CHEMISTRY TARGET

QUESTION PAPER ICSE - 2024

Topic: Test Series #2 10th ICSE AY:-2023-24

Section A (Attempt all questions from this section)

Question 1 (Select the correct answers to the questions from the given options) [15]
a) A salt of ammonia which decomposes explosively when heated is:
i) ammonium nitrite
ii) ammonium nitrate
iii)ammonium carbonate
iv) none of these

b) Identify the product which represents the solid state in the reaction
shown in the adjacent diagram.
i) Barium chloride ii) Barium Sulphate
iii) Sodium Chloride iv) Sodium Sulphate

c) How will you protect yourself from the heat generated while diluting
a concentrated acid?
i) By adding acid to water with constant stirring ii) By adding water to acid with constant stirring.
iii) By adding water to acid followed by base. iv) By adding base to acid with constant stirring.

d) When silver nitrate solution is treated with hydrochloric acid a thick curdy white precipitate of silver
chloride is formed. This white precipitate dissolves in excess of:
i) sodium hydroxide solution ii) ammonium hydroxide solution
iii) potassium hydroxide solution iv) calcium hydroxide solution

e) Which is the correct balanced chemical equation for the preparation of ammonia gas?
i) Mg3N₂(s) + H₂O(l) → 3Mg(OH)₂ (aq) + 2NH3(g) ii) Mg3N₂(s) + 4H₂O(l) → 3Mg(OH)₂(aq) + 2NH3(g)
iii) Mg3N₂(s) + 6H₂O(l) → 3Mg(OH)₂(aq) + 2NH3(g) iv) Mg3N₂(s) + 2H₂O(l) → 3Mg(OH)₂(aq) + 2NH3(g)

f) Ammonia gas turns colourless Nessler's reagent to :

i) pale brown ii) pale green iii) pale yellow iv) pale red

g) A hydrocarbon has condensed formula: CH3 - CH2 - CH2 - C ≡ CH The IUPAC name of hydrocarbon is:
i) pentane ii) pentene iii) pentyne iv) none of these

h) Which one of the following correctly represents Sodium oxide?

i) ii) iii) iv)

i) The graph given below depicts a neutralization reaction (acid + alkali →

salt + water). The pH of a solution changes as we add excess of acid to an
alkali.
Which letter denotes the area of the graph where both acid and salt are
present?
i) A ii) B iii) C iv) D

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CHEMISTRY TARGET
QUESTION PAPER ICSE - 2024

Topic: Test Series #2 10th ICSE AY:-2023-24

j) The gas evolved when dilute sulphuric acid reacts with iron sulphide:
i) Sulphur dioxide ii) Carbon dioxide iii) Hydrogen sulphide iv) Nitrogen dioxide

k) The colour change observed when solution of magnesium hydroxide is tested with the indicators given:
i) phenolphthalein turns colourless to pink ii) methyl orange remains orange
iii) phenolphthalein remains colourless iv) blue litmus solution turns red

l) Which of the following is a common characteristic of a covalent compound?

i) High melting point ii) Conducts electricity when it is in the molten state.
iii) Consists of molecules. iv) Always soluble in water.

m) During the electrolysis of acidified water which of the following takes place:
i) Oxygen is released at cathode. ii) Oxygen is released at anode.
iii) Hydrogen is released at anode. iv) Sulphur dioxide is released at anode.

n) The element with the highest ionization potential in the periodic table is:
i) He ii) Ne iii) Ar iv) Xe

o) Identify the metallic oxide which is amphoteric in nature

i)Calcium oxide ii) Barium Oxide iii) Zinc Oxide iv) Copper (II) oxide

Question 2
a) GIVE ONE WORD OR A PHRASE FOR THE FOLLOWING STATEMENT: [5]
i. The property by which carbon bonds with itself to form a long chain.
ii. A hydrocarbon which contributes towards the greenhouse effect.
iii. The type of reactions alkenes undergo.
iv. The first homologue whose general formula is CnH₂n
v. The compound formed by complete chlorination of ethyne.

b) In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water

(i) Draw a diagram to show the arrangement used for the absorption of HCI in water [1]
(ii) Why is such an arrangement necessary? Give two reasons. [2]
(iii) Write the chemical equations for the lab. preparation of HCI gas when the reactants are: [2]
(1) below 200 ℃ (2) above 200 ℃

c) Complete the following by choosing correct answers from the bracket: [5]
i) A base is a compound that releases ____ [H+/OH-] when dissolved in water.
ii) ____ [Na/Ca] belongs to first group of the periodic table.
iii) _____ [ionic/covalent] bond is formed due to mutual sharing of electrons between two atoms.
iv) During ionisation metals lose electrons, this change is called ____ [oxidation/reduction].
v) Sodium hydrogen Sulphate is an example of_____ [acid salt / mixed salt].

d) Calculate:
i) Compound A has following percentage composition by mass: Carbon 42.10 %, oxygen 51.42% and remaining
is hydrogen. Determine the empirical formula of compound A (work to one decimal place). If vapour density is
30, what is the molecular formula of compound A. [ C=12, H=1, O= 16] [4]

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CHEMISTRY TARGET
QUESTION PAPER ICSE - 2024

Topic: Test Series #2 10th ICSE AY:-2023-24

ii) The molecular formula of a compound is C4H8O2 find its empirical formula. [1]

e) Choose the correct option from foll. list of substances, to what matches the description from (i) to (v)[5]

Iron III sulphate, hydrogen chloride, hydrogen, hydrochloric acid, potassium hydroxide, Iron II sulphate, carbon
tetrachloride, lithium. nitric acid, Iron II hydroxide.

(i) A metal which has smallest atomic size in Group-1.

(ii) A salt which gives a dirty green precipitate when sodium hydroxide solution is added to it.
(iii) The substance manufactured by Ostwald’s Process.
(iv) A substance when added to a solution increases the pH of solution.
(v) A covalent compound which is soluble in organic solvent but insoluble in water.

Section B (Solve any 4 questions)

Question 3
a) Fluorine, Chlorine, Bromine and Iodine are elements belonging to certain group in the Periodic Table.
Answer the following questions in relation to these elements: [5]
(i) Name the Group to which these elements belong.
(ii) How many electrons are present in outermost shell of bromine?
(iii) Which element will have least electro-negativity?
(iv) Which element will have highest electron affinity?
(v) Explain why elements in the group present to the right of this group have larger atomic size?

b) Give 2 points of differences between roasting & calcination. [2]

c) Name the type of particles present in: [3]

(i) Carbonic acid (ii) Sulphuric acid (iii) Sugar solution.

Question 4
a) A solution contains Mg2+ ions, Fe2+ ions & Cu2+ ions. On passing an electric current through this solution
which ions will be first to be discharged at the cathode. Write the equation for the cathode reaction. [2]

b) The number of atoms in one mole is 6 * 1023. Calculate: [N=14, H=1, Cl=35.5, Ca=40, O=16] [3]
i) Total number of molecules in 14gm of nitrogen gas.
ii) Total number of atoms in 18gm of water.
iii) The number of chloride ions in 111gm of anhydrous calcium chloride.

c) Draw electron dot diagram of magnesium chloride & carbon tetrachloride. [3]

d)(i) Sodium hydroxide solution is added to solution A, a white precipitate is formed which is soluble in excess
of sodium hydroxide. What metal ion is present in A? [1]
(ii) Ammonium hydroxide solution is added to solution B, when a pale blue precipitate is formed. This pale blue
precipitate dissolves in excess of ammonium hydroxide to give inky blue colouration. Name the cation present
in B. [1]

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CHEMISTRY TARGET
QUESTION PAPER ICSE - 2024

Topic: Test Series #2 10th ICSE AY:-2023-24

Question 5
a) WRITE BALANCED CHEMICAL EQUATION FOR EACH OF THE FOLLOWING: [4]
(i) Chlorine reacts with excess of ammonia
(ii) Action of cold and dilute nitric acid on copper.
(iii) Ammonia and oxygen in the presence of catalyst.
(iv) Acetic acid is warmed with ethanol in the presence of conc. sulphuric acid.

b) A, B, C & D summarize the properties of sulphuric acid depending on if it is dilute or concentrated. [3]
A=Typical acid property B = Non Volabile acid
C=Oxidizing agent D = Dehydrating agent
Choose the property (A, B, C or D) depending on which is relevant to each of the following:
(i) Preparation of hydrogen chloride gas
(ii) Preparation of copper sulphate from copper oxide
(iii) Action of conc. sulphuric acid on sulphur

c) The diagram shows an experimental set-up for the laboratory preparation of a

pungent smelling gas. The gas is alkaline in nature. [3]
(i) Name the gas collected in the jar.
(ii) Write the balanced equation for the above preparation.
(iii) How is the gas being collected?

Question 6
a) Answer the following questions: [2]
i) Define isomerism
ii) Give the IUPAC name of the isomer C4H10 which has a branched chain.

b) Give the structural formulate for the following: [2]

i) An isomer of n-pentane. ii) 2-propanol.

c) The following is a sketch of an electrolytic cell used in the extraction of aluminium: [3]
(i) What is the substance of which the electrodes A and B are made?
(ii) At which electrode (A or B) is aluminium formed?
(iii) What are the two aluminium compounds in the electrolyte C?

d) Give balanced chemical euqations in each of the following cases. [3]

i) To prepare lead chloride from lead carbonate (give 2 equations)
ii) Iron [III] chloride from the metal iron.

Question 7
a) Distinguish between the following: [2]
(i) Dilute HCl and dilute HNO3 [ using silver nitrate solution]
(ii) Dilute HCl and dilute H2SO4[using lead nitrate solution]

b) Name the alloys for the given composition: [2]

(i) Magnesium and aluminium
(ii) Magnesium + Manganese + Aluminium + Copper

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CHEMISTRY TARGET
QUESTION PAPER ICSE - 2024

Topic: Test Series #2 10th ICSE AY:-2023-24

c) STATE ANY ONE OBSERVATION FOR EACH OF THE FOLLOWING: [3]

(i) Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
(ii) Ammonia gas is burnt in an atmosphere of excess of oxygen.
(iii) Nitric acid is kept in a reagent bottle for a long time.

d) Give reasons [3]

(i) Almost 90% of all known compounds are organic in nature.
(ii) It is dangerous to burn methane in an insufficient supply of air.
(iii) Pure acetic acid is known as glacial acetic acid

Question 8
a) LPG stands for liquefied petroleum gas. Varieties of LPG are marketed including a mixture of propane (60%)
and butane (40%). If 10 litre of this mixture is burnt, then find the total volume of carbon dioxide gas added to
the atmosphere. Combustion reactions can be represented as: [3]
C3H8(g) + 5O₂(g) → 3CO₂ (g) + 4H2O(g) & 2C4H10(g) +13O₂(g) → 8CO₂ (g) + 10H2O(g)

b) Match the Column A with Column B: [5]

Column A Column B
(i) Sodium chloride Increases
(ii) Ammonium ion Covalent bond
(iii) Electronegativity across the period Ionic bond
(iv) Non-metallic character down the group Covalent & coordinate bond
(v) Water Decreases

c) Define the following terms: [2]

i. Ionisation potential ii. Electron affinity

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