ICSE Class 10 Chemistry Sample Question Paper 6 with Answers

ICSE Class 10 Chemistry Sample Question Paper 6 with Answers

Maximum Marks: 40
Time: 1 1/2 Hours

Section-A [10 Marks]
(Attempt all questions from this Section)

Question 1.
Choose the correct answers to the questions from the given options. (Do not copy the question, write the correct answer only.)
(i) The product obtain at the end of the reaction, as shown in the following figure is:

(a) Sulphuric acid
(b) Nitric acid
(c) Hydrochloric acid
(d) Hydrogen chloride gas
Answer:
(c) Hydrochloric acid
Explanation:
This arrangement shown the production of HCl gas using sodium chloride and sulphuric acid. The gas so produced is then purified using cone. H₂SO₄ and then pass through an empty beaker. At last, passes through water which produces hydrochloric acid. Hence the end product is HCl acid.

(ii) The reaction taking place in the Haber’s process is ________ reaction.
(a) Endothermic and irreversible
(b) Endothermic and reversible
(c) Exothermic and reversible
(d) Exothermic and irreversible
Answer:
(c) Exothermic and reversible
Explanation:
The reaction of nitrogen and hydrogen gas to produce ammonia is highly exothermic as it produces an enormous amount of heat. Also, it is reversible in nature. The reason is that some of produce, ammonia, converts back to the original reactants, nitrogen and hydrogen, under the reaction conditions. Since the reverse reaction occurs under the same conditions as the forward reaction, the reaction is reversible.

(iii) Reaction of copper with dil. and cone, nitric acid yields ________ and ________ gases respectively.
(a) NO and NO₂
(b) NO₂ and NO₃
(c) NO and NO₃
(d) NO and N₂
Answer:
(a) NO and NO₂
Explanation:
3Cu + 8HNO₃(dil.) → 3 Cu(NO₃)₂ + 4H₂O + 2NO
Cu + HNO₃(conc.) → Cu(NO₃)₂ + NO₂ + H₂O
Both dilute and concentrated nitric acid reacts with copper to give salt of copper nitrate and water. However, both of these acids produce different gases. Dilute nitric acid produces nitrous oxide, whereas concentrated nitric acid produces nitrogen dioxide.

(iv) Pyrosulphuric acid is the chemical name of:
(a) Green vitriol
(b) White vitriol
(c) Oleum
(d) Gypsum
Answer:
(c) Oleum
Explanation:
Oleum is a common name of a compound having molecular formula H₂S₂O₇. This compound is also known as pyrosulphuric acid. It is produced during the manufacturing of sulphuric acid in the contact process.

(v) An unsaturated hydrocarbon having a triple covalent bond has 50 hydrogen atoms in its molecule. The number of “C” atoms in its molecule will be:
(a) 24
(b) 25
(c) 28
(d) 26
Answer:
(d) 26
Explanation:
The compounds containing triple bond are known as alkynes and they have the general formula of C_nH_2n-2. Where, n is the number of atoms in one molecule. If the number of hydrogen atoms in its molecule is 50, then the number of carbon atoms should be 26 (2n – 2 = 50) therefore n = 26.

(vi) In electrolytic reduction of alumina the reaction of oxidation of anode by oxygen produces:
(a) N₂ gas
(b) H₂ gas
(c) CO₂ gas
(d) O₂gas
Answer:
(c) CO₂ gas
Explanation:
In electrolytic reduction of alumina, oxygen is produced at anode. This oxygen oxidizes anode (which is made up of graphite) to initially give carbon monoxide, which when further combines with oxygen produces carbon dioxide gas.

(vii) The addition of water inside the flask containing HCl gas in fountain experiment the ________ inside the flask.
(a) Lowers; pressure
(b) Increases; pressure
(c) Lowers; number of moles
(d) Increases; temperature
Answer:
(a) Lowers; pressure
Explanation:
The HCl gas present inside the flask, when mixed with water, lowers the pressure inside the flask as some gas molecules dissolve in water.

(viii) In the contact process, platinum is replaced by the catalyst V₂O₅ because:
(a) Platinum has highly reactive in nature
(b) Platinum is costly and can be easily poisoned
(c) Platinum is cheap
(d) Platinum does not act as a catalyst
Answer:
(b) Platinum is costly and can be easily poisoned
Explanation:
Platinum is an efficient catalyst, but it is costly and easily poisoned by arsenic oxide. V₂O₅ is an efficient catalyst and less expensive than platinum and hence is a suitable replacement for platinum.

(ix)

Column-I	Column-II
(1) Functional group present in alcohol.	(i) Addition reaction.
(2) Characteristic reaction of saturated hydrocarbon.	(ii) Preservation of fish.
(3) Characteristic reaction of unsaturated hydrocarbon.	(iii) Substitution reaction.
(4) Use of vinegar.	(iv) -OH

Which option is correct?
(a) (1)-(iv), (2)-(iii), (3)-(i), (4)-(ii)
(c) (1)-(iii), (2)-(iv), (3)-(ii), (4)-(i)
(b) (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i)
(d) None of these
Answer:
(a) (1)-(iv), (2)-(iii), (3)-(i), (4)-(ii)

(x) Complete the reaction by giving all the products formed:
(a) CO₂ + H₂O
(b) CO₂ + N₂ + H₂O
(c) NO₂ + CO₂ + H₂O
(d) N₂O + CO + H₂
Answer:
(c) NO₂ + CO₂ + H₂O
Explanation:
Carbon reacts with concentrated nitric acid to give carbon dioxide, water and nitrogen dioxide gas. Due to the strong oxidising nature of nitric acid, it oxidises carbon to CO₂. The reaction is given as
C + 4HNO₃ → CO₂ + 2H₂O + 4NO₂

Section-B [30 Marks]
(Attempt any three questions from this Section)

Question 2.
(i) Define:
(a) Mineral
(b) Isomers
(ii) Name the compound formed when:
(a) The property to form long chains of atoms through chemical linkage among the atoms.
(b) A fertilizer made by combining ammonia and carbon dioxide.
(iii) Draw the structural diagram of:
(a) 2, 3-Dimethyl butane
(b) 2-Propanol
(c) 1-Propanal
(iv) Complete and balance the following chemical equations:
(a) C₂H₄ + H₂ →
(b) S + HNO₃\(\stackrel{\Delta}{\longrightarrow}\)
(c) C₁₂H₂₂O₁₁ + H₂SO₄ →
Answer:
(i) (a) The naturally occurring compounds of elements are known as mineral. It has a definite chemical composition and ordered atomic structure.
(b) Compounds having the same molecular formula, but different structural formula, are called ‘isomers’ of one another and this phenomenon is called ‘isomerism’.

(ii) (a) Catenation
(b) Urea (NH₂CONH₂)

Question 3.
(i) Identify the anion present in the following compounds :
(a) Compound X on heating, with copper turnings and concentrated sulphuric acid liberates a reddish brown gas.
(b) Compound L on reacting with barium chloride solution gives a white precipitate insoluble in dilute hydrochloric acid or dilute nitric acid.
(ii) Identify the gas evolved in each of the following cases :
(a) A colourless gas liberated on decomposition of nitric acid
(b) The gas released when sodium carbonate is added to a solution of sulphur dioxide.
(iii) State the observation for the following, when:
(a) Ethanol is heated with cone. H₂SO₄ at 170°C.
(b) Silver nitrate solution is added to dilute hydrochloric acid.
(c) Zinc sulphide is heated with dilute hydrochloric acid.
(iv) Write balanced equation for the following conversions:
(a) Ethane to ethyl chloride.
(b) Ferric hydroxide from ferric chloride.
(c) Ammonium nitrate from ammonia.
Answer:
(i) (a) Nitrate ion, NO₃^–
(because reddish brown fumes are evolved with turns KI paper brown. This shows the presence of NO₃^– ion.)

(b) Sulphate ion, SO₄^2-
(BaCl₂ + SO₄^2- → BaSO₄ + 2 Cl^–)

(ii) (a) Nitrogen dioxide (4HNO₃ → 2H₂o + 4NO₂ + o₂)
(b) Carbon dioxide gas (Na₂Co₃ + 2So₂ + H₂O → 2NaHSO₃ + CO₂)

(iii) (a) When ethanol is heated with cone. H₂SO₄ at 170°C, it undergoes dehydration and forms ethene.

(b) When silver nitrate solution is added to dilute hydrochloric acid, an insoluble white precipitate of silver chloride is formed.

(c) When zinc sulphide is heated with dilute hydrochloric acid, a colourless hydrogen sulphide gas is evolved, which has a rotten egg smell.

(iv) (a) When equal volumes of ethane and chlorine are exposed to diffused sunlight, they react to form ethyl chloride (monochloroethane).

(b) When an aqueous solution of ammonia is added to ferric chloride solution, a reddish brown precipitate of ferric hydroxide is produced which is insoluble even in the excess of ammonium hydroxide.

(c) Ammonia reacts with nitric acid to from ammonium nitrate.

Question 4.
(i) State the relevant reason for the following:
(a) Hydrocarbons are excellent fuels. Give reason.
(b) The mixture of nitrogen and hydrogen gases entering the catalyst chamber must be pure. Why?
(ii) Name the metals which can be extracted from the following ores:
(a) Bauxite
(b) Haematite
(iii) Identify the terms for the following:
(a) An alloy used in the manufacturing of pressure cookers.
(b) An explosive formed when ammonia and chlorine react together.
(c) The first member of alkyne series.
(iv) The following questions are based on the preparation of ammonia gas in the laboratory:
(a) Name the compound normally used as a drying agent during the process.
(b) How is ammonia gas collected?
(c) Explain why it is not collected over water.
Answer:
(i) (a) Hydrocarbons are excellent fuels because they ignite easily at low temperature and liberate large amount of heat without producing harmful products.

(b) The mixture of nitrogen and hydrogen gases entering the catalyst chamber must be pure, because the presence of carbon dioxide, carbon monoxide and traces of sulphur compound poisoned the catalyst. Therefore, the removal of these catalyst poison from nitrogen and hydrogen is very essential.

(ii) (a) Aluminium
(b) Iron

(iii) (a) Duralumin (alloy of 95% Al as steel, 4% Cu„ 0.5% Mn and 0.5% Mg)
(b) Nitrogen trichloride (NH₃ + 3Cl₂ → 3HCl + NCl₃)
(c) Acetylene (Ethyne) C₂H₂.

(iv) (a) Quick lime. (CaO is a hydroscopic salt as it readily absorbs moisture)
(b) By downward displacement of air.
(c) It is highly soluble in water.

Question 5.
(i) Write the names and molecular formulas of following:
(a) Third member of homologous series of alkynes.
(b) Member of homologous series of alkenes having the molecular weight of 56
(ii) Select the correct answer from the brackets to complete the following statements:
(a) Ammonia gas is dried by using ________ during its laboratory preparation.
(b) Sodium carbonate on treatment with hydrochloric acid gives sodium chloride and ________ gas. (oxygen/carbon dioxide/carbon monoxide)
(iii) Give the IUPAC names of the following organic compound:

(iv) Write balanced chemical equation to show preparation of sulphuric acid using :
(a) SO₃
(b) cone. HNO₃
(c) Cl₂
Answer:
(i) (a) Butyne (Methyne is not possible, thus, first member is Ethyne, second member is Propyne and third member is Butyne. C₄H₆

(b) Butene, C₄H₈ (Molecular weight of C₄H₈ = 12 x 4 + 1 x 8)
= 48 + 8
= 56u

(ii) (a) Quick lime
(b) Carbon dioxide (Na₂Co₃ + 2HCl → 2NaCl + CO₂ + H₂O)

(iii) (a) But-l-ene
(b) 2, 2, 3, 3-Tetramethyl butan-l-ol
(c) But-2-yne

(iv) (a) SO₃ + H₂O → H₂SO₄
(b) IMGGG
(c) SO₂ + 2H₂O + Cl₂ → H₂SO₄ + 2HCl

Question 6.
(i) Distinguish between the following:
(a) Ethene and ethane [using potassium permanganate solution]
(b) Dilute HCl and dilute H₂SO₄ [using lead nitrate solution]
(ii) Give one word for the following statements:
(a) The shape of methane molecule.
(b) The most common ore of aluminium.
(iii) A, B, C and D summarize the properties of sulphuric add depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (a) to (c):
(A) Dilute acid (typical acid properties)
(B) Non-volatile acid.
(C) Oxidizing agent.
(D) Dehydrating agent
(a) Preparation of hydrogen chloride.
(b) Preparation of ethene from ethanol.
(c) Preparation of copper sulphate from copper oxide.
(iv) (a) Write a balanced equation for the complete combustion of ethane.
(b) Name a solid which can be used instead of concentrated sulphuric acid to prepare ethylene by the dehydration of ethanol.
(c) Ethylene forms an addition product with chlorine. Name this addition product and write its structural formula.
Answer:
(i) (a) When few drops of purple colour potassium permanganate is added to ethane, its purple colour does not fades but when a few drops of it is added to ethene, the solution decolourizes.

(b) Lead nitrate reacts with dilute HCl to form the insoluble salt lead chloride, which appears as the white precipitate. The insoluble lead chloride reacts with excess Cl- ions (of HCl) to form a soluble complex, the tetrachloroplumbate(II) ion,
Pb(NO₃)₂ + 2HCl → PbCl₂↓+ 2HNO₃
PbCl₂ + 2HCl → [PbCl₂]^-2 + 2H⁺ (aq)
Soluble
Lead nitrate solution reacts with H₂SO₄ to give lead sulphate, which does not dissolve further in sulphuric solution.
Pb(NO₃)₂ + H₂SO₄ → PbSO₄ ↓ + 2HNO₃

(ii) (a) Tetrahedral
Bauxite

(iii)(a) B (non-volatile acid).

ICSE Class 10 Chemistry Question Papers with Answers