Class 11 Chemistry: CBSE Sample Question Papers - 2 (2023-24) | Sample Papers for Class 11 Medical and Non-Medical - JEE PDF Download

 Page 1


Time Allowed: 3 hours Maximum Marks: 70 
General Instructions:
1. There are 33 questions in this question paper with internal choice.
2. SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
3. SECTION B consists of 5 very short answer questions carrying 2 marks each.
4. SECTION C consists of 7 short answer questions carrying 3 marks each.
5. SECTION D consists of 2 case-based questions carrying 4 marks each.
6. SECTION E consists of 3 long answer questions carrying 5 marks each.
7. All questions are compulsory.
8. The use of log tables and calculators is not allowed
Section A
a) All of these b) Each access of people to the food grain
c) Increased production and storage of food
grains
d) People should have money to purchase the
grains
1. To solve the food problem of the country, which along the following is necessary? [1]
a) absorbing selected wavelengths and
returning to normal ground state
b) absorbing selected wavelengths from an
input of continuous spectrum
c) absorbing all wavelengths and returning to
normal ground state
d) absorbing all wavelengths from an input of
continuous spectrum
2. Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for the given material results from
the material's (atom or molecules):
[1]
a) = b) > 
c) d) = 0
3. of combustion of methane is -X kJ . The value of  is [1] ? U ? m o l - 1 ? H ? ? U ? ? U ? <   ? U ? a)
5.72 10
-18
J atom
-1 b)
3.72 10
-18
J atom
-1
c)
8.72 10
-18
J atom
-1 d)
7.72 10
-18
J atom
-1
4. Calculate the energy required for the process  (Hint: The ionization energy of
the lowest state, also called the ground state is 2.18  10
-18
J atom
-1
)?
[1] H ( g )   ?   H ( g )   +   e + e 2 + e _ . × × × × × 5. Which of the following properties is the measure of the degree of randomness or disorder in the system? [1]
Page 1 of 13
Page 2


Time Allowed: 3 hours Maximum Marks: 70 
General Instructions:
1. There are 33 questions in this question paper with internal choice.
2. SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
3. SECTION B consists of 5 very short answer questions carrying 2 marks each.
4. SECTION C consists of 7 short answer questions carrying 3 marks each.
5. SECTION D consists of 2 case-based questions carrying 4 marks each.
6. SECTION E consists of 3 long answer questions carrying 5 marks each.
7. All questions are compulsory.
8. The use of log tables and calculators is not allowed
Section A
a) All of these b) Each access of people to the food grain
c) Increased production and storage of food
grains
d) People should have money to purchase the
grains
1. To solve the food problem of the country, which along the following is necessary? [1]
a) absorbing selected wavelengths and
returning to normal ground state
b) absorbing selected wavelengths from an
input of continuous spectrum
c) absorbing all wavelengths and returning to
normal ground state
d) absorbing all wavelengths from an input of
continuous spectrum
2. Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for the given material results from
the material's (atom or molecules):
[1]
a) = b) > 
c) d) = 0
3. of combustion of methane is -X kJ . The value of  is [1] ? U ? m o l - 1 ? H ? ? U ? ? U ? <   ? U ? a)
5.72 10
-18
J atom
-1 b)
3.72 10
-18
J atom
-1
c)
8.72 10
-18
J atom
-1 d)
7.72 10
-18
J atom
-1
4. Calculate the energy required for the process  (Hint: The ionization energy of
the lowest state, also called the ground state is 2.18  10
-18
J atom
-1
)?
[1] H ( g )   ?   H ( g )   +   e + e 2 + e _ . × × × × × 5. Which of the following properties is the measure of the degree of randomness or disorder in the system? [1]
Page 1 of 13
a) Entropy b) Gibbs free energy
c) Internal energy d) Enthalpy
a) 3p b) 3d
c) 3s d) 3f
6. The orbital with n = 3 and l = 2 is [1]
a) across the third period in the periodic table. b) the first three groups.
c) in the atoms of transition elements. d) In alkaline earth metals.
7. The highest value of oxidation number changes from 1 to 7 is: [1]
a) Nucleophiles are not electron seeking. b) Nucleophiles attack low electron density
sites.
c) Ammonia is a nucleophile. d) Nucleophile is a Lewis acid.
8. Which of the following statements is not correct for a nucleophile? [1]
a) F
3
C - CH = CH
2
b) CH
3
O - CH = CH
2
c) Cl - CH = CH
2
d) H
2
N - CH = CH
2
9. Which one of the following alkenes when treated with HCl yields majorly an anti-Markownikov product? [1]
a) Na > O > F b) O > F > Na
c) O > Na > F d) F > O > Na
10. The correct order of electronegativity of Na, O and F is [1]
a) The boundaries permit the flow of matter
into it but not vice versa.
b) The boundaries permit the flow of matter
into or out of it.
c) The boundaries prevent the flow of matter
into or out of it.
d) The boundaries prevent the flow of matter
out of it but not vice versa.
11. In a closed system, which of the following take place? [1]
a) CH
3
CH(OH) = CH
2
b) CH
3
 - C(CH
2
OH) = CH
2
c) CH
3
 - CH = CH - OH d) HO - CH
2
 - CH = CH
2
12. Vinylcarbinol is: [1]
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
13. Assertion (A): Components of a mixture of red and blue inks can be separated by distributing the components
between stationary and mobile phases in paper chromatography. 
Reason (R): The coloured components of inks migrate at different rates because paper selectively retains
different components according to the difference in their partition between the two phases.
[1]
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
14. Assertion (A): Buta-1, 3-diene and but-1-yne can be distinguished with Tollen's reagent. 
Reason (R): But-1-dyne gives ppt. with Tollen's reagent but buta-1, 3-diene does not.
[1]
Page 2 of 13
Page 3


Time Allowed: 3 hours Maximum Marks: 70 
General Instructions:
1. There are 33 questions in this question paper with internal choice.
2. SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
3. SECTION B consists of 5 very short answer questions carrying 2 marks each.
4. SECTION C consists of 7 short answer questions carrying 3 marks each.
5. SECTION D consists of 2 case-based questions carrying 4 marks each.
6. SECTION E consists of 3 long answer questions carrying 5 marks each.
7. All questions are compulsory.
8. The use of log tables and calculators is not allowed
Section A
a) All of these b) Each access of people to the food grain
c) Increased production and storage of food
grains
d) People should have money to purchase the
grains
1. To solve the food problem of the country, which along the following is necessary? [1]
a) absorbing selected wavelengths and
returning to normal ground state
b) absorbing selected wavelengths from an
input of continuous spectrum
c) absorbing all wavelengths and returning to
normal ground state
d) absorbing all wavelengths from an input of
continuous spectrum
2. Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for the given material results from
the material's (atom or molecules):
[1]
a) = b) > 
c) d) = 0
3. of combustion of methane is -X kJ . The value of  is [1] ? U ? m o l - 1 ? H ? ? U ? ? U ? <   ? U ? a)
5.72 10
-18
J atom
-1 b)
3.72 10
-18
J atom
-1
c)
8.72 10
-18
J atom
-1 d)
7.72 10
-18
J atom
-1
4. Calculate the energy required for the process  (Hint: The ionization energy of
the lowest state, also called the ground state is 2.18  10
-18
J atom
-1
)?
[1] H ( g )   ?   H ( g )   +   e + e 2 + e _ . × × × × × 5. Which of the following properties is the measure of the degree of randomness or disorder in the system? [1]
Page 1 of 13
a) Entropy b) Gibbs free energy
c) Internal energy d) Enthalpy
a) 3p b) 3d
c) 3s d) 3f
6. The orbital with n = 3 and l = 2 is [1]
a) across the third period in the periodic table. b) the first three groups.
c) in the atoms of transition elements. d) In alkaline earth metals.
7. The highest value of oxidation number changes from 1 to 7 is: [1]
a) Nucleophiles are not electron seeking. b) Nucleophiles attack low electron density
sites.
c) Ammonia is a nucleophile. d) Nucleophile is a Lewis acid.
8. Which of the following statements is not correct for a nucleophile? [1]
a) F
3
C - CH = CH
2
b) CH
3
O - CH = CH
2
c) Cl - CH = CH
2
d) H
2
N - CH = CH
2
9. Which one of the following alkenes when treated with HCl yields majorly an anti-Markownikov product? [1]
a) Na > O > F b) O > F > Na
c) O > Na > F d) F > O > Na
10. The correct order of electronegativity of Na, O and F is [1]
a) The boundaries permit the flow of matter
into it but not vice versa.
b) The boundaries permit the flow of matter
into or out of it.
c) The boundaries prevent the flow of matter
into or out of it.
d) The boundaries prevent the flow of matter
out of it but not vice versa.
11. In a closed system, which of the following take place? [1]
a) CH
3
CH(OH) = CH
2
b) CH
3
 - C(CH
2
OH) = CH
2
c) CH
3
 - CH = CH - OH d) HO - CH
2
 - CH = CH
2
12. Vinylcarbinol is: [1]
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
13. Assertion (A): Components of a mixture of red and blue inks can be separated by distributing the components
between stationary and mobile phases in paper chromatography. 
Reason (R): The coloured components of inks migrate at different rates because paper selectively retains
different components according to the difference in their partition between the two phases.
[1]
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
14. Assertion (A): Buta-1, 3-diene and but-1-yne can be distinguished with Tollen's reagent. 
Reason (R): But-1-dyne gives ppt. with Tollen's reagent but buta-1, 3-diene does not.
[1]
Page 2 of 13
Section B
Section C
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
15. Assertion (A): Ten distinct set of four quantum numbers are possible for d-subshell. 
Reason (R): d-subshell splits into five orbitals.
[1]
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
16. Assertion (A): S.I. unit of atomic mass and molecular mass is kg. 
Reason (R): It is equal to the mass of 6.023  10
23
 atoms.
[1]
× 17. What is meant by conjugate acid base pair? Find the conjugate acid/ base for the following species: 
HNO
2
, CN
-
, HClO
4
, F
-
, OH
-
,  S
2-
[2]
C , O 2 - 3 18. Write the name and atomic number of the following elements.
i. The third alkali metal
ii. The fourth alkaline earth metal
iii. The sixth element of second transition series
iv. The second inner transition element
v. The fifth noble gas.
[2]
19. Calculate the concentration of nitric acid in moles per litre in a sample which has a density 1.41 g mL
-1 
and the
mass per cent of nitric acid in it is being 69%.
[2]
20. How is phenol reduced to benzene? [2]
OR
Convert:
i. Propene to 2, 3-dimethyl butane
ii. Ethane to ethyne
21. Calculate (a) wavenumber and (b) frequency of yellow radiation having wavelength 5800 .
[2]
A o 22. Interpret the non-linear shape of H
2
S molecule and non-planar shape of PCI
3
 using valence shell electron pair
repulsion (VSEPR) theory.
[3]
23. Answer: [3]
Define reaction enthalpy. [1] (i)
Define standard enthalpy. [1] (ii)
Define intensive properties. [1] (iii)
24. How will you calculate work done on an ideal gas in a compression, when the change in pressure is carried out
in infinite steps?
[3]
25. Write correctly the balanced equations for the following redox reactions using half-reactions. [3]
Page 3 of 13
Page 4


Time Allowed: 3 hours Maximum Marks: 70 
General Instructions:
1. There are 33 questions in this question paper with internal choice.
2. SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
3. SECTION B consists of 5 very short answer questions carrying 2 marks each.
4. SECTION C consists of 7 short answer questions carrying 3 marks each.
5. SECTION D consists of 2 case-based questions carrying 4 marks each.
6. SECTION E consists of 3 long answer questions carrying 5 marks each.
7. All questions are compulsory.
8. The use of log tables and calculators is not allowed
Section A
a) All of these b) Each access of people to the food grain
c) Increased production and storage of food
grains
d) People should have money to purchase the
grains
1. To solve the food problem of the country, which along the following is necessary? [1]
a) absorbing selected wavelengths and
returning to normal ground state
b) absorbing selected wavelengths from an
input of continuous spectrum
c) absorbing all wavelengths and returning to
normal ground state
d) absorbing all wavelengths from an input of
continuous spectrum
2. Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for the given material results from
the material's (atom or molecules):
[1]
a) = b) > 
c) d) = 0
3. of combustion of methane is -X kJ . The value of  is [1] ? U ? m o l - 1 ? H ? ? U ? ? U ? <   ? U ? a)
5.72 10
-18
J atom
-1 b)
3.72 10
-18
J atom
-1
c)
8.72 10
-18
J atom
-1 d)
7.72 10
-18
J atom
-1
4. Calculate the energy required for the process  (Hint: The ionization energy of
the lowest state, also called the ground state is 2.18  10
-18
J atom
-1
)?
[1] H ( g )   ?   H ( g )   +   e + e 2 + e _ . × × × × × 5. Which of the following properties is the measure of the degree of randomness or disorder in the system? [1]
Page 1 of 13
a) Entropy b) Gibbs free energy
c) Internal energy d) Enthalpy
a) 3p b) 3d
c) 3s d) 3f
6. The orbital with n = 3 and l = 2 is [1]
a) across the third period in the periodic table. b) the first three groups.
c) in the atoms of transition elements. d) In alkaline earth metals.
7. The highest value of oxidation number changes from 1 to 7 is: [1]
a) Nucleophiles are not electron seeking. b) Nucleophiles attack low electron density
sites.
c) Ammonia is a nucleophile. d) Nucleophile is a Lewis acid.
8. Which of the following statements is not correct for a nucleophile? [1]
a) F
3
C - CH = CH
2
b) CH
3
O - CH = CH
2
c) Cl - CH = CH
2
d) H
2
N - CH = CH
2
9. Which one of the following alkenes when treated with HCl yields majorly an anti-Markownikov product? [1]
a) Na > O > F b) O > F > Na
c) O > Na > F d) F > O > Na
10. The correct order of electronegativity of Na, O and F is [1]
a) The boundaries permit the flow of matter
into it but not vice versa.
b) The boundaries permit the flow of matter
into or out of it.
c) The boundaries prevent the flow of matter
into or out of it.
d) The boundaries prevent the flow of matter
out of it but not vice versa.
11. In a closed system, which of the following take place? [1]
a) CH
3
CH(OH) = CH
2
b) CH
3
 - C(CH
2
OH) = CH
2
c) CH
3
 - CH = CH - OH d) HO - CH
2
 - CH = CH
2
12. Vinylcarbinol is: [1]
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
13. Assertion (A): Components of a mixture of red and blue inks can be separated by distributing the components
between stationary and mobile phases in paper chromatography. 
Reason (R): The coloured components of inks migrate at different rates because paper selectively retains
different components according to the difference in their partition between the two phases.
[1]
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
14. Assertion (A): Buta-1, 3-diene and but-1-yne can be distinguished with Tollen's reagent. 
Reason (R): But-1-dyne gives ppt. with Tollen's reagent but buta-1, 3-diene does not.
[1]
Page 2 of 13
Section B
Section C
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
15. Assertion (A): Ten distinct set of four quantum numbers are possible for d-subshell. 
Reason (R): d-subshell splits into five orbitals.
[1]
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
16. Assertion (A): S.I. unit of atomic mass and molecular mass is kg. 
Reason (R): It is equal to the mass of 6.023  10
23
 atoms.
[1]
× 17. What is meant by conjugate acid base pair? Find the conjugate acid/ base for the following species: 
HNO
2
, CN
-
, HClO
4
, F
-
, OH
-
,  S
2-
[2]
C , O 2 - 3 18. Write the name and atomic number of the following elements.
i. The third alkali metal
ii. The fourth alkaline earth metal
iii. The sixth element of second transition series
iv. The second inner transition element
v. The fifth noble gas.
[2]
19. Calculate the concentration of nitric acid in moles per litre in a sample which has a density 1.41 g mL
-1 
and the
mass per cent of nitric acid in it is being 69%.
[2]
20. How is phenol reduced to benzene? [2]
OR
Convert:
i. Propene to 2, 3-dimethyl butane
ii. Ethane to ethyne
21. Calculate (a) wavenumber and (b) frequency of yellow radiation having wavelength 5800 .
[2]
A o 22. Interpret the non-linear shape of H
2
S molecule and non-planar shape of PCI
3
 using valence shell electron pair
repulsion (VSEPR) theory.
[3]
23. Answer: [3]
Define reaction enthalpy. [1] (i)
Define standard enthalpy. [1] (ii)
Define intensive properties. [1] (iii)
24. How will you calculate work done on an ideal gas in a compression, when the change in pressure is carried out
in infinite steps?
[3]
25. Write correctly the balanced equations for the following redox reactions using half-reactions. [3]
Page 3 of 13
Section D
i. H
2
S + Fe
3+
  Fe
2+
 + S + H
+
ii. I
-
 +  + H
+
  I
2
 + H
2
O
iii. Bi(s) +  + H
+
  NO
2
 + Bi
3+
 + H
2
O 
State what is oxidised to what and what is reduced to what in the reactions expressed by the equations?
? I 0 - 3 ? N O - 3 ? 26. The electronic energy in hydrogen atom is given by E
n
 = (-2.18  10
-18
)/n
2
J.Calculate the energy required to
remove an electron completely from the n = 2 orbit. What is the longest wavelength of light in cm that can be
used to cause this transition?
[3]
× 27. The outer electronic configurations of some elements are:
i. 3s
2 
3p
4
ii. 3d
10
 4s
2
iii. 3s
2
 3p
6
 4s
2
iv. 6s
2
 4f
3
State to which block in the periodic table each of these elements belong.
[3]
28. Two oxides of a metal contain 27.6% and 30.0% of oxygen respectively. If the formula of the first oxide is
M
3
O
4
, find that of the second.
[3]
29. Read the text carefully and answer the questions:
The phenomenon of the existence of two or more compounds possessing the same molecular formula but
different properties is known as isomerism. Such compounds are called isomers. Compounds having the same
molecular formula but different structures (manners in which atoms are linked) are classified as structural
isomers. Structural isomers are classified as chain isomer, position isomer, functional group isomer.
Meristematic arises due to different alkyl chains on either side of the functional group in the molecule and
stereoisomerism and can be classified as geometrical and optical isomerism. Hyperconjugation is a general
stabilising interaction. It involves delocalisation of s electrons of the C-H bond of an alkyl group directly
attached to an atom of an unsaturated system or to an atom with an unshared p orbital. This type of overlap
stabilises the carbocation because electron density from the adjacent s bond helps in dispersing the positive
charge.
[4]
OR
Why Isopentane, pentane and Neopentane are chain isomers? (i)
Why hyperconjugation is a permanent effect?
The molecular formula C
3
H
8
O represents which isomer? (ii)
What type of isomerism is shown by Methoxypropane and ethoxyethane? (iii)
30. Read the text carefully and answer the questions:
In order to explain the characteristic geometrical shapes of polyatomic molecules, Pauling introduced the
concept of hybridisation. The orbitals undergoing hybridisation should have nearly the same energy. There are
various type of hybridisations involving s, p and d-type of orbitals. The type of hybridisation gives the
characteristic shape of the molecule or ion.
[4]
Why all the orbitals in a set of hybridised orbitals have the same shape and energy? (i)
Out of XeF
2
 and SF
2
 which molecule has the same shape as  ion? (ii) N O + 2 Out of XeF
4
 and XeF
2
 which molecule doesn't have the same type of hybridisation as P(Phosphorus) has (iii)
Page 4 of 13
Page 5


Time Allowed: 3 hours Maximum Marks: 70 
General Instructions:
1. There are 33 questions in this question paper with internal choice.
2. SECTION A consists of 16 multiple-choice questions carrying 1 mark each.
3. SECTION B consists of 5 very short answer questions carrying 2 marks each.
4. SECTION C consists of 7 short answer questions carrying 3 marks each.
5. SECTION D consists of 2 case-based questions carrying 4 marks each.
6. SECTION E consists of 3 long answer questions carrying 5 marks each.
7. All questions are compulsory.
8. The use of log tables and calculators is not allowed
Section A
a) All of these b) Each access of people to the food grain
c) Increased production and storage of food
grains
d) People should have money to purchase the
grains
1. To solve the food problem of the country, which along the following is necessary? [1]
a) absorbing selected wavelengths and
returning to normal ground state
b) absorbing selected wavelengths from an
input of continuous spectrum
c) absorbing all wavelengths and returning to
normal ground state
d) absorbing all wavelengths from an input of
continuous spectrum
2. Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for the given material results from
the material's (atom or molecules):
[1]
a) = b) > 
c) d) = 0
3. of combustion of methane is -X kJ . The value of  is [1] ? U ? m o l - 1 ? H ? ? U ? ? U ? <   ? U ? a)
5.72 10
-18
J atom
-1 b)
3.72 10
-18
J atom
-1
c)
8.72 10
-18
J atom
-1 d)
7.72 10
-18
J atom
-1
4. Calculate the energy required for the process  (Hint: The ionization energy of
the lowest state, also called the ground state is 2.18  10
-18
J atom
-1
)?
[1] H ( g )   ?   H ( g )   +   e + e 2 + e _ . × × × × × 5. Which of the following properties is the measure of the degree of randomness or disorder in the system? [1]
Page 1 of 13
a) Entropy b) Gibbs free energy
c) Internal energy d) Enthalpy
a) 3p b) 3d
c) 3s d) 3f
6. The orbital with n = 3 and l = 2 is [1]
a) across the third period in the periodic table. b) the first three groups.
c) in the atoms of transition elements. d) In alkaline earth metals.
7. The highest value of oxidation number changes from 1 to 7 is: [1]
a) Nucleophiles are not electron seeking. b) Nucleophiles attack low electron density
sites.
c) Ammonia is a nucleophile. d) Nucleophile is a Lewis acid.
8. Which of the following statements is not correct for a nucleophile? [1]
a) F
3
C - CH = CH
2
b) CH
3
O - CH = CH
2
c) Cl - CH = CH
2
d) H
2
N - CH = CH
2
9. Which one of the following alkenes when treated with HCl yields majorly an anti-Markownikov product? [1]
a) Na > O > F b) O > F > Na
c) O > Na > F d) F > O > Na
10. The correct order of electronegativity of Na, O and F is [1]
a) The boundaries permit the flow of matter
into it but not vice versa.
b) The boundaries permit the flow of matter
into or out of it.
c) The boundaries prevent the flow of matter
into or out of it.
d) The boundaries prevent the flow of matter
out of it but not vice versa.
11. In a closed system, which of the following take place? [1]
a) CH
3
CH(OH) = CH
2
b) CH
3
 - C(CH
2
OH) = CH
2
c) CH
3
 - CH = CH - OH d) HO - CH
2
 - CH = CH
2
12. Vinylcarbinol is: [1]
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
13. Assertion (A): Components of a mixture of red and blue inks can be separated by distributing the components
between stationary and mobile phases in paper chromatography. 
Reason (R): The coloured components of inks migrate at different rates because paper selectively retains
different components according to the difference in their partition between the two phases.
[1]
a) Both A and R are true and R is the correct b) Both A and R are true but R is not the
14. Assertion (A): Buta-1, 3-diene and but-1-yne can be distinguished with Tollen's reagent. 
Reason (R): But-1-dyne gives ppt. with Tollen's reagent but buta-1, 3-diene does not.
[1]
Page 2 of 13
Section B
Section C
explanation of A. correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
15. Assertion (A): Ten distinct set of four quantum numbers are possible for d-subshell. 
Reason (R): d-subshell splits into five orbitals.
[1]
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
16. Assertion (A): S.I. unit of atomic mass and molecular mass is kg. 
Reason (R): It is equal to the mass of 6.023  10
23
 atoms.
[1]
× 17. What is meant by conjugate acid base pair? Find the conjugate acid/ base for the following species: 
HNO
2
, CN
-
, HClO
4
, F
-
, OH
-
,  S
2-
[2]
C , O 2 - 3 18. Write the name and atomic number of the following elements.
i. The third alkali metal
ii. The fourth alkaline earth metal
iii. The sixth element of second transition series
iv. The second inner transition element
v. The fifth noble gas.
[2]
19. Calculate the concentration of nitric acid in moles per litre in a sample which has a density 1.41 g mL
-1 
and the
mass per cent of nitric acid in it is being 69%.
[2]
20. How is phenol reduced to benzene? [2]
OR
Convert:
i. Propene to 2, 3-dimethyl butane
ii. Ethane to ethyne
21. Calculate (a) wavenumber and (b) frequency of yellow radiation having wavelength 5800 .
[2]
A o 22. Interpret the non-linear shape of H
2
S molecule and non-planar shape of PCI
3
 using valence shell electron pair
repulsion (VSEPR) theory.
[3]
23. Answer: [3]
Define reaction enthalpy. [1] (i)
Define standard enthalpy. [1] (ii)
Define intensive properties. [1] (iii)
24. How will you calculate work done on an ideal gas in a compression, when the change in pressure is carried out
in infinite steps?
[3]
25. Write correctly the balanced equations for the following redox reactions using half-reactions. [3]
Page 3 of 13
Section D
i. H
2
S + Fe
3+
  Fe
2+
 + S + H
+
ii. I
-
 +  + H
+
  I
2
 + H
2
O
iii. Bi(s) +  + H
+
  NO
2
 + Bi
3+
 + H
2
O 
State what is oxidised to what and what is reduced to what in the reactions expressed by the equations?
? I 0 - 3 ? N O - 3 ? 26. The electronic energy in hydrogen atom is given by E
n
 = (-2.18  10
-18
)/n
2
J.Calculate the energy required to
remove an electron completely from the n = 2 orbit. What is the longest wavelength of light in cm that can be
used to cause this transition?
[3]
× 27. The outer electronic configurations of some elements are:
i. 3s
2 
3p
4
ii. 3d
10
 4s
2
iii. 3s
2
 3p
6
 4s
2
iv. 6s
2
 4f
3
State to which block in the periodic table each of these elements belong.
[3]
28. Two oxides of a metal contain 27.6% and 30.0% of oxygen respectively. If the formula of the first oxide is
M
3
O
4
, find that of the second.
[3]
29. Read the text carefully and answer the questions:
The phenomenon of the existence of two or more compounds possessing the same molecular formula but
different properties is known as isomerism. Such compounds are called isomers. Compounds having the same
molecular formula but different structures (manners in which atoms are linked) are classified as structural
isomers. Structural isomers are classified as chain isomer, position isomer, functional group isomer.
Meristematic arises due to different alkyl chains on either side of the functional group in the molecule and
stereoisomerism and can be classified as geometrical and optical isomerism. Hyperconjugation is a general
stabilising interaction. It involves delocalisation of s electrons of the C-H bond of an alkyl group directly
attached to an atom of an unsaturated system or to an atom with an unshared p orbital. This type of overlap
stabilises the carbocation because electron density from the adjacent s bond helps in dispersing the positive
charge.
[4]
OR
Why Isopentane, pentane and Neopentane are chain isomers? (i)
Why hyperconjugation is a permanent effect?
The molecular formula C
3
H
8
O represents which isomer? (ii)
What type of isomerism is shown by Methoxypropane and ethoxyethane? (iii)
30. Read the text carefully and answer the questions:
In order to explain the characteristic geometrical shapes of polyatomic molecules, Pauling introduced the
concept of hybridisation. The orbitals undergoing hybridisation should have nearly the same energy. There are
various type of hybridisations involving s, p and d-type of orbitals. The type of hybridisation gives the
characteristic shape of the molecule or ion.
[4]
Why all the orbitals in a set of hybridised orbitals have the same shape and energy? (i)
Out of XeF
2
 and SF
2
 which molecule has the same shape as  ion? (ii) N O + 2 Out of XeF
4
 and XeF
2
 which molecule doesn't have the same type of hybridisation as P(Phosphorus) has (iii)
Page 4 of 13
Section E
OR
in PF
5
?
Unsaturated compounds undergo additional reactions. Why?
31. Attempt any five of the following: [5]
Which of the two trans-but-2-ene or trans-pent-2-ene is non-polar? [1] (i)
What is the number of s and p bond in N = C – CH = CH – C = N? [1] (ii)
What are cycloalkanes? [1] (iii)
Write IUPAC name: [1] (iv) C H - C C H 3 ( ) C H 3 2 What do you mean by delocalization? [1] (v)
What is hydrogenation? [1] (vi)
Give the IUPAC name of the lowest molecular weight alkane that contains a quaternary carbon. [1] (vii)
32. Calculate the pH of a 0.10M ammonia solution. Calculate the pH after 50.0 mL of this solution is treated with
25.0 mL of 0.10M HCl. The dissociation constant of ammonia, K
b
 = 1.77  10
–5
[5]
OR
On the basis of Le Chatelier principle explain how temperature and pressure can be adjusted to increase the yield of
ammonia in the following reaction: 
N
2
(g) + 3H
2
(g) 2NH
3
(g) 
 = -92.38 kJmol
-1
What will be the effect of the addition of argon to the above reaction mixture at constant volume?
× ? ? H 33. Answer: [5]
i. Write resonance structures of CH
3
COO
–
 and show the movement of electrons by curved
arrows.
[2.5]
ii. Explain, why an organic liquid vaporizes at a temperature below its boiling point in its steam
distillation?
[2.5]
(i)
OR
i. What are electrophiles and nucleophiles? Explain with examples. [2.5]
ii. Give three points of differences between inductive effect and resonance effect. [2.5]
Page 5 of 13