ICSE Class 10 Chemistry Sample Paper 2025 - 5 | 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) Atomic radius increases and nuclear
charge increases
b) Atomic radius decreases and nuclear
charge decreases
c) Atomic radius increases and nuclear
charge decreases
d) Atomic radius decreases and nuclear
charge increases
Ionisation potential increases over a period from left to right because the ________. [1] (a)
a) 17 b) 11
c) 18 d) 20
An element with the atomic number 19 will most likely combine chemically with the element whose
atomic number is
[1] (b)
a) it has a high melting point b) it is easily vaporised
c) it often exists as a liquid d) it is a weak electrolyte
The property which is characteristic of an electrovalent compound is that [1] (c)
a) Sodium nitrate b) Copper nitrate
c) Zinc nitrate d) Lead nitrate
Dilute sulphuric acid will produce a white precipitate when added to a solution of ________. [1] (d)
a) neutralisation reaction b) decomposition reaction
c) combination reaction d) redox reaction
The reaction, which involves the formation of salts is [1] (e)
A metal hydroxide which is unsoluble in caustic but soluble in excess of NH
4
OH 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) Atomic radius increases and nuclear
charge increases
b) Atomic radius decreases and nuclear
charge decreases
c) Atomic radius increases and nuclear
charge decreases
d) Atomic radius decreases and nuclear
charge increases
Ionisation potential increases over a period from left to right because the ________. [1] (a)
a) 17 b) 11
c) 18 d) 20
An element with the atomic number 19 will most likely combine chemically with the element whose
atomic number is
[1] (b)
a) it has a high melting point b) it is easily vaporised
c) it often exists as a liquid d) it is a weak electrolyte
The property which is characteristic of an electrovalent compound is that [1] (c)
a) Sodium nitrate b) Copper nitrate
c) Zinc nitrate d) Lead nitrate
Dilute sulphuric acid will produce a white precipitate when added to a solution of ________. [1] (d)
a) neutralisation reaction b) decomposition reaction
c) combination reaction d) redox reaction
The reaction, which involves the formation of salts is [1] (e)
A metal hydroxide which is unsoluble in caustic but soluble in excess of NH
4
OH is [1] (f)
 Chemistry
a) Zn(OH)
2
b) O(OH)
2
c) CO(OH)
2
d) Cu(OH)
2
a) C
2
H
15
b) C
4
H
12
c) C
2
H
5
d) C
3
H
8
The empirical formula of butane is [1] (g)
a) 4M b) 2M
c) M d)
The vapour density of a gas A is four times that of B. If molecular mass of B is M, then molecular
mass of A is
[1] (h)
M 4 a) The electrons will flow from the
magnesium electrode to the copper
electrode
b) A gas will be given off at the
magnesium electrode
c) The bulb will light up d) A gas will be given off at the copper
electrode
A simple cell is set up with magnesium and copper as the electrodes and dilute sulphuric acid as the
electrolyte. Which of the following will not occur?
[1] (i)
a) H
2
SO
4
b) CaCO
3
c) SiO
2
d) Both CaO and SiO
2
An ore after levigation is found to have basic impurities. Which of the following can be used as flux
during smelting?
[1] (j)
a) Hydrogen sulphide b) Sulphur dioxide
c) Vapour of sulphuric acid d) Sulphur trioxide
When dilute sulphuric acid reacts with iron, sulphide, the gas evolved is: [1] (k)
a) AgNO
3
b) NH
3
c) H
2
SO
4
d) MnO
2
Which of the following is not used to detect hydrochloric acid? [1] (l)
a) Butane, 2-methylbutane, 2, 3-
dimethylbutane
b) Ethane, ethylene, acetylene
c) Methanol, ethanol, propanoic acid d) Ethane, propane, butanone
Which of the following forms a homologous series? [1] (m)
a) Wohler b) Haber
c) Berzelius d) Lavoisier
Urea was first obtained by heating ammonium cyanate by: [1] (n)
a) Cracking b) Catenation
The property of carbon to form chains and rings is called: [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) Atomic radius increases and nuclear
charge increases
b) Atomic radius decreases and nuclear
charge decreases
c) Atomic radius increases and nuclear
charge decreases
d) Atomic radius decreases and nuclear
charge increases
Ionisation potential increases over a period from left to right because the ________. [1] (a)
a) 17 b) 11
c) 18 d) 20
An element with the atomic number 19 will most likely combine chemically with the element whose
atomic number is
[1] (b)
a) it has a high melting point b) it is easily vaporised
c) it often exists as a liquid d) it is a weak electrolyte
The property which is characteristic of an electrovalent compound is that [1] (c)
a) Sodium nitrate b) Copper nitrate
c) Zinc nitrate d) Lead nitrate
Dilute sulphuric acid will produce a white precipitate when added to a solution of ________. [1] (d)
a) neutralisation reaction b) decomposition reaction
c) combination reaction d) redox reaction
The reaction, which involves the formation of salts is [1] (e)
A metal hydroxide which is unsoluble in caustic but soluble in excess of NH
4
OH is [1] (f)
 Chemistry
a) Zn(OH)
2
b) O(OH)
2
c) CO(OH)
2
d) Cu(OH)
2
a) C
2
H
15
b) C
4
H
12
c) C
2
H
5
d) C
3
H
8
The empirical formula of butane is [1] (g)
a) 4M b) 2M
c) M d)
The vapour density of a gas A is four times that of B. If molecular mass of B is M, then molecular
mass of A is
[1] (h)
M 4 a) The electrons will flow from the
magnesium electrode to the copper
electrode
b) A gas will be given off at the
magnesium electrode
c) The bulb will light up d) A gas will be given off at the copper
electrode
A simple cell is set up with magnesium and copper as the electrodes and dilute sulphuric acid as the
electrolyte. Which of the following will not occur?
[1] (i)
a) H
2
SO
4
b) CaCO
3
c) SiO
2
d) Both CaO and SiO
2
An ore after levigation is found to have basic impurities. Which of the following can be used as flux
during smelting?
[1] (j)
a) Hydrogen sulphide b) Sulphur dioxide
c) Vapour of sulphuric acid d) Sulphur trioxide
When dilute sulphuric acid reacts with iron, sulphide, the gas evolved is: [1] (k)
a) AgNO
3
b) NH
3
c) H
2
SO
4
d) MnO
2
Which of the following is not used to detect hydrochloric acid? [1] (l)
a) Butane, 2-methylbutane, 2, 3-
dimethylbutane
b) Ethane, ethylene, acetylene
c) Methanol, ethanol, propanoic acid d) Ethane, propane, butanone
Which of the following forms a homologous series? [1] (m)
a) Wohler b) Haber
c) Berzelius d) Lavoisier
Urea was first obtained by heating ammonium cyanate by: [1] (n)
a) Cracking b) Catenation
The property of carbon to form chains and rings is called: [1] (o)
c) Hydrogenation d) Polymerization
2. Question 2 [25]
Reaction: 
a. Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
b. In the contact process for manufacture of the sulphuric acid, sulphur trioxide is not converted to
sulphuric by reacting it with water, instead two steps procedure is used. Write equation for the two
steps involved.
c. What type of substance will liberate dioxide from sodium sulphite?
d. Write the equation for the reaction, where sulphur dioxide is converted sodium sulphite in step F.
e. Name the process used in A.
f. What is the reaction involved in B?
[5] (a)
Match the salts given in Column I with their method of preparation given in Column II:
Column I Column II
(a) Pb(NO
3
)
2 
from PbO
(i) Simple displacement
(b) MgCl
2
 from Mg
(ii) Titration
(c) FeCl
3
 from Fe
(iii) Neutralisation
(d) NaNO
3
 from NaOH
(iv) Combination
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. Metals are good ________ (oxidizing agents/reducing agents) because they are electron
________ (acceptors/donors).
[1]
ii. The basicity of acetic acid is ________. (3, 1, 4) [1]
iii. A formula which shows the simplest whole number ratio is ________. [1]
iv. ________ the concentration of an ion in a solution, the greater is the probability of its being
discharged at its appropriate electrode.
[1]
v. Nitric acid is a strong ________ agent therefore it does not liberate hydrogen on reaction with
metals.
[1]
(c)
Identify the following:
i. Compound containing  functional group.
[1]
ii. A colourless gas that becomes reddish brown when it comes in contact with atmosphere. [1]
iii. The process of extraction of metals from its ores by electrolysis. [1]
iv. A compound which is soluble in water and the only negative ions in the solution are hydroxide
ions.
[1]
v. Metals form ________ chlorides. (Covalent/ionic) [1]
(d)
- - H C
| | O
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) Atomic radius increases and nuclear
charge increases
b) Atomic radius decreases and nuclear
charge decreases
c) Atomic radius increases and nuclear
charge decreases
d) Atomic radius decreases and nuclear
charge increases
Ionisation potential increases over a period from left to right because the ________. [1] (a)
a) 17 b) 11
c) 18 d) 20
An element with the atomic number 19 will most likely combine chemically with the element whose
atomic number is
[1] (b)
a) it has a high melting point b) it is easily vaporised
c) it often exists as a liquid d) it is a weak electrolyte
The property which is characteristic of an electrovalent compound is that [1] (c)
a) Sodium nitrate b) Copper nitrate
c) Zinc nitrate d) Lead nitrate
Dilute sulphuric acid will produce a white precipitate when added to a solution of ________. [1] (d)
a) neutralisation reaction b) decomposition reaction
c) combination reaction d) redox reaction
The reaction, which involves the formation of salts is [1] (e)
A metal hydroxide which is unsoluble in caustic but soluble in excess of NH
4
OH is [1] (f)
 Chemistry
a) Zn(OH)
2
b) O(OH)
2
c) CO(OH)
2
d) Cu(OH)
2
a) C
2
H
15
b) C
4
H
12
c) C
2
H
5
d) C
3
H
8
The empirical formula of butane is [1] (g)
a) 4M b) 2M
c) M d)
The vapour density of a gas A is four times that of B. If molecular mass of B is M, then molecular
mass of A is
[1] (h)
M 4 a) The electrons will flow from the
magnesium electrode to the copper
electrode
b) A gas will be given off at the
magnesium electrode
c) The bulb will light up d) A gas will be given off at the copper
electrode
A simple cell is set up with magnesium and copper as the electrodes and dilute sulphuric acid as the
electrolyte. Which of the following will not occur?
[1] (i)
a) H
2
SO
4
b) CaCO
3
c) SiO
2
d) Both CaO and SiO
2
An ore after levigation is found to have basic impurities. Which of the following can be used as flux
during smelting?
[1] (j)
a) Hydrogen sulphide b) Sulphur dioxide
c) Vapour of sulphuric acid d) Sulphur trioxide
When dilute sulphuric acid reacts with iron, sulphide, the gas evolved is: [1] (k)
a) AgNO
3
b) NH
3
c) H
2
SO
4
d) MnO
2
Which of the following is not used to detect hydrochloric acid? [1] (l)
a) Butane, 2-methylbutane, 2, 3-
dimethylbutane
b) Ethane, ethylene, acetylene
c) Methanol, ethanol, propanoic acid d) Ethane, propane, butanone
Which of the following forms a homologous series? [1] (m)
a) Wohler b) Haber
c) Berzelius d) Lavoisier
Urea was first obtained by heating ammonium cyanate by: [1] (n)
a) Cracking b) Catenation
The property of carbon to form chains and rings is called: [1] (o)
c) Hydrogenation d) Polymerization
2. Question 2 [25]
Reaction: 
a. Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
b. In the contact process for manufacture of the sulphuric acid, sulphur trioxide is not converted to
sulphuric by reacting it with water, instead two steps procedure is used. Write equation for the two
steps involved.
c. What type of substance will liberate dioxide from sodium sulphite?
d. Write the equation for the reaction, where sulphur dioxide is converted sodium sulphite in step F.
e. Name the process used in A.
f. What is the reaction involved in B?
[5] (a)
Match the salts given in Column I with their method of preparation given in Column II:
Column I Column II
(a) Pb(NO
3
)
2 
from PbO
(i) Simple displacement
(b) MgCl
2
 from Mg
(ii) Titration
(c) FeCl
3
 from Fe
(iii) Neutralisation
(d) NaNO
3
 from NaOH
(iv) Combination
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. Metals are good ________ (oxidizing agents/reducing agents) because they are electron
________ (acceptors/donors).
[1]
ii. The basicity of acetic acid is ________. (3, 1, 4) [1]
iii. A formula which shows the simplest whole number ratio is ________. [1]
iv. ________ the concentration of an ion in a solution, the greater is the probability of its being
discharged at its appropriate electrode.
[1]
v. Nitric acid is a strong ________ agent therefore it does not liberate hydrogen on reaction with
metals.
[1]
(c)
Identify the following:
i. Compound containing  functional group.
[1]
ii. A colourless gas that becomes reddish brown when it comes in contact with atmosphere. [1]
iii. The process of extraction of metals from its ores by electrolysis. [1]
iv. A compound which is soluble in water and the only negative ions in the solution are hydroxide
ions.
[1]
v. Metals form ________ chlorides. (Covalent/ionic) [1]
(d)
- - H C
| | O
Section B
Attempt any 4 questions
i. A compound made up of two elements X and Y has an empirical formula X
2
Y . If the atomic
weight of X is 10 and that of Y is 5 and the compound has a vapour density 25, find the
molecular formula.
[2]
ii. Draw the electron dot diagram for the compounds given below. Represent the electron by ( )
and ( ) in the diagram. [Atomic No.: Ca = 20, O = 8, Cl = 17, H = 1]
i. Calcium oxide
ii. Chlorine molecule
iii. Water molecule
[3]
(e)
· × 3. Question 3 [10]
Why phosphorous pentaoxide and quick lime cannot be used for drying hydrochloric acid gas? [2] (a)
Write the products and balance the equation.
i. Magnesium metal is treated with dilute hydrochloric acid [1]
ii. Action of dilute sulphuric acid on sodium sulphite [1]
(b)
Arrange the following as per the instruction given in the brackets:
i. Mg
2+
, Cu
2+
, Na
+
, H
+ 
(In the order of preferential discharge at the cathode)
[1]
ii. He, Ar, Ne (Increasing order of the number of shells) [1]
iii. F, B, N, O (In the increasing order of electron affinity) [1]
(c)
Fill in the blanks by selecting the appropriate word from the given choice:
i. Ethanoic acid reacts with ethanol in presence of concentrated H
2
SO
4
, so as to form a
compound and water. The chemical reaction which takes place is called ________
(dehydration/esterification/hydrogenation).
[1]
ii. ________ is a cyclic hydrocarbon. [1]
iii. Calculate the ________ of the compound from its empirical formula. [1]
(d)
4. Question 4 [10]
What is the difference between the fluoride ion and neon atom even when the electronic configuration
of both are same?
[2] (a)
Calculate the mass of lime stone required to produce 112 kg of quicklime by burning it. [2] (b)
Give the chemical formula of:
i. Bauxite
ii. Cryolite
iii. Sodium aluminate
[3] (c)
Explain the following:
i. Copper is used to make hot water tanks and not steel. [1]
ii. People suffering from acidity are advised to drink cold milk. [1]
iii. Sea water is a strong electrolyte. [1]
(d)
5. Question 5 [10]
i. Solid which can be used instead of conc. sulphuric acid to prepare ethylene by the dehydration
of ethanol. Identify the substance.
[1]
(a)
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) Atomic radius increases and nuclear
charge increases
b) Atomic radius decreases and nuclear
charge decreases
c) Atomic radius increases and nuclear
charge decreases
d) Atomic radius decreases and nuclear
charge increases
Ionisation potential increases over a period from left to right because the ________. [1] (a)
a) 17 b) 11
c) 18 d) 20
An element with the atomic number 19 will most likely combine chemically with the element whose
atomic number is
[1] (b)
a) it has a high melting point b) it is easily vaporised
c) it often exists as a liquid d) it is a weak electrolyte
The property which is characteristic of an electrovalent compound is that [1] (c)
a) Sodium nitrate b) Copper nitrate
c) Zinc nitrate d) Lead nitrate
Dilute sulphuric acid will produce a white precipitate when added to a solution of ________. [1] (d)
a) neutralisation reaction b) decomposition reaction
c) combination reaction d) redox reaction
The reaction, which involves the formation of salts is [1] (e)
A metal hydroxide which is unsoluble in caustic but soluble in excess of NH
4
OH is [1] (f)
 Chemistry
a) Zn(OH)
2
b) O(OH)
2
c) CO(OH)
2
d) Cu(OH)
2
a) C
2
H
15
b) C
4
H
12
c) C
2
H
5
d) C
3
H
8
The empirical formula of butane is [1] (g)
a) 4M b) 2M
c) M d)
The vapour density of a gas A is four times that of B. If molecular mass of B is M, then molecular
mass of A is
[1] (h)
M 4 a) The electrons will flow from the
magnesium electrode to the copper
electrode
b) A gas will be given off at the
magnesium electrode
c) The bulb will light up d) A gas will be given off at the copper
electrode
A simple cell is set up with magnesium and copper as the electrodes and dilute sulphuric acid as the
electrolyte. Which of the following will not occur?
[1] (i)
a) H
2
SO
4
b) CaCO
3
c) SiO
2
d) Both CaO and SiO
2
An ore after levigation is found to have basic impurities. Which of the following can be used as flux
during smelting?
[1] (j)
a) Hydrogen sulphide b) Sulphur dioxide
c) Vapour of sulphuric acid d) Sulphur trioxide
When dilute sulphuric acid reacts with iron, sulphide, the gas evolved is: [1] (k)
a) AgNO
3
b) NH
3
c) H
2
SO
4
d) MnO
2
Which of the following is not used to detect hydrochloric acid? [1] (l)
a) Butane, 2-methylbutane, 2, 3-
dimethylbutane
b) Ethane, ethylene, acetylene
c) Methanol, ethanol, propanoic acid d) Ethane, propane, butanone
Which of the following forms a homologous series? [1] (m)
a) Wohler b) Haber
c) Berzelius d) Lavoisier
Urea was first obtained by heating ammonium cyanate by: [1] (n)
a) Cracking b) Catenation
The property of carbon to form chains and rings is called: [1] (o)
c) Hydrogenation d) Polymerization
2. Question 2 [25]
Reaction: 
a. Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
b. In the contact process for manufacture of the sulphuric acid, sulphur trioxide is not converted to
sulphuric by reacting it with water, instead two steps procedure is used. Write equation for the two
steps involved.
c. What type of substance will liberate dioxide from sodium sulphite?
d. Write the equation for the reaction, where sulphur dioxide is converted sodium sulphite in step F.
e. Name the process used in A.
f. What is the reaction involved in B?
[5] (a)
Match the salts given in Column I with their method of preparation given in Column II:
Column I Column II
(a) Pb(NO
3
)
2 
from PbO
(i) Simple displacement
(b) MgCl
2
 from Mg
(ii) Titration
(c) FeCl
3
 from Fe
(iii) Neutralisation
(d) NaNO
3
 from NaOH
(iv) Combination
[5] (b)
Complete the following by choosing the correct answers from the bracket:
i. Metals are good ________ (oxidizing agents/reducing agents) because they are electron
________ (acceptors/donors).
[1]
ii. The basicity of acetic acid is ________. (3, 1, 4) [1]
iii. A formula which shows the simplest whole number ratio is ________. [1]
iv. ________ the concentration of an ion in a solution, the greater is the probability of its being
discharged at its appropriate electrode.
[1]
v. Nitric acid is a strong ________ agent therefore it does not liberate hydrogen on reaction with
metals.
[1]
(c)
Identify the following:
i. Compound containing  functional group.
[1]
ii. A colourless gas that becomes reddish brown when it comes in contact with atmosphere. [1]
iii. The process of extraction of metals from its ores by electrolysis. [1]
iv. A compound which is soluble in water and the only negative ions in the solution are hydroxide
ions.
[1]
v. Metals form ________ chlorides. (Covalent/ionic) [1]
(d)
- - H C
| | O
Section B
Attempt any 4 questions
i. A compound made up of two elements X and Y has an empirical formula X
2
Y . If the atomic
weight of X is 10 and that of Y is 5 and the compound has a vapour density 25, find the
molecular formula.
[2]
ii. Draw the electron dot diagram for the compounds given below. Represent the electron by ( )
and ( ) in the diagram. [Atomic No.: Ca = 20, O = 8, Cl = 17, H = 1]
i. Calcium oxide
ii. Chlorine molecule
iii. Water molecule
[3]
(e)
· × 3. Question 3 [10]
Why phosphorous pentaoxide and quick lime cannot be used for drying hydrochloric acid gas? [2] (a)
Write the products and balance the equation.
i. Magnesium metal is treated with dilute hydrochloric acid [1]
ii. Action of dilute sulphuric acid on sodium sulphite [1]
(b)
Arrange the following as per the instruction given in the brackets:
i. Mg
2+
, Cu
2+
, Na
+
, H
+ 
(In the order of preferential discharge at the cathode)
[1]
ii. He, Ar, Ne (Increasing order of the number of shells) [1]
iii. F, B, N, O (In the increasing order of electron affinity) [1]
(c)
Fill in the blanks by selecting the appropriate word from the given choice:
i. Ethanoic acid reacts with ethanol in presence of concentrated H
2
SO
4
, so as to form a
compound and water. The chemical reaction which takes place is called ________
(dehydration/esterification/hydrogenation).
[1]
ii. ________ is a cyclic hydrocarbon. [1]
iii. Calculate the ________ of the compound from its empirical formula. [1]
(d)
4. Question 4 [10]
What is the difference between the fluoride ion and neon atom even when the electronic configuration
of both are same?
[2] (a)
Calculate the mass of lime stone required to produce 112 kg of quicklime by burning it. [2] (b)
Give the chemical formula of:
i. Bauxite
ii. Cryolite
iii. Sodium aluminate
[3] (c)
Explain the following:
i. Copper is used to make hot water tanks and not steel. [1]
ii. People suffering from acidity are advised to drink cold milk. [1]
iii. Sea water is a strong electrolyte. [1]
(d)
5. Question 5 [10]
i. Solid which can be used instead of conc. sulphuric acid to prepare ethylene by the dehydration
of ethanol. Identify the substance.
[1]
(a)
ii. Gas used for ripening of fruits. Identify the gas. [1]
Compare the properties of covalent and electrovalent compounds on the following points:
i. Solubility
ii. Structure
[2] (b)
Give balanced chemical equation for the following:
i. Reaction of Ammonia with heated copper oxide [1]
ii. Concentrated hydrochloric acid and potassium permanganate solution [1]
iii. Action of dilute sulphuric acid on zinc sulphide [1]
(c)
State one relevant observation for each of the following reactions:
i. Barium chloride solution is slowly added to sodium sulphate solution. [1]
ii. Ammonium hydroxide solution is added in excess to copper sulphate solution. [1]
iii. At the anode when aqueous copper sulphate solution is electrolysed using copper electrodes. [1]
(d)
6. Question 6 [10]
Observe the table and fill the blanks.
Li(7) Cl Ca(40)
- Br -
K(39) I Ba(137)
[2] (a)
Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C
3
H
8
). 
(Atomic mass of C = 12, O = 16, H = 1, Molar volume = 22.4 dm
3
 at STP)
[2] (b)
i. Name the main constituent of acetic acid.
ii. What is the effect of acetic acid on litmus paper?
iii. Write the name of the compound present in litmus which is responsible for its colour changes.
[3] (c)
There are three test tubes A, B and C containing copper sulphate solution, calcium nitrate solution and
zinc nitrate solution, respectively. Half of each solutions is treated with excess of sodium hydroxide
and rest half of each solution is treated with excess of ammonium hydroxide. Note down the
observation, precipitate formed initially and their solubility in excess.
[3] (d)
7. Question 7 [10]
Element X is a metal with a valency 2, Y is a non-metal with a valency 3.
i. Write an equation to show how Y forms on ion.
ii. If Y is a diatomic gas write an equation for the direct combination of X and Y to form a
compound.
[2] (a)
Oxygen oxidises ethyne to carbon dioxide and water as shown by the equation: 
2C
2
H
2
 + 5O
2
  4CO
2
 + 2H
2
O 
What volume of ethyne gas at STP is required to produce 8.4 dm
3
 of carbon dioxide at STP? (H = 1,
C = 12, O = 16)
[2] (b)
? Name the particles present in:
i. Strong electrolyte
ii. Non-electrolyte
iii. Weak electrolyte.
[3] (c)