ICSE Class 10 Chemistry Pre Board Question Paper 2026: Important Questions for High Marks

Particulars

Details

Exam Name

ICSE Class 10 Chemistry Examination 2026

Conducting Body

Council for the Indian School Certificate Examinations (CISCE)

Subject

Chemistry

Exam Date

Wednesday, 11 March 2026

Exam Time

11:00 AM

Paper Name

Science Paper 2 (Chemistry)

Exam Duration

3 Hours

Total Marks

100

External Exam Marks

80

Internal Assessment Marks

20

Exam Mode

Offline (Pen and Paper)

Official Website

cisce.org 

Question Number

Questions

Marks

SECTION A

(Attempt all questions from this Section)

1

(i) Match the following Column A with Column B 

Column A
a) Sodium Chloride
b) Methane
c) Hydrogen chloride gas
d) Oxidation reaction
e) Water

Column B

1. has two shared pair of electrons

2. has high melting and boiling points

3. a greenhouse gas

4. has low melting and boiling points

5. Zn − 2e⁻ → Zn²⁺

6. S + 2e⁻ → S²⁻

(ii) Answer the following in one sentence: 

a) What is the number of gram atoms in 4.6 grams of sodium (Na = 23)

b) Draw the structural formula for: Methanal

c) What do you understand by the term: Qualitative analysis

d) Correct the statement: Magnesium reacts with Conc. Nitric acid to liberate hydrogen gas

e) Define: Alloy

(iii) Name the following:
a) The gas released at the anode during the electrolysis of acidified water
b) Valence electrons that in a covalent bond are not shared with another atom
c) The property by which certain hydrated salts, when left exposed to atmosphere, lose their water of crystallization and crumble into powder

Give the IUPAC name for each of the following:
d) (structure shown – propanol)
e) (structure shown – but-2-ene)

(iv) State whether the following statements are True or False: 

a) The formula of sodium zincate is ZnNa₂O₂

b) Anhydrous HCl is a gas and does not contain any ions, hence it is a poor conductor of electricity

c) Ammonium nitrate is a compound of nitrogen which is readily used in the preparation of ammonia

d) Conc. Nitric acid prepared in the laboratory is pink in colour

e) Sulphuric acid is referred to as Oil of vitriol

(v) Complete the following by choosing the correct answers from the bracket: 

a) The _______ of an element is the number of times one atom of the element is heavier than 1/12 times of the mass of an atom of carbon-12.
(Relative atomic mass / Relative molecular mass)

b) When sodium chloride is heated with concentrated Sulphuric acid below 200°C, one of the products formed is _______.
(sodium hydrogen sulphate / sodium sulphate / chlorine)

c) Ammonia reacts with excess chlorine to form _______.
(nitrogen / nitrogen trichloride / ammonium chloride)

d) Substitution reactions are characteristic reactions of _______.
(alkynes / alkenes / alkanes)

e) In Period 3, the most metallic element is _______.
(sodium / magnesium / aluminium)

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2

Choose one correct answer to the questions from the given options: 

(i) The name of W, X, Y and Z compounds is as follows:

W ⇒ HCl

X ⇒ C₂H₅OH

Y ⇒ CH₃COOH

Z ⇒ C₂H₅CHO

Which of the following statements regarding the property is correct?

a) W and X are acids

b) X and Y are acids

c) X and Z are acids

d) W and Y are acids

(ii) A metal present in Cryolite other than sodium _______.

a) Zinc

b) Silver

c) Copper

d) Aluminium

(iii) Which of the following groups is the most reactive?

a) alkali metals

b) halogens

c) metalloids

d) noble gases

(iv) The drying agent used to dry HCl gas is _______.

a) Conc. H₂SO₄

b) ZnO

c) Al₂O₃

d) CaO

(v) A substance has a molecular formula of C₈H₁₀N₄O₂ then its empirical formula is _______.

a) CHNO

b) C₂H₆N₂O

c) C₄H₅N₂O

d) C₉H₇N₃O

(vi) A substance which on heating leaves yellow residue is _______.

a) Ammonium nitrate

b) Lead nitrate

c) Calcium chloride

d) Potassium nitrate

(vii) The equation NaCl + H₂SO₄ → NaHSO₄ + HCl shows _______ property of H₂SO₄.

a) Acidic

b) Non-volatile

c) Neutral

d) Basic

(viii) Aqueous ammonia is a solution of _______ in water.

a) HCl

b) NO₃

c) NH₃

d) NH₄

(ix) As atoms of elements in group 16 are considered in order from top to bottom, the electronegativity of each successive element _______.

a) increases

b) remains the same

c) decreases

d) does not follow any trend

(x) The main components of Bronze are _______.

a) Cu [1%], Zn [80%], Sn [19%]

b) Cu [80%], Zn [1%], Sn [19%]

c) Cu [60-80%], Zn [40-20%]

d) Cu [40-20%], Zn [60-80%]

(xi) The basicity of acetic acid is _______.

a) 1

b) 2

c) 3

d) 4

(xii) We cannot store AgNO₃ solution in copper vessels because _______.

a) copper is a cheap metal it spoils AgNO₃

b) copper lies above silver in electro-chemical series, it displaces Ag from silver nitrate

c) copper lies below silver in electrochemical series, it displaces Ag from silver nitrate

d) This could lead to excessive heating resulting in fire

(xiii) Which of the following statements is wrong about Alkanes?

a) They are all saturated hydrocarbons.

b) They can undergo addition as well as substitution reaction.

c) They are almost non-polar in nature.

d) On complete combustion give out carbon dioxide and water.

(xiv) Which statement correctly describes the 2 electrodes?
G: The anode is negative and the cathode is positive
H: The anode and cathode are both positive
I: The anode is positive and the cathode is negative

a) Both G and H
b) only G
c) only H
d) only I

(xv) A molecule with triple covalent bonds is _______.

a) C₂H₄

b) H₂

c) F₂

d) N₂

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SECTION B

(Attempt any four questions)

3

(i) a) The metals of Group 2 from top to bottom are: Be, Mg, Ca, Sr and Ba.

Which forms ions most readily? Give reason

b) Identify W and X:

W: has two electron shells completely filled

X: has twice as many electrons in second shell as in first shell

(ii) a) Give reasons: Substitution reactions are characteristic reactions of saturated organic compounds only

b) Give balanced equations for conversion of an alkene to an alkane

(iii) What is meant by “acidity of a base”?

Give one example each of a Monacid base and a Triacid base.

(iv) A metal article is to be electroplated with silver. The electrolyte selected is sodium argentocyanide.

a) Why is it preferred to silver nitrate as an electrolyte?

b) State one condition to ensure that the deposit is smooth, firm and long lasting.

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4

(i) Conc. nitric acid prepared in the laboratory is yellow in colour. Why?

Describe one method to remove this colour.

(ii) Silicon (Si = 28) forms a compound with chlorine (Cl = 35.5).

5.6 g of silicon combines with 21.3 g of chlorine.

Calculate the empirical formula. 

(iii) What happens when ammonia solution is added first dropwise and then in excess to CuSO₄?

Write balanced equations.

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5

(ii) Give reasons: Liquid ammonia is advantageous over CFC as a refrigerant in ice plants.

(iii) Aluminium is obtained from alumina. Answer:

a) Electrolyte used

b) Reaction at cathode

(iv) Explain with equations:

a) HCl, HNO₃, C₂H₅OH, C₆H₁₂O₆ all contain hydrogen atoms but only HCl and HNO₃ show acidic character

b) Is PbO₂ a base or not? Comment

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6

(i) A₂B is the empirical formula of a compound which has vapour density 25. If atomic weight of A and B are 10 and 5 respectively, find its molecular formula. 

(ii) Study the diagram which shows the Brown Ring Test and answer:

a) Which ion is determined by Brown Ring Test?

b) Why is freshly prepared iron(II) sulphate used in the test?

c) Name the substance Z

(iii) a) Name the acid used for the preparation of HCl. Why is this acid preferred to other acids?

b) Give the balanced equation for the reaction

c) Phosphorus pentoxide and calcium oxide are good drying agents, but they cannot be used to dry hydrogen chloride gas. Why? 

(iv) How many atoms of each kind are present in the following molecules:

Calcium Oxide and Carbon-tetrachloride? 

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7

(i) a) What property of Conc. H₂SO₄ is used when sugar turns black in its presence?
b) Distinguish between Concentrated and Dilute sulphuric acid (any two points)

(ii) On adding dilute ammonia to a colourless salt solution, a white gelatinous precipitate forms which dissolves in excess ammonia.

a) Identify the metal salt used (Na, Al, Zn, Pb, Fe)

b) Write the formula of the white gelatinous precipitate

(iii) a) What does spurious alcohol contain? What happens if it is consumed?
b) Explain with reactions the preparation of ethanol by hydrolysis of ethene 

(iv)

A) Explain why hydrogen chloride gas is not collected over water
B) Complete the table:

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8

(i) The table below shows information about elements A, B, C and D:

To which groups do A, B, C and D belong?

(ii) Give balanced reactions of each type to show the following properties of sulphuric acid:

a) Acidic nature

b) Non-volatile nature

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ICSE Class 10 Chemistry Pre Board Question Paper 2026 PDF

Subject Name

Percentage Marks - External Exams (%)

Percentage Marks - Internal Exams (%)

Chemistry

80%

20%