ICSE Class 10 Chemistry Sample Paper 2025 - 1 | Chemistry Class 10 ICSE PDF Download

 Page 1


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) They are highly chemically reactive b) They are diatomic in their molecular
form
c) They are metallic in nature d) They have seven electrons in their
valence shell
Which of the following properties do not match with elements of the halogen family? [1] (a)
a) Law of triad b) None of these
c) Law of octaves d) Both Law of triad and Law of octaves
Which law is like the seven notes of music; sa, re, ga, ma, pa, ________? [1] (b)
a) It loses electrons and is reduced b) It loses electrons and is oxidised
c) It gains electrons and is oxidised d) It gains electrons and is reduced
When a metal atom becomes an ion: [1] (c)
a) Vinegar b) Antacid
c) Lemon juice d) Common salt
A sample of soil is mixed with water and allowed to settle. The clean supernatant solution turns the
pH paper yellowish-orange. Which of the following would change the colour of this pH paper to
greenish-blue?
[1] (d)
a) remain same b) decrease
c) increase d) Can't say
On diluting solution to pH of 4, its pH will [1] (e)
The salt solution which does not react with ammonium hydroxide is: [1] (f)
Chemistry
Page 2


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) They are highly chemically reactive b) They are diatomic in their molecular
form
c) They are metallic in nature d) They have seven electrons in their
valence shell
Which of the following properties do not match with elements of the halogen family? [1] (a)
a) Law of triad b) None of these
c) Law of octaves d) Both Law of triad and Law of octaves
Which law is like the seven notes of music; sa, re, ga, ma, pa, ________? [1] (b)
a) It loses electrons and is reduced b) It loses electrons and is oxidised
c) It gains electrons and is oxidised d) It gains electrons and is reduced
When a metal atom becomes an ion: [1] (c)
a) Vinegar b) Antacid
c) Lemon juice d) Common salt
A sample of soil is mixed with water and allowed to settle. The clean supernatant solution turns the
pH paper yellowish-orange. Which of the following would change the colour of this pH paper to
greenish-blue?
[1] (d)
a) remain same b) decrease
c) increase d) Can't say
On diluting solution to pH of 4, its pH will [1] (e)
The salt solution which does not react with ammonium hydroxide is: [1] (f)
Chemistry
a) Calcium nitrate b) Copper nitrate
c) Lead nitrate d) Zinc nitrate
a) 53 g b) 106 gs
c) 212 g d) 165 g
A sample of Na
2
CO
3
 contains 6.02  10
23
 Na
+
 ion. The mass of the sample is [Na = 23, C = 12, O =
16]
[1] (g)
× a) 12 moles b) 9 moles
c) 3 moles d) 6 moles
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? 
2KClO
3
  2KCl + 3O
2
  
[1] (h)
? ? a) Option (iii) b) Option (i)
c) Option (ii) d) Option (iv)
Which of the following does not differentiate between electrochemical cell and electrolytic cell?
i. Spontaneous or non-spontaneous nature of chemical process
ii. Chemical reactions occurring at the electrodes
iii. Positive or negative nature of anode
iv. None of these
[1] (i)
a) Copper and tin b) Copper and zinc
c) Copper and lead d) Copper and nickel
The two main metals in bronze are: [1] (j)
a) Typical acid b) Least volatile acid
c) Drying agent d) Dehydrating agent
Dilute sulphuric acid acts as: [1] (k)
a) 1 : 3 b) 1 : 10
c) 10 : 1 d) 3 : 1
The ratio of ammonia and air taken in Ostwald’s process is [1] (l)
a) azeotropic distillation b) vacuum distillation
c) fractional distillation d) steam distillation
Absolute alcohol can be obtained from rectified spirit by [1] (m)
a) Acetic acid b) Sulphuric acid
c) Formic acid d) Nitric acid
Select the acid which contains four hydrogen atoms in it: [1] (n)
a) C
2
H
5
COOC
2
H
5
b) C
2
H
5
COOCH
3
c) CH
3
COOCH
3
d) CH
3
COOC
2
H
5
When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula: [1] (o)
Page 3


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) They are highly chemically reactive b) They are diatomic in their molecular
form
c) They are metallic in nature d) They have seven electrons in their
valence shell
Which of the following properties do not match with elements of the halogen family? [1] (a)
a) Law of triad b) None of these
c) Law of octaves d) Both Law of triad and Law of octaves
Which law is like the seven notes of music; sa, re, ga, ma, pa, ________? [1] (b)
a) It loses electrons and is reduced b) It loses electrons and is oxidised
c) It gains electrons and is oxidised d) It gains electrons and is reduced
When a metal atom becomes an ion: [1] (c)
a) Vinegar b) Antacid
c) Lemon juice d) Common salt
A sample of soil is mixed with water and allowed to settle. The clean supernatant solution turns the
pH paper yellowish-orange. Which of the following would change the colour of this pH paper to
greenish-blue?
[1] (d)
a) remain same b) decrease
c) increase d) Can't say
On diluting solution to pH of 4, its pH will [1] (e)
The salt solution which does not react with ammonium hydroxide is: [1] (f)
Chemistry
a) Calcium nitrate b) Copper nitrate
c) Lead nitrate d) Zinc nitrate
a) 53 g b) 106 gs
c) 212 g d) 165 g
A sample of Na
2
CO
3
 contains 6.02  10
23
 Na
+
 ion. The mass of the sample is [Na = 23, C = 12, O =
16]
[1] (g)
× a) 12 moles b) 9 moles
c) 3 moles d) 6 moles
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? 
2KClO
3
  2KCl + 3O
2
  
[1] (h)
? ? a) Option (iii) b) Option (i)
c) Option (ii) d) Option (iv)
Which of the following does not differentiate between electrochemical cell and electrolytic cell?
i. Spontaneous or non-spontaneous nature of chemical process
ii. Chemical reactions occurring at the electrodes
iii. Positive or negative nature of anode
iv. None of these
[1] (i)
a) Copper and tin b) Copper and zinc
c) Copper and lead d) Copper and nickel
The two main metals in bronze are: [1] (j)
a) Typical acid b) Least volatile acid
c) Drying agent d) Dehydrating agent
Dilute sulphuric acid acts as: [1] (k)
a) 1 : 3 b) 1 : 10
c) 10 : 1 d) 3 : 1
The ratio of ammonia and air taken in Ostwald’s process is [1] (l)
a) azeotropic distillation b) vacuum distillation
c) fractional distillation d) steam distillation
Absolute alcohol can be obtained from rectified spirit by [1] (m)
a) Acetic acid b) Sulphuric acid
c) Formic acid d) Nitric acid
Select the acid which contains four hydrogen atoms in it: [1] (n)
a) C
2
H
5
COOC
2
H
5
b) C
2
H
5
COOCH
3
c) CH
3
COOCH
3
d) CH
3
COOC
2
H
5
When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula: [1] (o)
2. Question 2 [25]
i. Nitrogen can be obtained in pure state by heating a mixture of ammonium chloride and a
substance A. Name the substance A.
ii. A gas X reacts with another gas Y in the presence of catalyst Z to give a colourless gas C. The gas
C on reacting with air produces a brown gas A. The solution of X in water turns red litmus to blue.
Explain the observation.
iii. Why nitrogen dioxide is called mixed anhydride?
[5] (a)
Name the method used for preparation of the following salts from the list given below -
Column I Column II
(a) Sodium nitrate (i) Simple displacement
(b) Iron (III) chloride (ii) Neutralisation
(c) Lead chloride (iii) Double decomposition
(d) Zinc sulphate (iv) Direct synthesis
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. ________ are the longest periods, containing 32 elements each. [1]
ii. Soluble salts are prepared by ________ whereas insoluble salts are generally prepared by
________.
[1]
iii. ________ is defined as the amount of substance which contains same number of units as the
number of atoms in 12 g of carbon-12.
[1]
iv. Pure water consists almost entirely of ________ (ions/molecules). [1]
v. Hydrogen chloride and water are examples of ________ (polar covalent compounds/non-polar
covalent compounds) and a solution of hydrogen chloride in water ________ (contains/does
not contain) free ions.
[1]
(c)
Identify the following:
i. The covalent compounds of carbon and hydrogen. [1]
ii. A yellow non-metal formed when hydrogen sulphide gas is passed through concentrated nitric
acid.
[1]
iii. The process of coating of iron with zinc. [1]
iv. Ice like crystals formed on cooling an organic acid sufficiently. [1]
v. Group 2 elements are called ________ metals. (alkali/alkaline) [1]
(d)
i. The volumes of gases A, B, C and D are in the ratio, 1 : 2 : 2 : 4 under the same conditions of
temperature and pressure.
i. Which sample of gas contains the maximum number of molecules?
ii. If the temperature and the pressure of gas A are kept constant, then what will happen to the
volume of A when the number of molecules is doubled?
iii. If this ratio of gas volumes refers to the reactants and products of a reaction, which gas law
is being observed?
[2]
ii. An element A is placed on the left side of the periodic table with valency 2 and element B is
placed on the right side of the periodic table with valency 3.
i. Write the equation to show how A and B form ions.
[3]
(e)
Page 4


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) They are highly chemically reactive b) They are diatomic in their molecular
form
c) They are metallic in nature d) They have seven electrons in their
valence shell
Which of the following properties do not match with elements of the halogen family? [1] (a)
a) Law of triad b) None of these
c) Law of octaves d) Both Law of triad and Law of octaves
Which law is like the seven notes of music; sa, re, ga, ma, pa, ________? [1] (b)
a) It loses electrons and is reduced b) It loses electrons and is oxidised
c) It gains electrons and is oxidised d) It gains electrons and is reduced
When a metal atom becomes an ion: [1] (c)
a) Vinegar b) Antacid
c) Lemon juice d) Common salt
A sample of soil is mixed with water and allowed to settle. The clean supernatant solution turns the
pH paper yellowish-orange. Which of the following would change the colour of this pH paper to
greenish-blue?
[1] (d)
a) remain same b) decrease
c) increase d) Can't say
On diluting solution to pH of 4, its pH will [1] (e)
The salt solution which does not react with ammonium hydroxide is: [1] (f)
Chemistry
a) Calcium nitrate b) Copper nitrate
c) Lead nitrate d) Zinc nitrate
a) 53 g b) 106 gs
c) 212 g d) 165 g
A sample of Na
2
CO
3
 contains 6.02  10
23
 Na
+
 ion. The mass of the sample is [Na = 23, C = 12, O =
16]
[1] (g)
× a) 12 moles b) 9 moles
c) 3 moles d) 6 moles
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? 
2KClO
3
  2KCl + 3O
2
  
[1] (h)
? ? a) Option (iii) b) Option (i)
c) Option (ii) d) Option (iv)
Which of the following does not differentiate between electrochemical cell and electrolytic cell?
i. Spontaneous or non-spontaneous nature of chemical process
ii. Chemical reactions occurring at the electrodes
iii. Positive or negative nature of anode
iv. None of these
[1] (i)
a) Copper and tin b) Copper and zinc
c) Copper and lead d) Copper and nickel
The two main metals in bronze are: [1] (j)
a) Typical acid b) Least volatile acid
c) Drying agent d) Dehydrating agent
Dilute sulphuric acid acts as: [1] (k)
a) 1 : 3 b) 1 : 10
c) 10 : 1 d) 3 : 1
The ratio of ammonia and air taken in Ostwald’s process is [1] (l)
a) azeotropic distillation b) vacuum distillation
c) fractional distillation d) steam distillation
Absolute alcohol can be obtained from rectified spirit by [1] (m)
a) Acetic acid b) Sulphuric acid
c) Formic acid d) Nitric acid
Select the acid which contains four hydrogen atoms in it: [1] (n)
a) C
2
H
5
COOC
2
H
5
b) C
2
H
5
COOCH
3
c) CH
3
COOCH
3
d) CH
3
COOC
2
H
5
When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula: [1] (o)
2. Question 2 [25]
i. Nitrogen can be obtained in pure state by heating a mixture of ammonium chloride and a
substance A. Name the substance A.
ii. A gas X reacts with another gas Y in the presence of catalyst Z to give a colourless gas C. The gas
C on reacting with air produces a brown gas A. The solution of X in water turns red litmus to blue.
Explain the observation.
iii. Why nitrogen dioxide is called mixed anhydride?
[5] (a)
Name the method used for preparation of the following salts from the list given below -
Column I Column II
(a) Sodium nitrate (i) Simple displacement
(b) Iron (III) chloride (ii) Neutralisation
(c) Lead chloride (iii) Double decomposition
(d) Zinc sulphate (iv) Direct synthesis
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. ________ are the longest periods, containing 32 elements each. [1]
ii. Soluble salts are prepared by ________ whereas insoluble salts are generally prepared by
________.
[1]
iii. ________ is defined as the amount of substance which contains same number of units as the
number of atoms in 12 g of carbon-12.
[1]
iv. Pure water consists almost entirely of ________ (ions/molecules). [1]
v. Hydrogen chloride and water are examples of ________ (polar covalent compounds/non-polar
covalent compounds) and a solution of hydrogen chloride in water ________ (contains/does
not contain) free ions.
[1]
(c)
Identify the following:
i. The covalent compounds of carbon and hydrogen. [1]
ii. A yellow non-metal formed when hydrogen sulphide gas is passed through concentrated nitric
acid.
[1]
iii. The process of coating of iron with zinc. [1]
iv. Ice like crystals formed on cooling an organic acid sufficiently. [1]
v. Group 2 elements are called ________ metals. (alkali/alkaline) [1]
(d)
i. The volumes of gases A, B, C and D are in the ratio, 1 : 2 : 2 : 4 under the same conditions of
temperature and pressure.
i. Which sample of gas contains the maximum number of molecules?
ii. If the temperature and the pressure of gas A are kept constant, then what will happen to the
volume of A when the number of molecules is doubled?
iii. If this ratio of gas volumes refers to the reactants and products of a reaction, which gas law
is being observed?
[2]
ii. An element A is placed on the left side of the periodic table with valency 2 and element B is
placed on the right side of the periodic table with valency 3.
i. Write the equation to show how A and B form ions.
[3]
(e)
Section B
Attempt any 4 questions
ii. Which of the two elements will show reduction?
iii. If B is a diatomic gas, write the equation for the direct combination of A and B to form a
compound.
3. Question 3 [10]
Give the equations involved in brown ring test. [2] (a)
Write the products and balance the equation.
i. Zinc carbonate from Zinc sulphate. [1]
ii. Sodium sulphate using dilute sulphuric acid. [1]
(b)
Arrange the following as per the instruction given in the brackets:
i. Na, K, Li (increasing chemical reactivity) [1]
ii. He, Ar, Ne (Increasing order of the number of shells) [1]
iii. Br, F, Cl [decreasing order of atomic radius] [1]
(c)
Fill in the blanks by selecting the appropriate word from the given choice:
i. The carbon compounds containing ________ group are known as carbonylic acids. [1]
ii. A carbon atom linked with two carbon atoms is known as ________ carbon. [1]
iii. Complete the following, n = [1]
(d)
M o l e c u l a r m a s s _ _ _ _ _ _ _ _ 4. Question 4 [10]
The non-polar and polar covalent compounds are generally formed between what kind of atoms? [2] (a)
Calculate the mass of calcium that will contain the same number of atoms as are present in 3.2 gm of
sulphur. 
[Atomic masses: S = 32, Ca = 40]
[2] (b)
Answer the following questions with respect to the electrolytic process in the extraction of
aluminium:
i. Identify the components of the electrolyte other than pure alumina and the role played by each.
ii. Explain why powdered coke is sprinkled over the electrolytic mixture.
[3] (c)
Explain the following:
i. Zinc oxide can be reduced to zinc by using carbon monoxide, but aluminium oxide cannot be
reduced by a reducing agent.
[1]
ii. Anhydrous hydrogen chloride gas and anhydrous liquified hydrogen chloride are not acids. [1]
iii. Sodium chloride will conduct electricity only in fused or aqueous solution state. [1]
(d)
5. Question 5 [10]
i. Write the IUPAC name of the given compounds: [1]
ii. Draw the relevant structural formula for vinegar. [1]
(a)
H - - C = C - H C | H | H Draw the appropriate structural formula of carbon tetrachloride and state the type of bond present in
it.
[2] (b)
Give balanced chemical equation for the following: (c)
Page 5


Time Allowed: 2 hours Maximum Marks: 80 
General Instructions:
Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].
Section A
1. Question 1 Choose one correct answer to the questions from the given options: [15]
a) They are highly chemically reactive b) They are diatomic in their molecular
form
c) They are metallic in nature d) They have seven electrons in their
valence shell
Which of the following properties do not match with elements of the halogen family? [1] (a)
a) Law of triad b) None of these
c) Law of octaves d) Both Law of triad and Law of octaves
Which law is like the seven notes of music; sa, re, ga, ma, pa, ________? [1] (b)
a) It loses electrons and is reduced b) It loses electrons and is oxidised
c) It gains electrons and is oxidised d) It gains electrons and is reduced
When a metal atom becomes an ion: [1] (c)
a) Vinegar b) Antacid
c) Lemon juice d) Common salt
A sample of soil is mixed with water and allowed to settle. The clean supernatant solution turns the
pH paper yellowish-orange. Which of the following would change the colour of this pH paper to
greenish-blue?
[1] (d)
a) remain same b) decrease
c) increase d) Can't say
On diluting solution to pH of 4, its pH will [1] (e)
The salt solution which does not react with ammonium hydroxide is: [1] (f)
Chemistry
a) Calcium nitrate b) Copper nitrate
c) Lead nitrate d) Zinc nitrate
a) 53 g b) 106 gs
c) 212 g d) 165 g
A sample of Na
2
CO
3
 contains 6.02  10
23
 Na
+
 ion. The mass of the sample is [Na = 23, C = 12, O =
16]
[1] (g)
× a) 12 moles b) 9 moles
c) 3 moles d) 6 moles
How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? 
2KClO
3
  2KCl + 3O
2
  
[1] (h)
? ? a) Option (iii) b) Option (i)
c) Option (ii) d) Option (iv)
Which of the following does not differentiate between electrochemical cell and electrolytic cell?
i. Spontaneous or non-spontaneous nature of chemical process
ii. Chemical reactions occurring at the electrodes
iii. Positive or negative nature of anode
iv. None of these
[1] (i)
a) Copper and tin b) Copper and zinc
c) Copper and lead d) Copper and nickel
The two main metals in bronze are: [1] (j)
a) Typical acid b) Least volatile acid
c) Drying agent d) Dehydrating agent
Dilute sulphuric acid acts as: [1] (k)
a) 1 : 3 b) 1 : 10
c) 10 : 1 d) 3 : 1
The ratio of ammonia and air taken in Ostwald’s process is [1] (l)
a) azeotropic distillation b) vacuum distillation
c) fractional distillation d) steam distillation
Absolute alcohol can be obtained from rectified spirit by [1] (m)
a) Acetic acid b) Sulphuric acid
c) Formic acid d) Nitric acid
Select the acid which contains four hydrogen atoms in it: [1] (n)
a) C
2
H
5
COOC
2
H
5
b) C
2
H
5
COOCH
3
c) CH
3
COOCH
3
d) CH
3
COOC
2
H
5
When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula: [1] (o)
2. Question 2 [25]
i. Nitrogen can be obtained in pure state by heating a mixture of ammonium chloride and a
substance A. Name the substance A.
ii. A gas X reacts with another gas Y in the presence of catalyst Z to give a colourless gas C. The gas
C on reacting with air produces a brown gas A. The solution of X in water turns red litmus to blue.
Explain the observation.
iii. Why nitrogen dioxide is called mixed anhydride?
[5] (a)
Name the method used for preparation of the following salts from the list given below -
Column I Column II
(a) Sodium nitrate (i) Simple displacement
(b) Iron (III) chloride (ii) Neutralisation
(c) Lead chloride (iii) Double decomposition
(d) Zinc sulphate (iv) Direct synthesis
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. ________ are the longest periods, containing 32 elements each. [1]
ii. Soluble salts are prepared by ________ whereas insoluble salts are generally prepared by
________.
[1]
iii. ________ is defined as the amount of substance which contains same number of units as the
number of atoms in 12 g of carbon-12.
[1]
iv. Pure water consists almost entirely of ________ (ions/molecules). [1]
v. Hydrogen chloride and water are examples of ________ (polar covalent compounds/non-polar
covalent compounds) and a solution of hydrogen chloride in water ________ (contains/does
not contain) free ions.
[1]
(c)
Identify the following:
i. The covalent compounds of carbon and hydrogen. [1]
ii. A yellow non-metal formed when hydrogen sulphide gas is passed through concentrated nitric
acid.
[1]
iii. The process of coating of iron with zinc. [1]
iv. Ice like crystals formed on cooling an organic acid sufficiently. [1]
v. Group 2 elements are called ________ metals. (alkali/alkaline) [1]
(d)
i. The volumes of gases A, B, C and D are in the ratio, 1 : 2 : 2 : 4 under the same conditions of
temperature and pressure.
i. Which sample of gas contains the maximum number of molecules?
ii. If the temperature and the pressure of gas A are kept constant, then what will happen to the
volume of A when the number of molecules is doubled?
iii. If this ratio of gas volumes refers to the reactants and products of a reaction, which gas law
is being observed?
[2]
ii. An element A is placed on the left side of the periodic table with valency 2 and element B is
placed on the right side of the periodic table with valency 3.
i. Write the equation to show how A and B form ions.
[3]
(e)
Section B
Attempt any 4 questions
ii. Which of the two elements will show reduction?
iii. If B is a diatomic gas, write the equation for the direct combination of A and B to form a
compound.
3. Question 3 [10]
Give the equations involved in brown ring test. [2] (a)
Write the products and balance the equation.
i. Zinc carbonate from Zinc sulphate. [1]
ii. Sodium sulphate using dilute sulphuric acid. [1]
(b)
Arrange the following as per the instruction given in the brackets:
i. Na, K, Li (increasing chemical reactivity) [1]
ii. He, Ar, Ne (Increasing order of the number of shells) [1]
iii. Br, F, Cl [decreasing order of atomic radius] [1]
(c)
Fill in the blanks by selecting the appropriate word from the given choice:
i. The carbon compounds containing ________ group are known as carbonylic acids. [1]
ii. A carbon atom linked with two carbon atoms is known as ________ carbon. [1]
iii. Complete the following, n = [1]
(d)
M o l e c u l a r m a s s _ _ _ _ _ _ _ _ 4. Question 4 [10]
The non-polar and polar covalent compounds are generally formed between what kind of atoms? [2] (a)
Calculate the mass of calcium that will contain the same number of atoms as are present in 3.2 gm of
sulphur. 
[Atomic masses: S = 32, Ca = 40]
[2] (b)
Answer the following questions with respect to the electrolytic process in the extraction of
aluminium:
i. Identify the components of the electrolyte other than pure alumina and the role played by each.
ii. Explain why powdered coke is sprinkled over the electrolytic mixture.
[3] (c)
Explain the following:
i. Zinc oxide can be reduced to zinc by using carbon monoxide, but aluminium oxide cannot be
reduced by a reducing agent.
[1]
ii. Anhydrous hydrogen chloride gas and anhydrous liquified hydrogen chloride are not acids. [1]
iii. Sodium chloride will conduct electricity only in fused or aqueous solution state. [1]
(d)
5. Question 5 [10]
i. Write the IUPAC name of the given compounds: [1]
ii. Draw the relevant structural formula for vinegar. [1]
(a)
H - - C = C - H C | H | H Draw the appropriate structural formula of carbon tetrachloride and state the type of bond present in
it.
[2] (b)
Give balanced chemical equation for the following: (c)
i. The oxidising action of conc. sulphuric acid on carbon [1]
ii. Action of concentrated sulphuric acid on carbon [1]
iii. Dilute hydrochloric acid on sodium sulphite [1]
State one relevant observation for each of the following reactions:
i. Dilute hydrochloric acid is added to sodium carbonate crystals. [1]
ii. A mixture of ammonium chloride and sodium hydroxide is heated. [1]
iii. In the electrolyte during the electrolysis of copper sulphate solutions with inert electrodes. [1]
(d)
6. Question 6 [10]
i. Why do group 1 elements form unipositive ions?
ii. Why do all elements in a group have similar properties?
[2] (a)
Find the empirical formulae of the compounds with the following percentage compositions,
i. Zn = 47.8
ii. Cl = 52.2
[2] (b)
Write the name and structure of at least one isomer in each of the following.
i. H
3
COCH
3
ii. H
3
C-CO-CH
3
iii. 
[3] (c)
Write the product of the following reactions.
i. Ca(NO
3
)
2
 + 2NaOH 
ii. FeSO
4
 + NaOH 
iii. FeCl
3
 + 3NaOH 
iv. CuSO
4
 + NaOH 
v. ZnSO
4
 + NaOH 
vi. Pb(NO
3
) + 2NaOH 
[3] (d)
? ? ? ? ? ? 7. Question 7 [10]
i. What do you understand by a lone pair of electrons?
ii. Draw the electron dot diagram of Hydronium ion. (H = 1, O = 8)
[2] (a)
A gas cylinder contains 24  10
24
 molecules of nitrogen gas. If Avogadro's number is 6  10
23
 and
the relative mass of nitrogen is 14, calculate:
i. mass of nitrogen as in the cylinder
ii. volume of nitrogen at STP in dm
3
[2] (b)
× × Name the kind of particle present in
i. sodium hydroxide solution
ii. carbonic acid
iii. sugar solution
[3] (c)
Give a laboratory preparation of
i. ethyl alcohol
ii. methyl alcohol
[3] (d)