ICSE Chemistry Past Year Paper with Solutions - 2024 | Chemistry Class 10 ICSE PDF Download

 Page 1


Chemistry 
CISCE 
Academic Year: 2023-2024 
(English Medium) 
Date & Time: 11th March 2024, 11:00 am 
 
Duration: 2h                                                                                                     Marks: 100 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the ??rst 15 minutes. 
3. This time is to be spent in reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the 
answers. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackects  
[ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Q1. Choose the correct answers to the questions from the given options. (Do not copy 
the questions, write the correct answers only.) 
1.1. The unsaturated hydrocarbons undergo ______. 
1. A substitution reaction 
2. An oxidation reaction 
3. An addition reaction 
4.  None of the above 
5. Redox reaction 
Solution 
The unsaturated hydrocarbons undergo an addition reaction. 
Explanation: 
Page 2


Chemistry 
CISCE 
Academic Year: 2023-2024 
(English Medium) 
Date & Time: 11th March 2024, 11:00 am 
 
Duration: 2h                                                                                                     Marks: 100 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the ??rst 15 minutes. 
3. This time is to be spent in reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the 
answers. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackects  
[ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Q1. Choose the correct answers to the questions from the given options. (Do not copy 
the questions, write the correct answers only.) 
1.1. The unsaturated hydrocarbons undergo ______. 
1. A substitution reaction 
2. An oxidation reaction 
3. An addition reaction 
4.  None of the above 
5. Redox reaction 
Solution 
The unsaturated hydrocarbons undergo an addition reaction. 
Explanation: 
Because double and triple bonds in unsaturated hydrocarbons are broken down into 
single bonds, they are subject to addition reactions. 
1.2. In the 2
nd
 period Neon has maximum Ionization Potential because ______. 
1. It has unstable electronic con??guration. 
2. It easily accepts electrons. 
3. It easily loses electrons. 
4. The outer most shell is completely ??lled. 
Solution 
In the 2
nd
 period Neon has maximum Ionization Potential because the outer most 
shell is completely ??lled . 
Explanation: 
Neon's valence shell is completely ??lled, making it extremely stable and requiring 
more energy to remove an electron, giving it the highest ionisation potential in the 
second period. 
1.3. Copper, zinc, and Tin are the metals alloyed to form ______. 
1. Duralumin 
2. Brass 
3. Bronze 
4. Solder 
Solution 
Copper, zinc, and Tin are the metals alloyed to form bronze. 
Explanation: 
Duralumin consists of 90% Al and 4% Cu, while bronze is an alloy with 80% Cu, 4% Zn, 
and 16% Sn. Cu and Zn combine to form brass. Pb and Sn are alloyed using solder. 
1.4. The metal hydroxide which reacts with both acids and alkalis to form salt and 
water is ______. 
1. Calcium hydroxide 
Page 3


Chemistry 
CISCE 
Academic Year: 2023-2024 
(English Medium) 
Date & Time: 11th March 2024, 11:00 am 
 
Duration: 2h                                                                                                     Marks: 100 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the ??rst 15 minutes. 
3. This time is to be spent in reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the 
answers. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackects  
[ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Q1. Choose the correct answers to the questions from the given options. (Do not copy 
the questions, write the correct answers only.) 
1.1. The unsaturated hydrocarbons undergo ______. 
1. A substitution reaction 
2. An oxidation reaction 
3. An addition reaction 
4.  None of the above 
5. Redox reaction 
Solution 
The unsaturated hydrocarbons undergo an addition reaction. 
Explanation: 
Because double and triple bonds in unsaturated hydrocarbons are broken down into 
single bonds, they are subject to addition reactions. 
1.2. In the 2
nd
 period Neon has maximum Ionization Potential because ______. 
1. It has unstable electronic con??guration. 
2. It easily accepts electrons. 
3. It easily loses electrons. 
4. The outer most shell is completely ??lled. 
Solution 
In the 2
nd
 period Neon has maximum Ionization Potential because the outer most 
shell is completely ??lled . 
Explanation: 
Neon's valence shell is completely ??lled, making it extremely stable and requiring 
more energy to remove an electron, giving it the highest ionisation potential in the 
second period. 
1.3. Copper, zinc, and Tin are the metals alloyed to form ______. 
1. Duralumin 
2. Brass 
3. Bronze 
4. Solder 
Solution 
Copper, zinc, and Tin are the metals alloyed to form bronze. 
Explanation: 
Duralumin consists of 90% Al and 4% Cu, while bronze is an alloy with 80% Cu, 4% Zn, 
and 16% Sn. Cu and Zn combine to form brass. Pb and Sn are alloyed using solder. 
1.4. The metal hydroxide which reacts with both acids and alkalis to form salt and 
water is ______. 
1. Calcium hydroxide 
2. Magnesium hydroxide 
3. Aluminium hydroxide 
4. Ferric hydroxide 
Solution 
The metal hydroxide which reacts with both acids and alkalis to form salt and water 
is aluminium hydroxide. 
Explanation: 
Because Al (OH) 3 is amphoteric in nature, it can generate salt and water as well as 
behave as a base with a strong acid. 
1.5. Reaction of an alcohol with a carboxylic acid in the presence of 
concentrated H 2SO 4 is termed as ______. 
1. Halogenation 
2. Esteri??cation 
3. Hydrogenation 
4. Dehydrohalogenation 
Solution 
Reaction of an alcohol with a carboxylic acid in the presence of concentrated H 2SO 4 is 
termed as esteri??cation . 
Explanation: 
The process that produces an ester when an alcohol reacts with carboxylic acid in the 
presence of H 2SO 4 is known as an esteri??cation reaction. 
 
1.6. Conversion of ethanol to ethene by the action of concentrated sulphuric acid is 
an example of _________. 
1. Dehydration 
Page 4


Chemistry 
CISCE 
Academic Year: 2023-2024 
(English Medium) 
Date & Time: 11th March 2024, 11:00 am 
 
Duration: 2h                                                                                                     Marks: 100 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the ??rst 15 minutes. 
3. This time is to be spent in reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the 
answers. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackects  
[ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Q1. Choose the correct answers to the questions from the given options. (Do not copy 
the questions, write the correct answers only.) 
1.1. The unsaturated hydrocarbons undergo ______. 
1. A substitution reaction 
2. An oxidation reaction 
3. An addition reaction 
4.  None of the above 
5. Redox reaction 
Solution 
The unsaturated hydrocarbons undergo an addition reaction. 
Explanation: 
Because double and triple bonds in unsaturated hydrocarbons are broken down into 
single bonds, they are subject to addition reactions. 
1.2. In the 2
nd
 period Neon has maximum Ionization Potential because ______. 
1. It has unstable electronic con??guration. 
2. It easily accepts electrons. 
3. It easily loses electrons. 
4. The outer most shell is completely ??lled. 
Solution 
In the 2
nd
 period Neon has maximum Ionization Potential because the outer most 
shell is completely ??lled . 
Explanation: 
Neon's valence shell is completely ??lled, making it extremely stable and requiring 
more energy to remove an electron, giving it the highest ionisation potential in the 
second period. 
1.3. Copper, zinc, and Tin are the metals alloyed to form ______. 
1. Duralumin 
2. Brass 
3. Bronze 
4. Solder 
Solution 
Copper, zinc, and Tin are the metals alloyed to form bronze. 
Explanation: 
Duralumin consists of 90% Al and 4% Cu, while bronze is an alloy with 80% Cu, 4% Zn, 
and 16% Sn. Cu and Zn combine to form brass. Pb and Sn are alloyed using solder. 
1.4. The metal hydroxide which reacts with both acids and alkalis to form salt and 
water is ______. 
1. Calcium hydroxide 
2. Magnesium hydroxide 
3. Aluminium hydroxide 
4. Ferric hydroxide 
Solution 
The metal hydroxide which reacts with both acids and alkalis to form salt and water 
is aluminium hydroxide. 
Explanation: 
Because Al (OH) 3 is amphoteric in nature, it can generate salt and water as well as 
behave as a base with a strong acid. 
1.5. Reaction of an alcohol with a carboxylic acid in the presence of 
concentrated H 2SO 4 is termed as ______. 
1. Halogenation 
2. Esteri??cation 
3. Hydrogenation 
4. Dehydrohalogenation 
Solution 
Reaction of an alcohol with a carboxylic acid in the presence of concentrated H 2SO 4 is 
termed as esteri??cation . 
Explanation: 
The process that produces an ester when an alcohol reacts with carboxylic acid in the 
presence of H 2SO 4 is known as an esteri??cation reaction. 
 
1.6. Conversion of ethanol to ethene by the action of concentrated sulphuric acid is 
an example of _________. 
1. Dehydration 
2. Dehydrogenation 
3. Dehydrohalogenation 
4. Hydrolysis 
Solution 
Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an 
example of dehydration. 
Explanation: 
Conc. H 2SO 4 is a useful dehydrator since it turns alcohol into an alkene by removing 
the water molecule. 
 
1.7. The oxidizing agent in the equation S + 2H 2SO 4 ? 3SO 2 + 2H 2O is ______. 
1. Sulphur 
2. Sulphuric acid 
3. Sulphur dioxide 
4. Water 
Solution 
The oxidizing agent in the equation S + 2H 2SO 4 ? 3SO 2 + 2H 2O is sulphuric acid. 
Explanation: 
The reaction is as follows: 
S + 2H 2SO 4 (conc.) ? 3SO 2 + 2H 2O 
The oxidizing agent in this process is concentrated H 2SO 4. While being converted 
to SO 2, it oxidizes sulphur (S) to produce sulphur dioxide SO 2. 
Page 5


Chemistry 
CISCE 
Academic Year: 2023-2024 
(English Medium) 
Date & Time: 11th March 2024, 11:00 am 
 
Duration: 2h                                                                                                     Marks: 100 
1. Answers to this Paper must be written on the paper provided separately. 
2. You will not be allowed to write during the ??rst 15 minutes. 
3. This time is to be spent in reading the question paper. 
4. The time given at the head of this Paper is the time allowed for writing the 
answers. 
5. Section A is compulsory. Attempt any four questions from Section B. 
6. The intended marks for questions or parts of questions are given in brackects  
[ ]. 
SECTION-A (40 Marks) (Attempt all questions from this Section.) 
Q1. Choose the correct answers to the questions from the given options. (Do not copy 
the questions, write the correct answers only.) 
1.1. The unsaturated hydrocarbons undergo ______. 
1. A substitution reaction 
2. An oxidation reaction 
3. An addition reaction 
4.  None of the above 
5. Redox reaction 
Solution 
The unsaturated hydrocarbons undergo an addition reaction. 
Explanation: 
Because double and triple bonds in unsaturated hydrocarbons are broken down into 
single bonds, they are subject to addition reactions. 
1.2. In the 2
nd
 period Neon has maximum Ionization Potential because ______. 
1. It has unstable electronic con??guration. 
2. It easily accepts electrons. 
3. It easily loses electrons. 
4. The outer most shell is completely ??lled. 
Solution 
In the 2
nd
 period Neon has maximum Ionization Potential because the outer most 
shell is completely ??lled . 
Explanation: 
Neon's valence shell is completely ??lled, making it extremely stable and requiring 
more energy to remove an electron, giving it the highest ionisation potential in the 
second period. 
1.3. Copper, zinc, and Tin are the metals alloyed to form ______. 
1. Duralumin 
2. Brass 
3. Bronze 
4. Solder 
Solution 
Copper, zinc, and Tin are the metals alloyed to form bronze. 
Explanation: 
Duralumin consists of 90% Al and 4% Cu, while bronze is an alloy with 80% Cu, 4% Zn, 
and 16% Sn. Cu and Zn combine to form brass. Pb and Sn are alloyed using solder. 
1.4. The metal hydroxide which reacts with both acids and alkalis to form salt and 
water is ______. 
1. Calcium hydroxide 
2. Magnesium hydroxide 
3. Aluminium hydroxide 
4. Ferric hydroxide 
Solution 
The metal hydroxide which reacts with both acids and alkalis to form salt and water 
is aluminium hydroxide. 
Explanation: 
Because Al (OH) 3 is amphoteric in nature, it can generate salt and water as well as 
behave as a base with a strong acid. 
1.5. Reaction of an alcohol with a carboxylic acid in the presence of 
concentrated H 2SO 4 is termed as ______. 
1. Halogenation 
2. Esteri??cation 
3. Hydrogenation 
4. Dehydrohalogenation 
Solution 
Reaction of an alcohol with a carboxylic acid in the presence of concentrated H 2SO 4 is 
termed as esteri??cation . 
Explanation: 
The process that produces an ester when an alcohol reacts with carboxylic acid in the 
presence of H 2SO 4 is known as an esteri??cation reaction. 
 
1.6. Conversion of ethanol to ethene by the action of concentrated sulphuric acid is 
an example of _________. 
1. Dehydration 
2. Dehydrogenation 
3. Dehydrohalogenation 
4. Hydrolysis 
Solution 
Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an 
example of dehydration. 
Explanation: 
Conc. H 2SO 4 is a useful dehydrator since it turns alcohol into an alkene by removing 
the water molecule. 
 
1.7. The oxidizing agent in the equation S + 2H 2SO 4 ? 3SO 2 + 2H 2O is ______. 
1. Sulphur 
2. Sulphuric acid 
3. Sulphur dioxide 
4. Water 
Solution 
The oxidizing agent in the equation S + 2H 2SO 4 ? 3SO 2 + 2H 2O is sulphuric acid. 
Explanation: 
The reaction is as follows: 
S + 2H 2SO 4 (conc.) ? 3SO 2 + 2H 2O 
The oxidizing agent in this process is concentrated H 2SO 4. While being converted 
to SO 2, it oxidizes sulphur (S) to produce sulphur dioxide SO 2. 
1.8. Electron A??nity is maximum in ______. 
1. Mg 
2. Ar 
3. Li 
4. Br 
Solution 
Electron A??nity is maximum in Br. 
Explanation: 
From left to right in the periodic table, electron a??nity generally increases because 
atoms become more prone or unstable to gaining an electron in order to achieve a 
stable electronic con??guration, such as that of noble gases. Because they need one 
electron to complete their octet, halogens such as bromine (Br) have an excessively 
high electron a??nity. Metals like magnesium (Mg) and lithium (Li) have lesse r 
propensities to lose electrons than noble gases like argon (Ar), which have entire 
outer shells. 
1.9. The compound that is not a constituent of the electrolytic mixture used in Hall-
Heroult's process is ______. 
1. Al 2O 3 
2. NaAlO 2 
3. Na 3AlF 6 
4. CaF 2 
Solution 
The compound that is not a constituent of the electrolytic mixture used in Hall-
Heroult's process is NaAlO 2. 
Explanation: 
Aluminum from aluminum oxide is extracted using the Hall-Heroult technique 
(alumina, Al 2O 3). In order to lower the melting point of alumina and increase the 
conductivity of the solution, an electrolytic mixture made primarily of molten