = h / mv
photons whose momentum is given by mc � This is valid only when the particle travels at
(Photons have zero rest mass) speeds much less than the speed of light.
� For a particle of matter with mass m and moving (or)
with a velocity v, the equation can be written as
34. b (i) some elements such as chlorine, bromine and iodine with similar chemical properties into the group of three

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elements called as triads. In triads, the atomic weight of the middle element nearly equal to the arithmetic mean
of the atomic weights of the remaining two elements. Any one example
S. No. Elements in the Atomic weight of Average atomic weight of the

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Triad middle element remaining elements
1 Li, Na, K 23 7 + 39
= 23
2
2 Cl, Br, I 80

s.
35.5 + 127
= 81.25
2
3 Ca, Sr, Ba 88 40 + 137

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= 88.5
2

(ii) Na2O2 + H2SO4 → Na2SO4 + H2O

35. a (i) BeO is amphoteric, BeO oxide is covalent due to (iii) The gases reacting with the solvent do not obey
o
the small size of Be2+ ion. So BeO insoluble in Henry’s law. For example, ammonia or HCl
water reacts with water and hence does not obey this
ab
(ii) When two non-reactive gases are allowed to mix, law.
the gas molecules migrate from region of higher NH3+ H2O  NH+4 + OH–
concentration to a region of lower concentration. (iv) The gases obeying Henry’s law should not
This property of gas which involves the movement associate or dissociate while dissolving in the
of the gas molecules through another gases is
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solvent.
called diffusion. (ii) (a) A= N atom; B= H atoms
A
(or)
B B
b (i) H 2 O (S) 273
K
→ H 2 O (l )
.s

∆H fusion B
∆Sfusion = pyramidal
Tf
(b) B A= B atom; B= F atoms
6008
=
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273 A
1200

∆S fusion = 22 .007 J K −1 mole −1

B B
 Trigonal planar
(ii) CaCO3 (s)  CaO(s) + CO 2 (g )
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(or)
(or)
b (i) H H H CH3
36. a (i) 
C C C C
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(i) Henry’s law is applicable at moderate

temperature and pressure only. H3C CH3 H 3C H
(ii) Only the less soluble gases obeys Henry’s law Cis -2-butene Trans 2-butene

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6_____________________________________________ Sura’s  Chemistry  XI Std - Public Examination – March 2019

(ii) Positive resonance effect occurs, when the electrons move away from substituent attached to the conjugated
system. It occurs, if the electron releasing substituents are attached to the conjugated system.
In such cases, the attached group has a tendency to release electrons through resonance. These electron releasing
groups are usually denoted as +R or +M groups.
Examples : –OH, –SH, –OR, –SR, –NH2, –O–

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37. (a)
(i) IUPAC names
(a) 2- methylbutane
(b) 2,2-dimethylpropane

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(ii) Nucleophiles are reagents that have high affinity for electro positive centers.
(any two examples)
Types Examples Electron rich site
Ammonia (NH3) and amines (RNH2) N:

s.
Neutral molecules having Water (H2O), alcohols (ROH) and ethers (R-O-R) :O:
unshared pair of electron
Hydrogen sulphide (H2S) and thiols (RSH) :S:

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Chlorides (Cl–), bromides (Br–) and iodides (I–) X–
Negatively charged Hydroxide (HO– ), alkoxide (RO–) and Carboxlate ions O–
nucleophiles (RCOO–)
Cyanide (CN–) N–
o
Electrophiles are reagents that are attracted towards negative charge or electron rich center. (any two examples)
ab
Types Examples Electron rich site
Carbon dioxide (CO2), dichlorocarbene (:CCl2) C
Neutral electrophiles Aluminium chloride (AlCl3), boron trifluoride Metal (M)
(BF3) and ferric chloride (FeCl3)
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Carbocations (R+) C+
Proton (H+) H+
Positively charged
Alkyl halides (RX) X+
electrophiles
.s

Oxonium ion (H3O+) and nitrosonium ion (NO+) O+

Nitronium ion (+NO2) N+
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(or)
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Sura’s  Chemistry  XI Std - Public Examination – March 2019 �������������������������������������������� 7

(b) (i)  38. (a) (i)

Empirical Formula = C6H6O
(a) 3 CH CH
Red Hot Iron tube Molar mass
n =
873 K Calculated empirical formula mass
Benzene 2 × vapour density 2 × 47
= = =1

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(b) C6 H5OH + Zn 
→ C6 H 6 + ZnO 94 94
Phenol Benzenee molecular formula (C6H6O) × 1 = C6H6O
anhydrous AlCl3 (ii) C6 H 6 + Br2 FeBr
 3 → C H Br
(c) C6 H 6 + CH3Cl → C6 H5CH3 + HCl 6 5

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Benzene chloromethane toluene (A) (B)
anhydrous AlCl
3
 C6 H 6 + CH3Cl  → C6 H5CH3 + HCl
Raney Ni
Benzene chloromethane toluene C6 H 6 + 3H 2 
→ C6 H12 + HBr
(ii) A-Benzene; B-Bromo benzene; C-Cyclohexane

s.
Name of the Temperature Name of the (or)
Fraction Range Compenents (b) (i) 
1. Crude 350 - 443 K Benzene, Toluene, C (g ) + O 2 (g ) 
→ CO 2 (g )

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light oil Xylenes
2. Middle oil 443 - 503 K Phenol, ∆S0r = ∑ S0products − ∑ S0reactants

3. Heavy oil 503 - 543 K

Naphthalene
Naphthalene,
{
∆S0r = SCO
0
2 } {
− SC0 + SO
0
2 }
Cresol ∆S0r = 213.6 − [5.74 + 205]
4. Green oil 543 - 633 K Anthracene
o ∆S0r = 213.6 − [ 210.74]
ab
5. Pitch Alone 633 K Residue ∆S0r = 2.86 JK −1

(ii)
H 2O / H + H 2O / H +
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R − C ≡  → RCONH 2  → RCOOH

(A) (B)

.s


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w
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8_____________________________________________ Sura’s  Chemistry  XI Std - Public Examination – March 2019

NOTES

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co
s.
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ab
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.s
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