ICSE 2026 CHEMISTRY MODEL PAPER
MODEL PAPER
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ICSE EXAMINATION
MODEL QUESTION PAPER
CHEMISTRY (SCIENCE PAPER – 2)-522
Maximum Marks: 80
Time allowed: Two hours
1. Answers to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 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 brackets [ ].
Section I (40 Marks)
Answer All the Questions
Question 1
Choose the correct answers to the following questions from the given options [15M]
i) An electropositive element has 3 electron shells and valency 3 belongs to:
a) period 3 and group 4 b) period 3 and group 13
c) period 3 and group 14 d) period 3 and group 15
ii) Dilute sulphuric acid contains these ions:
a) sulphate ions only b) Hydrogen ions and sulphate ions only
c) Hydrogen ions, hydroxyl and sulphate ions d) Hydrogen ions only
iii) In the formation of Sodium chloride:
iv) Cylinder ‘A’ contains 2 moles of Oxygen gas and cylinder ‘B’ contains 1 mole of Carbon dioxide gas ( at. wt. C-12, O-16) then:
a) Cylinder ‘A’ is heavier than ‘B’
b) Cylinder ‘A’ is lighter than ‘B’
c) Cylinder A is as heavier as B
d) cannot be compared
v) When a salt, with formula XY2 ( X is a metal and Y is a non-metal), is electrolysed in its fused state then:
a) X + ions go to cathode and get oxidized
b) X + ions go to cathode and get reduced
c) X +2 ions go to cathode and get reduced
d) X +2 ions go to cathode and get oxidized
vi) Which of the following compounds is not an ore of aluminium?
a) Bauxite ore b) Haematite ore c) Corrundum d) Cryolite
vii) Dilute Hydrochloric acid is added to Sodium sulphite followed by orange colour Potassium dichromate solution:
a) Orange colour changes to clear colouless
b) Orange colour changes to pink
c) Orange colour changes to clear green solution
d) No change in colour of the potassium dichromate solution
viii) Identify the compound ‘A’ and the role of ‘A’ in the following reaction:
C2H5OH + A 🡪 C2H4 + H2O
a) Conc. Sulphuric acid acts as a drying agent
b) dil. Sulphuric acid acts as a drying agent
c) dil. Sulphuric acid acts as an oxidizing agent
d) Conc. Sulphuric acid acts as a dehydrating agent
ix) This salt solution gives a gelatinous white ppt with Ammonium hydroxide and a white ppt with BaCl2 solution
a) ZnCl2 b) CaCl2 c) ZnSO4 d) FeSO4
x) The products obtained when ammonia gas reacts with excess Cl2 gas are:
a) Nitrogen trichloride + Hydrogen chloride b) Nitrogen trichloride + Hydrogen gas
c) Nitrogen trichloride + Nitrogen gas d) Ammonium chloride + Nitrogen gas
xi) The presence of this dissolved in Nitric acid gives it yellow tinge to Nitric acid:
a) Nitrogen gas b) Nitrogen dioxide gas c) Nitric oxide d) Oxygen gas
xii) Assertion: Conc. Nitric acid is a strong oxidizing agent
Reason: Conc. Nitric acid is unstable to heat.
a) Both Assertion and Reason are correct and Reason is the correct explanation for the assertion
b) Both Assertion and Reason are correct and Reason is not the correct explanation for the assertion
c) Assertion is correct but Reason is incorrect
d) Both Assertion and Reason are incorrect
xiii) A polar covalent compound is :
P- soluble in water Q- ionizes in its aqueous solution
R- cannot be electrolysed in its aqueous solution
a) Only P is correct b) both P and Q are correct
c) Only R is correct d) All P, Q and R are correct
xiv) Study the diagram and identify the mixture A + B taken in the test tube.
a) Ammonium chloride + Calcium hydroxide
b) Conc. Sulphuric acid + Sodium chloride
c) Ammonium nitrate + Calcium hydroxide
d) Conc. Sulphuric acid + Calcium hydroxide
xv) Assertion : Alkenes decolourise Bromine water.
Reason: Alkenes are unsaturated hydrocarbons
a) Both Assertion and Reason are correct and Reason is the correct explanation for the assertion
b) Both Assertion and Reason are correct and Reason is not the correct explanation for the assertion
c) Assertion is correct but Reason is incorrect
d) Both Assertion and Reason are incorrect
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Question 2
i) Ananya of Class 10 wants to prepare and collect Hydrogen chloride gas in the laboratory. She made the set up as shown in the below diagram.
a) Write the balanced equation for the reaction involved in the above process.
b) What is the suitable temperature for this process in laboratory method? Give reason for the same.[2M]
c) At the end of the process Ananya realized that HCl gas has not been collected in the jar ‘J’. What is wrong with the set up here? what change do you suggest to Ananya so that she can obtain HCl gas in the gas jar ‘J’?[2M]
ii) Fill in the blanks. 5M
a) Nuclear pull on the valence electrons _______________ (increase/decreases) across a period as the atomic size _______________ (increase/decreses).
b) In the formation of Oxygen molecule each Oxygen atom gives ___________ electrons (one/ two) for the covalent bond.
c) _____________ ( Cu2+/ Ag+/ K+) is most difficult to get reduced.
d) Sulpuric acid can produce two types of salts because it is a ____________ (strong/ dibasic) acid.
e) Duralumin is an alloy of _____________ ( Zinc/ Aluminium).
iii) Match the following ( Do NOT repeat the answer) [5M]
a) Contact process 1) Preparation of alkane
b) Decarboxylation 2) Dressing of Bauxite ore
c) Dehydration of Ethyl alcohol 3) Production of Sulphuric acid
d) Esterification 4) Preparation of Ethene
e) Baeryer’s process 5) gives a sweet smell
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iv) Select the correct answer from the list of words given in brackets
[ Sulphur dioxide, Amphoteric, Ionisation potential, Alkyne, Hydronium ion, Chlorine gas, Hydroxyl ion]
[5M]
a) The ion present in the aqueous solution of an acid, other than acid radical.
b) Zinc metal reacts with conc. Sodium hydroxide to produce Hydrogen gas due to this property of
Zinc.
c) A greenish yellow gas which turns moist blue litmus to red then bleaches it
d) An organic compound with molecular formula C4H6 belongs to this homologous series.
e) The minimum energy required to remove one electron from the valence shell of an atom of an element.
v) The following reaction is the oxidation of Ammonia gas with Oxygen gas to produce Nitric oxide.
4NH3 + 5O2 🡪 4NO + 6H2O
If 4 volumes of Ammonia requires 5 volumes of Oxygen gas for the above reaction, then find the volume of Ammonia gas that can be oxidized by 200 lit of Oxygen gas. State one industrial application of the above reaction. [2M]
vi) Write the IUPAC names of the following organic compounds [3M]
Section B (40Marks)
Answer any FOUR questions
Question 3
i) Three elements P,Q and R have their electro-negativity as shown in the table
[3M]
a) Which element has least ionization potential?
b) Which two elements can form an ionic bond between them?
c) Arrange these elements in the decreasing order of their oxidizing property.
ii) ‘A’ and ‘B’ are two elements with belong to the period in which Sodium is present. ‘A’ and ‘B’ have 4
and 7 valence electrons respectively. Then answer the following questions. [4M]
a) Compare the atomic size of ‘A’ and ‘B’
b) What type of bond is formed between Sodium and the element ‘B’?
c) Show the formation of the compound between the elements ‘A’ and ‘B’ by electron dot representation. DO NOT identify A and B
iii) Give reason [3M]
a) HCl is a polar covalent molecule but Cl2 molecules is non-polar.
b) Helium highest Ionization potential
c) Ionic compounds have high melting point but covalent compounds have low melting point.
Question 4
i) Write balanced equation for the following reactions: [3M]
a) Neutralization of Sodium hydrogen carbonate using dilute Hydrochloric acid.
b) Prepare Lead chloride from Lead Oxide in 2 steps.
ii) The electron dot diagram given aside represents a basic radical . [3M]
a) In this radical contains three __________ bonds and one ___________ bond
b) How many valence electrons does the element ‘X’ have in its
atom before chemical combination ?
iii) The pH values of fourdifferent solutions given in the below table
a)Which of these solutions can produce Sulphur dioxide gas from a metal sulphite? [1M]
b) Compare the concentration of Hydronium ions in the solutions B and D. [1M]
c) Name the neagtive ions present the solution ‘A’. [1M]
d) Which of the above solutions gives green colour with pH solution. [1M]
Question 5
i) Akshara of Grade 10 found that her key chain is losing its shine and getting covered with a brownish layer on it. She realised that it is because the key chain is made of Iron which easily gets oxidised in the air. So, she decides to protect it as she does not want to discard it because it was a gift from her grand mother. She wants to put a Silver coating on the key chain using the set-up given below.
The diagram given along side is the arrangemant of the set-up of a perticular process. [4M]
a) Name the process shown above.
b) What must be the Electrolyte used in this process ?
c) Write anode reaction
d) After the set-up is ready, she turns the switch on for sometime and then turns it off thinking the process is complete. Do you think the article gets a proper coating of Silver on it? Justify your answer.
ii) Answer the following questions pertaining to the electrolysis of Copper sulphate solution using Copper electrodes: [3M]
a) Which cation gets reduced at cathode between H+ and Cu2+ ? Give a reason for the same.
b) Write the balanced equation for the Anode reaction
c) What would be the product formed at anode if platinum electrodes are used in the above process.
iii) a) Which of these two ores can be converted to the corresponding metal oxide by calcinations? [1M]
(Zinc blende/ Calamine)
b) Name the compound, other than cryolite, added to Alumina in Hall-Heroult’s process . [1M]
c) Give a suitable reason why Carbon is added to Iron to make stainless steel. [1M]
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Question 6
i)Two cylinders of equal volumes are taken where one cylinder is filled with a gas ‘A’ and the other cylinder is filled with gas ’B’. If both the cylinders are maintained at S.T.P
[3M]
a) Compare the number of moles of those gases taken in the cylinders
b) State the law associated with this question
ii) 21.2 g of a chemical compound contains 9.2g of Sodium, 2.4g of Carbon and remaining is Oxygen.
given atomic weights Na-23, C-12, O-16.
a) Calculate the empirical formula of that compound.
b) Find the Molecular formula if n=1
c) Name the gas produced when the above compound reacts with dilute Sulphuric acid. [3M]
iii) Nitric acid can be prepared using Potassium nitrate and Conc. Sulphuric acid in laboratory method by the following recation
KNO3 + H2SO4 (conc.) 🡪 HNO3 + KHSO4
If two moles of Nitric acid has to be produced then calculate
a) mass of Potassium nitrate required
b) State any one precaution to be taken in this method of preparation
c) How do you test Nitric acid produced in this lab preparation? [3M]
iv) a) write a balanced equation for the preparation of Ethane gas from Sodium propanoate. [1M]
b) Calculate the volume of Carbon dioxide produced when 100ml of Ethane gas is burnt in presence
of sufficient Oxygen gas. 2C2H6 + 7O2 🡪 4CO2 + 6H2O [1M]
Question 7
i) Prasidh, student of grade 10, was given a salt ‘S’ for qualitative analysis in chemistry practical exam. He carried out the cation analysis and anion analysis and then recorded his observations in the table as shown below. [3M]
a) The Anion present in the salt is _____________
b) Write the chemical formula of that salt ‘S’.
c) )What would be the appropriate observation when the following steps are followed.
- Aqueous solution of salt ‘ S’ is added to dilute Nitric acid
- A few drops of Conc. Sulphuric acid added to the above mixture along the test tube wall.
ii) This diagram illustrates an experiment to prove a specific property of a particular gas. A blue fountain is observed in this experiment. Study the diagram carefully and answer the following questions:
a) Name the gas ‘X’
b) What is the purpose of this experiment ?
c) Which solution will be obtained in the round bottom at the end of the experiment if distilled water is taken instead of red litmus solution? [3M]
iii) Identify the property shown by the underlined Compound in each of the following reactions. [4M]
a) 3CuO + 2NH3 (g) 🡪 3Cu + N2 + 3H2O
b) S + 6HNO3 (conc.) 🡪 H2SO4 + 6NO2 + 3H2O
c) 2NaOH + H2 SO4 (dil.) 🡪 Na2SO4 + 2H2O
d) 4HCl + MnO2 🡪 MnCl2 + 2H2O + Cl2
Question 8
i) Write balanced equations for the following reactions (with all necessary conditions) [4M]
a) Reaction involved in Haber’s process
b) Catalytic oxidation of Ammonia gas
c) Oxidation of Carbon by Conc. Nitric acid
d) Convert Ethene to 1,2-dichloro ethane
ii) Identify and name the compounds ‘P’ and ‘Q’ and re-write the balanced equations [2M]
a) CH3COOH + P Conc.Sulphuric acid→ CH3COOC2H5 + H2O
b) Q + H2 Nickel→ Ethane
iii) Draw the possible position isomers of Propanol (C3H7OH) and give their IUPAC names [2M]
iv) a) Give the IUPAC name of the alkyne which is used in artificial ripening of fruits ( not a safe method
as it causes cancer) [1M]
b)Draw the structure of the organic acid which is present in Vinegar. [1M]
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