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Page 1
CBSE XII | CHEMISTRY
Board Paper – 2018
CBSE
Class XII Chemistry
Board Paper – 2018
Time: 3 Hours Total Marks: 70
General Instructions:
? Please check this question paper contains 26 questions.
15 min time has been allotted to read this question paper.
? The question paper has been distributed at 10.15 am.
From 10.15 am to 10.30 am, the students will read the question paper only and
will not write any answer on answer book during this period.
1. Write the coordination number and oxidation state of Platinum in the
complex [Pt (en)2Cl2]. [1]
2. Analysis shows that FeO has a non-stoichiometric composition with formula
Fe0-95O. Give reason. [1]
3. Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed
by aqueous NaOH and why? [1]
4. Write the IUPAC name of the following: [1]
3
33
25
CH
|
CH C CH CH
| |
C H OH
? ? ?
5. CO (g) and H2 (g) react to give different products in the presence of different
catalysts. Which ability of the catalyst is shown by these reactions? [1]
6. Among the hydrides of Group-15 elements, which have the [2]
(a) Lowest boiling point?
(b) Maximum basic character?
(c) Highest bond angle?
(d) Maximum reducing character?
7. Calculate the freezing point of a solution containing 60 g of glucose (Molar
mass = 180g mol
-1
) in 250 g of water. (Kf of water = 1.86 K kg mol
-1
) [2]
Page 2
CBSE XII | CHEMISTRY
Board Paper – 2018
CBSE
Class XII Chemistry
Board Paper – 2018
Time: 3 Hours Total Marks: 70
General Instructions:
? Please check this question paper contains 26 questions.
15 min time has been allotted to read this question paper.
? The question paper has been distributed at 10.15 am.
From 10.15 am to 10.30 am, the students will read the question paper only and
will not write any answer on answer book during this period.
1. Write the coordination number and oxidation state of Platinum in the
complex [Pt (en)2Cl2]. [1]
2. Analysis shows that FeO has a non-stoichiometric composition with formula
Fe0-95O. Give reason. [1]
3. Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed
by aqueous NaOH and why? [1]
4. Write the IUPAC name of the following: [1]
3
33
25
CH
|
CH C CH CH
| |
C H OH
? ? ?
5. CO (g) and H2 (g) react to give different products in the presence of different
catalysts. Which ability of the catalyst is shown by these reactions? [1]
6. Among the hydrides of Group-15 elements, which have the [2]
(a) Lowest boiling point?
(b) Maximum basic character?
(c) Highest bond angle?
(d) Maximum reducing character?
7. Calculate the freezing point of a solution containing 60 g of glucose (Molar
mass = 180g mol
-1
) in 250 g of water. (Kf of water = 1.86 K kg mol
-1
) [2]
CBSE XII | CHEMISTRY
Board Paper – 2018
8. How do you convert the following? [2]
(a) Ethanal to Propanone
(b) Toluene to Benzoic acid
OR
Account for the following:
(a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
(b) pka value of 4-nitrobenzoic acid is lower than that of benzoic acid.
9. Complete and balance the following chemical equations: [2]
(a)
2
4
Fe MnO H
? ? ?
? ? ?
(b)
42
MnO H O I
??
? ? ?
10. For the reaction [2]
2N2O5(g) ? 4NO2(g) + O2 (g)
The rate of formation of NO2(g) is 2.8 x 10
-3
M s
-1
.
Calculate the rate of disappearance of N2O5(g).
11. [3]
(a) Identify the chiral molecule in the following pair:
(b) Write the structure of the product when chlorobenzene is treated with
methyl chloride in the presence of sodium metal and dry ether.
(c) Write the structure of the alkene formed by dehydrohalogenation of 1-
bromo-1-methylcyclohexane with alcoholic KOH.
12. A first order reaction is 50% completed in 40 minutes at 300 K and in 20
minutes at 320 K. Calculate the activation energy of the reaction.
(Given: log 2 = 0.3010, log 4 = 0.6021, R = 8.314 JK
-1
mol
-1
) [3]
13. An element X' (At. mass a 40 g mol
-1
) having f.c.c. structure, has unit cell
edge length of 400 pm. Calculate the density of ‘X’ and the number of unit
cells in 4 g of ‘X’. (NA = 6.022 x 10
23
mol
-1
) [3]
Page 3
CBSE XII | CHEMISTRY
Board Paper – 2018
CBSE
Class XII Chemistry
Board Paper – 2018
Time: 3 Hours Total Marks: 70
General Instructions:
? Please check this question paper contains 26 questions.
15 min time has been allotted to read this question paper.
? The question paper has been distributed at 10.15 am.
From 10.15 am to 10.30 am, the students will read the question paper only and
will not write any answer on answer book during this period.
1. Write the coordination number and oxidation state of Platinum in the
complex [Pt (en)2Cl2]. [1]
2. Analysis shows that FeO has a non-stoichiometric composition with formula
Fe0-95O. Give reason. [1]
3. Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed
by aqueous NaOH and why? [1]
4. Write the IUPAC name of the following: [1]
3
33
25
CH
|
CH C CH CH
| |
C H OH
? ? ?
5. CO (g) and H2 (g) react to give different products in the presence of different
catalysts. Which ability of the catalyst is shown by these reactions? [1]
6. Among the hydrides of Group-15 elements, which have the [2]
(a) Lowest boiling point?
(b) Maximum basic character?
(c) Highest bond angle?
(d) Maximum reducing character?
7. Calculate the freezing point of a solution containing 60 g of glucose (Molar
mass = 180g mol
-1
) in 250 g of water. (Kf of water = 1.86 K kg mol
-1
) [2]
CBSE XII | CHEMISTRY
Board Paper – 2018
8. How do you convert the following? [2]
(a) Ethanal to Propanone
(b) Toluene to Benzoic acid
OR
Account for the following:
(a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
(b) pka value of 4-nitrobenzoic acid is lower than that of benzoic acid.
9. Complete and balance the following chemical equations: [2]
(a)
2
4
Fe MnO H
? ? ?
? ? ?
(b)
42
MnO H O I
??
? ? ?
10. For the reaction [2]
2N2O5(g) ? 4NO2(g) + O2 (g)
The rate of formation of NO2(g) is 2.8 x 10
-3
M s
-1
.
Calculate the rate of disappearance of N2O5(g).
11. [3]
(a) Identify the chiral molecule in the following pair:
(b) Write the structure of the product when chlorobenzene is treated with
methyl chloride in the presence of sodium metal and dry ether.
(c) Write the structure of the alkene formed by dehydrohalogenation of 1-
bromo-1-methylcyclohexane with alcoholic KOH.
12. A first order reaction is 50% completed in 40 minutes at 300 K and in 20
minutes at 320 K. Calculate the activation energy of the reaction.
(Given: log 2 = 0.3010, log 4 = 0.6021, R = 8.314 JK
-1
mol
-1
) [3]
13. An element X' (At. mass a 40 g mol
-1
) having f.c.c. structure, has unit cell
edge length of 400 pm. Calculate the density of ‘X’ and the number of unit
cells in 4 g of ‘X’. (NA = 6.022 x 10
23
mol
-1
) [3]
CBSE XII | CHEMISTRY
Board Paper – 2018
14. Give reasons for the following: [3]
(a) Measurement of osmotic pressure method is preferred for the
determination of molar masses of macromolecules such as proteins and
polymers.
(b) Aquatic animals are more comfortable in cold water than in warm water.
(c) Elevation of boiling point of 1 M KCl solution is nearly double than that
of 1 M sugar solution.
15. What happens when [3]
(a) a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount
of FeCl3 solution?
(b) persistent dialysis of a colloidal solution is carried out?
(c) an emulsion is centrifuged?
16. Write the chemical reactions involved in the process of extraction of Gold.
Explain the role of dilute NaCN and Zn in this process. [3]
17. (A), (B) and (C) are three non-cyclic functional isomers of a carbonyl
compound with molecular formula C4H8O. Isomers (A) and (C) give positive
Tollens' test whereas isomer (B) does not give Tollens test but gives
positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc.
HCl give the same product (D).
(a) Write the structures of (A), (B), (C) and (C).
(b) Out of (A), (B) and (C) isomers, which one is least reactive towards
addition of HCN? [3]
18. [3]
(a) Why is bithional added to soap?
(b) What is tincture of iodine? Write its one use.
(c) Among the following, which one acts as a food preservative? Aspartame,
Aspirin, Sodium Benzoate, Paracetamol
19. [3]
(a) Write the formula of the following coordination compound : iron(III)
hexacyanoferrate(II)
(b) What type of isomerism is exhibited by the complex (Co (NH3)5Cl)SO4?
(c) Write the hybridisation and number of unpaired electrons in the complex
[CoF6]
3-
. (Atomic No. of Co = 27)
20. Define the following with an example of each: [3]
(a) Polysaccharides
(b) Denatured protein
(c) Essential amino acids
OR
Page 4
CBSE XII | CHEMISTRY
Board Paper – 2018
CBSE
Class XII Chemistry
Board Paper – 2018
Time: 3 Hours Total Marks: 70
General Instructions:
? Please check this question paper contains 26 questions.
15 min time has been allotted to read this question paper.
? The question paper has been distributed at 10.15 am.
From 10.15 am to 10.30 am, the students will read the question paper only and
will not write any answer on answer book during this period.
1. Write the coordination number and oxidation state of Platinum in the
complex [Pt (en)2Cl2]. [1]
2. Analysis shows that FeO has a non-stoichiometric composition with formula
Fe0-95O. Give reason. [1]
3. Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed
by aqueous NaOH and why? [1]
4. Write the IUPAC name of the following: [1]
3
33
25
CH
|
CH C CH CH
| |
C H OH
? ? ?
5. CO (g) and H2 (g) react to give different products in the presence of different
catalysts. Which ability of the catalyst is shown by these reactions? [1]
6. Among the hydrides of Group-15 elements, which have the [2]
(a) Lowest boiling point?
(b) Maximum basic character?
(c) Highest bond angle?
(d) Maximum reducing character?
7. Calculate the freezing point of a solution containing 60 g of glucose (Molar
mass = 180g mol
-1
) in 250 g of water. (Kf of water = 1.86 K kg mol
-1
) [2]
CBSE XII | CHEMISTRY
Board Paper – 2018
8. How do you convert the following? [2]
(a) Ethanal to Propanone
(b) Toluene to Benzoic acid
OR
Account for the following:
(a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
(b) pka value of 4-nitrobenzoic acid is lower than that of benzoic acid.
9. Complete and balance the following chemical equations: [2]
(a)
2
4
Fe MnO H
? ? ?
? ? ?
(b)
42
MnO H O I
??
? ? ?
10. For the reaction [2]
2N2O5(g) ? 4NO2(g) + O2 (g)
The rate of formation of NO2(g) is 2.8 x 10
-3
M s
-1
.
Calculate the rate of disappearance of N2O5(g).
11. [3]
(a) Identify the chiral molecule in the following pair:
(b) Write the structure of the product when chlorobenzene is treated with
methyl chloride in the presence of sodium metal and dry ether.
(c) Write the structure of the alkene formed by dehydrohalogenation of 1-
bromo-1-methylcyclohexane with alcoholic KOH.
12. A first order reaction is 50% completed in 40 minutes at 300 K and in 20
minutes at 320 K. Calculate the activation energy of the reaction.
(Given: log 2 = 0.3010, log 4 = 0.6021, R = 8.314 JK
-1
mol
-1
) [3]
13. An element X' (At. mass a 40 g mol
-1
) having f.c.c. structure, has unit cell
edge length of 400 pm. Calculate the density of ‘X’ and the number of unit
cells in 4 g of ‘X’. (NA = 6.022 x 10
23
mol
-1
) [3]
CBSE XII | CHEMISTRY
Board Paper – 2018
14. Give reasons for the following: [3]
(a) Measurement of osmotic pressure method is preferred for the
determination of molar masses of macromolecules such as proteins and
polymers.
(b) Aquatic animals are more comfortable in cold water than in warm water.
(c) Elevation of boiling point of 1 M KCl solution is nearly double than that
of 1 M sugar solution.
15. What happens when [3]
(a) a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount
of FeCl3 solution?
(b) persistent dialysis of a colloidal solution is carried out?
(c) an emulsion is centrifuged?
16. Write the chemical reactions involved in the process of extraction of Gold.
Explain the role of dilute NaCN and Zn in this process. [3]
17. (A), (B) and (C) are three non-cyclic functional isomers of a carbonyl
compound with molecular formula C4H8O. Isomers (A) and (C) give positive
Tollens' test whereas isomer (B) does not give Tollens test but gives
positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc.
HCl give the same product (D).
(a) Write the structures of (A), (B), (C) and (C).
(b) Out of (A), (B) and (C) isomers, which one is least reactive towards
addition of HCN? [3]
18. [3]
(a) Why is bithional added to soap?
(b) What is tincture of iodine? Write its one use.
(c) Among the following, which one acts as a food preservative? Aspartame,
Aspirin, Sodium Benzoate, Paracetamol
19. [3]
(a) Write the formula of the following coordination compound : iron(III)
hexacyanoferrate(II)
(b) What type of isomerism is exhibited by the complex (Co (NH3)5Cl)SO4?
(c) Write the hybridisation and number of unpaired electrons in the complex
[CoF6]
3-
. (Atomic No. of Co = 27)
20. Define the following with an example of each: [3]
(a) Polysaccharides
(b) Denatured protein
(c) Essential amino acids
OR
CBSE XII | CHEMISTRY
Board Paper – 2018
(a) Write the product when 0-glucose reacts with con. HNO3.
(b) Amino acids show amphoteric behaviour. Why?
(c) Write one difference between a-helix and 0-pleated structures of
proteins.
21. Write the structures of the main products in the following reactions: [3]
(i)
(ii)
(iii)
22. Give reasons [3]
(a) E
0
value for Mn
3+
/Mn
2+
couple is much more positive than that for
Fe
3+
/Fe
2+
.
(b) Iron has higher enthalpy of atomization than that of copper.
(c) Sc
3+
is colourless in aqueous solution whereas Ti
3+
is coloured.
23. Shyam went to a grocery shop to purchase some food items. The
shopkeeper packed all the items in polythene bags and gave them to
Shyam. But Shyam refused to accept the polythene bags and asked the
shopkeeper to pack the items in paper bags. He informed the shopkeeper
about the heavy penalty imposed by the government for using polythene
bags. The shopkeeper promised that he would use paper bags in future in
place of polythene bags. [4]
Answer the following:
(a) Write the values (at least two) shown by Shyam.
(b) Write one structural difference between low-density polythene and high-
density polythene.
(c) Why did Shyam refuse to accept the items in polythene bags?
(d) What is a biodegradable polymer? Give an example.
Page 5
CBSE XII | CHEMISTRY
Board Paper – 2018
CBSE
Class XII Chemistry
Board Paper – 2018
Time: 3 Hours Total Marks: 70
General Instructions:
? Please check this question paper contains 26 questions.
15 min time has been allotted to read this question paper.
? The question paper has been distributed at 10.15 am.
From 10.15 am to 10.30 am, the students will read the question paper only and
will not write any answer on answer book during this period.
1. Write the coordination number and oxidation state of Platinum in the
complex [Pt (en)2Cl2]. [1]
2. Analysis shows that FeO has a non-stoichiometric composition with formula
Fe0-95O. Give reason. [1]
3. Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed
by aqueous NaOH and why? [1]
4. Write the IUPAC name of the following: [1]
3
33
25
CH
|
CH C CH CH
| |
C H OH
? ? ?
5. CO (g) and H2 (g) react to give different products in the presence of different
catalysts. Which ability of the catalyst is shown by these reactions? [1]
6. Among the hydrides of Group-15 elements, which have the [2]
(a) Lowest boiling point?
(b) Maximum basic character?
(c) Highest bond angle?
(d) Maximum reducing character?
7. Calculate the freezing point of a solution containing 60 g of glucose (Molar
mass = 180g mol
-1
) in 250 g of water. (Kf of water = 1.86 K kg mol
-1
) [2]
CBSE XII | CHEMISTRY
Board Paper – 2018
8. How do you convert the following? [2]
(a) Ethanal to Propanone
(b) Toluene to Benzoic acid
OR
Account for the following:
(a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
(b) pka value of 4-nitrobenzoic acid is lower than that of benzoic acid.
9. Complete and balance the following chemical equations: [2]
(a)
2
4
Fe MnO H
? ? ?
? ? ?
(b)
42
MnO H O I
??
? ? ?
10. For the reaction [2]
2N2O5(g) ? 4NO2(g) + O2 (g)
The rate of formation of NO2(g) is 2.8 x 10
-3
M s
-1
.
Calculate the rate of disappearance of N2O5(g).
11. [3]
(a) Identify the chiral molecule in the following pair:
(b) Write the structure of the product when chlorobenzene is treated with
methyl chloride in the presence of sodium metal and dry ether.
(c) Write the structure of the alkene formed by dehydrohalogenation of 1-
bromo-1-methylcyclohexane with alcoholic KOH.
12. A first order reaction is 50% completed in 40 minutes at 300 K and in 20
minutes at 320 K. Calculate the activation energy of the reaction.
(Given: log 2 = 0.3010, log 4 = 0.6021, R = 8.314 JK
-1
mol
-1
) [3]
13. An element X' (At. mass a 40 g mol
-1
) having f.c.c. structure, has unit cell
edge length of 400 pm. Calculate the density of ‘X’ and the number of unit
cells in 4 g of ‘X’. (NA = 6.022 x 10
23
mol
-1
) [3]
CBSE XII | CHEMISTRY
Board Paper – 2018
14. Give reasons for the following: [3]
(a) Measurement of osmotic pressure method is preferred for the
determination of molar masses of macromolecules such as proteins and
polymers.
(b) Aquatic animals are more comfortable in cold water than in warm water.
(c) Elevation of boiling point of 1 M KCl solution is nearly double than that
of 1 M sugar solution.
15. What happens when [3]
(a) a freshly prepared precipitate of Fe(OH)3 is shaken with a small amount
of FeCl3 solution?
(b) persistent dialysis of a colloidal solution is carried out?
(c) an emulsion is centrifuged?
16. Write the chemical reactions involved in the process of extraction of Gold.
Explain the role of dilute NaCN and Zn in this process. [3]
17. (A), (B) and (C) are three non-cyclic functional isomers of a carbonyl
compound with molecular formula C4H8O. Isomers (A) and (C) give positive
Tollens' test whereas isomer (B) does not give Tollens test but gives
positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc.
HCl give the same product (D).
(a) Write the structures of (A), (B), (C) and (C).
(b) Out of (A), (B) and (C) isomers, which one is least reactive towards
addition of HCN? [3]
18. [3]
(a) Why is bithional added to soap?
(b) What is tincture of iodine? Write its one use.
(c) Among the following, which one acts as a food preservative? Aspartame,
Aspirin, Sodium Benzoate, Paracetamol
19. [3]
(a) Write the formula of the following coordination compound : iron(III)
hexacyanoferrate(II)
(b) What type of isomerism is exhibited by the complex (Co (NH3)5Cl)SO4?
(c) Write the hybridisation and number of unpaired electrons in the complex
[CoF6]
3-
. (Atomic No. of Co = 27)
20. Define the following with an example of each: [3]
(a) Polysaccharides
(b) Denatured protein
(c) Essential amino acids
OR
CBSE XII | CHEMISTRY
Board Paper – 2018
(a) Write the product when 0-glucose reacts with con. HNO3.
(b) Amino acids show amphoteric behaviour. Why?
(c) Write one difference between a-helix and 0-pleated structures of
proteins.
21. Write the structures of the main products in the following reactions: [3]
(i)
(ii)
(iii)
22. Give reasons [3]
(a) E
0
value for Mn
3+
/Mn
2+
couple is much more positive than that for
Fe
3+
/Fe
2+
.
(b) Iron has higher enthalpy of atomization than that of copper.
(c) Sc
3+
is colourless in aqueous solution whereas Ti
3+
is coloured.
23. Shyam went to a grocery shop to purchase some food items. The
shopkeeper packed all the items in polythene bags and gave them to
Shyam. But Shyam refused to accept the polythene bags and asked the
shopkeeper to pack the items in paper bags. He informed the shopkeeper
about the heavy penalty imposed by the government for using polythene
bags. The shopkeeper promised that he would use paper bags in future in
place of polythene bags. [4]
Answer the following:
(a) Write the values (at least two) shown by Shyam.
(b) Write one structural difference between low-density polythene and high-
density polythene.
(c) Why did Shyam refuse to accept the items in polythene bags?
(d) What is a biodegradable polymer? Give an example.
CBSE XII | CHEMISTRY
Board Paper – 2018
24. [5]
(a) Write the reactions involved in the following:
(i) Hofmann bromamide degradation reaction
(ii) Diazotisation
(iii) Gabriel phthalimide synthesis
(b) Give reasons
(i) (CH3)2NH is more basic than (CH2)3N in an aqueous solution.
(ii) Aromatic diazonium Salts are more stable than aliphatic diazonium
salts.
OR
(a) Write the annums of the main products of the following reactions: [5]
(i)
(ii)
(iii)
(b) Give a simple chemical test to distinguish between Aniline and N,N-
dimethylaniline.
(c) Arrange the following in the increasing order of their pkb values:
C6H5NH2, C2H5NH2, C6H3NHCH3
25. [5]
(a) Give reasons:
(i) H3PO3 undergoes disproportionation reaction but H3PO4 does not.
(ii) When Cl2 reacts with excess of F2, ClF3 is formed and not FCl3.
(iii) Dioxygen is a gas while Sulphur is a solid at room temperature.
(b) Draw the structures of the following:
(i) XeF4
(ii) HClO3
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FAQs on CBSE Chemistry Past year paper - 2018, Class 12 - Chemistry for Grade 12
| 1. What are the main topics covered in the CBSE Chemistry exam for Class 12 in 2018? |  |
Ans. The main topics covered in the CBSE Chemistry exam for Class 12 in 2018 include solid state, solutions, electrochemistry, chemical kinetics, surface chemistry, general principles and processes of isolation of elements, p-block elements, d and f-block elements, coordination compounds, haloalkanes and haloarenes, alcohols, phenols and ethers, aldehydes, ketones and carboxylic acids, organic compounds containing nitrogen, biomolecules, polymers, chemistry in everyday life.
| 2. How many marks is the CBSE Chemistry exam for Class 12 in 2018 worth? | |
Ans. The CBSE Chemistry exam for Class 12 in 2018 is worth 70 marks.
| 3. Can you provide an example of a question from the CBSE Chemistry exam for Class 12 in 2018? | |
Ans. Sure! Here is an example of a question from the CBSE Chemistry exam for Class 12 in 2018:
Question: Define the following terms - (i) Molarity (ii) Molality (iii) Normality.
| 4. What is the time duration for the CBSE Chemistry exam for Class 12 in 2018? | |
Ans. The time duration for the CBSE Chemistry exam for Class 12 in 2018 is 3 hours.
| 5. Are there any practical-based questions in the CBSE Chemistry exam for Class 12 in 2018? | |
Ans. Yes, there are practical-based questions included in the CBSE Chemistry exam for Class 12 in 2018. Students are required to perform experiments and answer related questions based on their observations and analysis.
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Additional Information about CBSE Chemistry Past year paper - 2018, Class 12 for Grade 12 Preparation
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