ICSE 2026 EXAINATION
CHEMISTRY (Science Paper – 2)
SAMPLE PAPER – 1
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 in reading the question
paper.
The time given at the head of this paper is the time allowed for writing the answers.
This question paper is divided into two sections:
Section A (40 Marks): Compulsory - All questions are to be attempted.
Section B (40 Marks): Attempt any four questions from this section.
Answers should be brief and to the point.
The intended marks for questions or parts of questions are given in brackets [ ].
All chemical equations should be balanced and the physical states of reactants and products must be
indicated where necessary.
SECTION - A (iv)
(Attempt all questions in this section)
(40 Marks)
Question 1
Choose the correct answer to the questions from the
given options. [15]
(i) An element X has a valency of 3+ while
element Y has a valency of 2-. The formula of the
compound formed between X and Y will be:
(a) X₂Y
(b) X₂Y₃ Observe the given diagram showing the action of
(c) X₃Y₂ Sodium Hydroxide solution on two different salt
(d) XY [Understanding] solutions. The cations present in the two salt
solutions are respectively:
(ii) In the extraction of aluminium by the Hall- (a) Fe²⁺ and Fe³⁺
Héroult process, the function of cryolite is to: (b) Fe³⁺ and Fe²⁺
(a) act as a reducing agent (c) Cu²⁺ and Fe²⁺
(b) increase the electrical conductivity and lower the (d) Pb²⁺ and Al³⁺
melting point of alumina [Analysis]
(c) remove impurities from bauxite
(d) form a protective layer on the molten aluminium (v) The element which does not belong to the same
[Recall] period of the periodic table as the others is:
(a) Na
(iii) Which of the following compounds will (b) Cl
conduct an electric current in its aqueous solution? (c) Ca
(a) Carbon tetrachloride (d) N
(b) Glucose [Understanding]
(c) Sodium chloride
(d) Urea [Recall]
,(vi) An example of a salt that is insoluble in cold (xii) Which of the following is a monobasic acid?
water but soluble in hot water is: (a) Sulphuric acid
(a) Sodium chloride (b) Phosphoric acid
(b) Lead chloride (c) Nitric acid
(c) Potassium nitrate (d) Carbonic acid
(d) Silver chloride [Understanding]
[Recall]
(xiii)
(vii) Assertion (A): Ammonia gas is not collected
over water.
Reason (R): Ammonia is highly soluble in water.
(a) Both A and R are true, and R is the correct
explanation of A.
(b) Both A and R are true, but R is not the correct
explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
[Analysis]
The given diagram represents the electrolytic
(viii) The IUPAC name of the compound with the refining of copper. What is the electrolyte used in
structural formula CH₃ - CH₂ - CH₂ - CHO is: this process?
(a) Butanol (a) Fused copper chloride
(b) Butanal (b) Dilute sulphuric acid
(c) Butanone (c) Aqueous copper sulphate solution with a little
(d) Butanoic acid sulphuric acid
[Recall] (d) Copper oxide solution
[Analysis]
(ix) In the contact process for the manufacture of
sulphuric acid, the catalyst used is: (xiv) Assertion (A): Graphite is used as a lubricant.
(a) Platinum or Vanadium pentoxide Reason (R): Graphite has layers of carbon atoms
(b) Nickel that can slide over each other.
(c) Manganese dioxide (a) Both A and R are true, and R is the correct
(d) Iron explanation of A.
[Recall] (b) Both A and R are true, but R is not the correct
explanation of A.
(x) When zinc carbonate is heated strongly in the (c) A is true, but R is false.
absence of air, the residue left behind is: (d) A is false, but R is true.
(a) Zinc metal [Analysis]
(b) Zinc oxide
(c) Zinc hydroxide (xv) The volume of gases at STP in the reaction:
(d) Zinc N₂(g) + 3H₂(g) → 2NH₃(g), if 2 moles of N₂ and 6
[Understanding] moles of H₂ are completely reacted, will be:
(a) 22.4 L of NH₃
(xi) The number of shared electrons in a molecule (b) 44.8 L of NH₃
of nitrogen (N₂) is: (c) 67.2 L of NH₃
(a) 2 (d) 89.6 L of NH₃
(b) 4 [Application]
(c) 6
(d) 8
[Recall]
, Question 2 [25] (c) The ion responsible for the basic properties of a
(i) With reference to the diagram given below, compound is the __________. [Recall]
answer the questions that follow: [5] (d) __________ chloride is a salt that undergoes
__________ when heated, changing directly from
solid to gas. [Analysis]
(iv) Match Column A with Column B: [5]
Column A Column B
1. Oleum A. Used in photography
2. Aqua regia B. HNO₃ + 3HCl
3. Silver bromide C. H₂S₂O₇
(a) Identify the gas being prepared in the above 4. Galena D. Fe₃O₄
apparatus. [Recall] 5. Magnetic E. PbS
(b) What is the purpose of the U-tube containing oxide
quicklime? [Recall] F. NH₃
(c) Why is the gas jar kept in an inverted [Recall]
position for collecting the gas? [Understanding]
(d) Write the balanced chemical equation for the (v) (a) Give the IUPAC names of the organic
reaction taking place in the hard glass test tube. compounds represented by the diagrams
[Recall] below: [2½]
(e) Why is this gas not collected over water? (i)
[Recall]
(ii) Identify the following: [5]
(a) A gas which turns acidified potassium
dichromate paper from orange to green.
[Recall]
(b) The process by which concentrated sulphuric
acid removes water from organic compounds like
sugar. [Recall]
(c) The term used for the chemical bond formed
between two atoms by the mutual sharing of (ii)
electrons. [Recall]
(d) A compound of nitrogen which is used as a H
refrigerant. [Recall]
(e) The metal which is protected from corrosion by
the formation of a protective oxide layer (self-
protection). [Recall]
H
(iii) Complete the following by choosing the
correct answers from the bracket: [5]
H
[hydroxide ion, anhydrous, hydrogen ion,
sublimation, ammonium, hydration]
(a) According to the Arrhenius theory, an acid (b) Draw the structural diagrams for the
produces __________ in water. [Recall] following compounds: [2½]
(b) The process of absorbing moisture from the air (i) Propane
to become liquid is called deliquescence, while the (ii) Propene
chemical combination of water molecules with a (iii) Ammonium ion (NH₄⁺) showing coordinate
substance is called __________. [Recall] bond [Application]
CHEMISTRY (Science Paper – 2)
SAMPLE PAPER – 1
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 in reading the question
paper.
The time given at the head of this paper is the time allowed for writing the answers.
This question paper is divided into two sections:
Section A (40 Marks): Compulsory - All questions are to be attempted.
Section B (40 Marks): Attempt any four questions from this section.
Answers should be brief and to the point.
The intended marks for questions or parts of questions are given in brackets [ ].
All chemical equations should be balanced and the physical states of reactants and products must be
indicated where necessary.
SECTION - A (iv)
(Attempt all questions in this section)
(40 Marks)
Question 1
Choose the correct answer to the questions from the
given options. [15]
(i) An element X has a valency of 3+ while
element Y has a valency of 2-. The formula of the
compound formed between X and Y will be:
(a) X₂Y
(b) X₂Y₃ Observe the given diagram showing the action of
(c) X₃Y₂ Sodium Hydroxide solution on two different salt
(d) XY [Understanding] solutions. The cations present in the two salt
solutions are respectively:
(ii) In the extraction of aluminium by the Hall- (a) Fe²⁺ and Fe³⁺
Héroult process, the function of cryolite is to: (b) Fe³⁺ and Fe²⁺
(a) act as a reducing agent (c) Cu²⁺ and Fe²⁺
(b) increase the electrical conductivity and lower the (d) Pb²⁺ and Al³⁺
melting point of alumina [Analysis]
(c) remove impurities from bauxite
(d) form a protective layer on the molten aluminium (v) The element which does not belong to the same
[Recall] period of the periodic table as the others is:
(a) Na
(iii) Which of the following compounds will (b) Cl
conduct an electric current in its aqueous solution? (c) Ca
(a) Carbon tetrachloride (d) N
(b) Glucose [Understanding]
(c) Sodium chloride
(d) Urea [Recall]
,(vi) An example of a salt that is insoluble in cold (xii) Which of the following is a monobasic acid?
water but soluble in hot water is: (a) Sulphuric acid
(a) Sodium chloride (b) Phosphoric acid
(b) Lead chloride (c) Nitric acid
(c) Potassium nitrate (d) Carbonic acid
(d) Silver chloride [Understanding]
[Recall]
(xiii)
(vii) Assertion (A): Ammonia gas is not collected
over water.
Reason (R): Ammonia is highly soluble in water.
(a) Both A and R are true, and R is the correct
explanation of A.
(b) Both A and R are true, but R is not the correct
explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
[Analysis]
The given diagram represents the electrolytic
(viii) The IUPAC name of the compound with the refining of copper. What is the electrolyte used in
structural formula CH₃ - CH₂ - CH₂ - CHO is: this process?
(a) Butanol (a) Fused copper chloride
(b) Butanal (b) Dilute sulphuric acid
(c) Butanone (c) Aqueous copper sulphate solution with a little
(d) Butanoic acid sulphuric acid
[Recall] (d) Copper oxide solution
[Analysis]
(ix) In the contact process for the manufacture of
sulphuric acid, the catalyst used is: (xiv) Assertion (A): Graphite is used as a lubricant.
(a) Platinum or Vanadium pentoxide Reason (R): Graphite has layers of carbon atoms
(b) Nickel that can slide over each other.
(c) Manganese dioxide (a) Both A and R are true, and R is the correct
(d) Iron explanation of A.
[Recall] (b) Both A and R are true, but R is not the correct
explanation of A.
(x) When zinc carbonate is heated strongly in the (c) A is true, but R is false.
absence of air, the residue left behind is: (d) A is false, but R is true.
(a) Zinc metal [Analysis]
(b) Zinc oxide
(c) Zinc hydroxide (xv) The volume of gases at STP in the reaction:
(d) Zinc N₂(g) + 3H₂(g) → 2NH₃(g), if 2 moles of N₂ and 6
[Understanding] moles of H₂ are completely reacted, will be:
(a) 22.4 L of NH₃
(xi) The number of shared electrons in a molecule (b) 44.8 L of NH₃
of nitrogen (N₂) is: (c) 67.2 L of NH₃
(a) 2 (d) 89.6 L of NH₃
(b) 4 [Application]
(c) 6
(d) 8
[Recall]
, Question 2 [25] (c) The ion responsible for the basic properties of a
(i) With reference to the diagram given below, compound is the __________. [Recall]
answer the questions that follow: [5] (d) __________ chloride is a salt that undergoes
__________ when heated, changing directly from
solid to gas. [Analysis]
(iv) Match Column A with Column B: [5]
Column A Column B
1. Oleum A. Used in photography
2. Aqua regia B. HNO₃ + 3HCl
3. Silver bromide C. H₂S₂O₇
(a) Identify the gas being prepared in the above 4. Galena D. Fe₃O₄
apparatus. [Recall] 5. Magnetic E. PbS
(b) What is the purpose of the U-tube containing oxide
quicklime? [Recall] F. NH₃
(c) Why is the gas jar kept in an inverted [Recall]
position for collecting the gas? [Understanding]
(d) Write the balanced chemical equation for the (v) (a) Give the IUPAC names of the organic
reaction taking place in the hard glass test tube. compounds represented by the diagrams
[Recall] below: [2½]
(e) Why is this gas not collected over water? (i)
[Recall]
(ii) Identify the following: [5]
(a) A gas which turns acidified potassium
dichromate paper from orange to green.
[Recall]
(b) The process by which concentrated sulphuric
acid removes water from organic compounds like
sugar. [Recall]
(c) The term used for the chemical bond formed
between two atoms by the mutual sharing of (ii)
electrons. [Recall]
(d) A compound of nitrogen which is used as a H
refrigerant. [Recall]
(e) The metal which is protected from corrosion by
the formation of a protective oxide layer (self-
protection). [Recall]
H
(iii) Complete the following by choosing the
correct answers from the bracket: [5]
H
[hydroxide ion, anhydrous, hydrogen ion,
sublimation, ammonium, hydration]
(a) According to the Arrhenius theory, an acid (b) Draw the structural diagrams for the
produces __________ in water. [Recall] following compounds: [2½]
(b) The process of absorbing moisture from the air (i) Propane
to become liquid is called deliquescence, while the (ii) Propene
chemical combination of water molecules with a (iii) Ammonium ion (NH₄⁺) showing coordinate
substance is called __________. [Recall] bond [Application]
