Class 10 ICSE Term2 Chemistry Specimen 2022

Section-A [Chemistry Specimen Paper Semester-2 2022]

Question 1

Choose the correct answers to the questions from the given options

(i) The IUPAC name of Ethylene is:

(a) Propane
(b) Propyne
(c) Ethene
(d) Ethyne

Solution

(ii) Carbon to carbon double bond is found in:

(a) 2-butylene
(b) Acetaldehyde
(c) Acetic acid
(d) Ethyl alcohol

Solution

(iii) Fused alumina is reduced to aluminium by electrolytic reduction, since:

(a) Alumina is highly stable
(b) Alumina is least stable
(c) Alumina is not reduced by drying agents.
(d) Alumina is not reduced by reducing agents.

Solution

(iv) The catalyst preferred in the conversion of Sulphur dioxide to Sulphur trioxide is:

(a) Finely divided iron
(b) Graphite
(c) Vanadium pentoxide
(d) platinum

Solution

(v) Substitution reaction is a characteristic property of:

(a) Alcohols
(b) Alkanes
(c) Alkenes
(d) Alkynes

Solution

(vi) The gas evolved when dilute sulphuric acid reacts with iron sulphide:

(a) Sulphur dioxide
(b) Carbon dioxide
(c) Hydrogen sulphide
(d) Nitrogen dioxide

Solution

(vii) An acid obtained from concentrated nitric acid on reaction with Sulphur:

(a) Carbonic acid
(b) Sulphuric acid
(c) Nitric acid
(d) Hydrochloric acid

Solution

(viii) The hydroxide soluble in excess of ammonium hydroxide is:

(a) Zinc hydroxide
(b) Lead hydroxide
(c) Magnesium hydroxide
(d) Ferrous hydroxide

Solution

(ix) The chemical name of the principal ore of aluminium:

(a) Sodium aluminium fluoride
(b) Aluminium oxide
(c) Hydrated Aluminium fluoride
(d) Hydrated aluminium oxides

Solution

(x) A hydrocarbon which is a greenhouse gas.

(a) Acetylene
(b) Ethylene
(c) Ethane
(d) Methane

Solution

Section-B
(Attempt any three questions from this Section.)

Question 2

(i) Define:

(a) Catenation
(b) Alloy

Solution

(ii) Name the compound formed when:

(a) Ethene reacts with hydrogen in the presence of a catalyst.
(b) Bauxite reacts with sodium hydroxide

Solution

(a) Ethane is produced

(b)

(iii) Draw the structural diagram of:

(a) Propanal
(b) Ethanoic acid
(c) 1,2 dichloroethane

Solution

(a) H₃C-CH₂-CH₂-OH
(b)

(c) Cl-CH₂-CH₂-Cl

(iv) Complete and balance the following chemical equations:

(a) C₂H₆ + O₂ →
(b)C₂H₂ + I₂ →
(c) NH₃ + HCl →

Solution

(a)

(b)

(c)

Question 3

(i) Identify the anion present in the following compounds.

(a) Compound Z which on reacting with dilute sulphuric acid liberates a gas which has no effect on acidified potassium dichromate but turns lime water milky.
(b) The solution of Compound L on reacting with freshly prepared ferrous sulphate solution followed by addition of few drops of concentrated sulphuric acid to the reactants along the sides of a test tube forms a brown ring at the junction of the two liquids.

Solution

(ii) State the following:

(a) The drying agent used in the laboratory preparation of HCl gas.
(b) Products formed when ammonia is burnt in excess of oxygen.

Solution

(a)

(iii) State the observation for the following, when:
(a) Manganese dioxide reacts with concentrated HCl.
(b) A glass rod dipped in concentrated HCl acid is brought near ammonia gas.
(c) Concentrated sulphuric acid is added to carbon.

Solution

(a)

(c)

(iv) Write balanced equation for the following conversions:

(a) Lead sulphate from lead nitrate and sulphuric acid.
(b) Nitrogen tri chloride from ammonia.
(c) Sodium chloride from sodium sulphite and dilute hydrochloric acid.

Solution

Question 4

(i) State the relevant reason for the following:

(a) A layer of powered coke is used over the electrolytic mixture in Hall Heroult’s process.
(b) Graphite anodes are continuously replaced during the electrolysis of alumina.

Solution

(a) It protects the layer of carbon electrodes

(ii) Name the alloys for the given composition:

(a) Magnesium and aluminium
(b) Magnesium + Manganese + Aluminium + Copper

Solution

(a) duralumin and magnox

(b) duralumin is an alloy of aluminium in which a homogeneous mix of Al, Cu , Mg and mangnese

(iii) Identify the terms for the following:

(a) The experiment which demonstrates high solubility of ammonia gas.
(b) A method used to collect HCl gas.
(c) The electrode where reduction takes place.

Solution

(a) Ammonia fountain experiment

(b) Upward delivery or displacement

(c) Cathode

(iv) Complete the table given below:

Solution

(a) Fixation of atmospheric nitrogen

(b) nitric acid

(c) Contact Process

Question 5

(i) Write the balanced chemical equation to show the concentration of ore in Baeyer’s process.

(a) Sodium aluminate to aluminium hydroxide
(b) Aluminium hydroxide to alumina

Solution

(a)

(b)

(ii) Select the correct answer from the brackets to complete the following statements:

(a) The catalyst used in the oxidation of ammonia is __________ [zinc / platinum].
(b) The product formed when ammonia reacts with oxygen is _________ [nitric oxide / nitrous oxide]

Solution

(a) Platinum

(b) 4NH₃(aq) +3O₂ → 2N₂+6H₂O

(iii) Name the following organic compound:

(a) The compound with 3 carbon atoms whose functional group is a carboxylic acid.
(b) The first homologue whose general formula is C_nH_2n.
(c) The compound formed by complete chlorination of ethyne.

Solution

(a) Propanoic acid

(b)

(c)

(iv) Answer the following questions related to the laboratory preparation of the hydrogen chloride gas:

(a) Why is sodium chloride preferred to other metallic chlorides?
(b) State the temperature required in the preparation.
(c) Write the chemical equation

Solution

(b)

(c)

Question 6

(i) Distinguish between the following:

(a) Dilute HCl and dilute HNO₃[ using silver nitrate solution]
(b) Dilute HCl and dilute H₂SO₄[using lead nitrate solution]

Solution

(a)

(ii) Give one word for the following statements:

(a) Naturally occurring minerals from which metals are extracted.
(b) Organic compounds having the same molecular formula but different Structural formula.

Solution

(a) Ores

(b)Isomers

(iii) A, B and C are the chemical properties of sulphuric acid:

A. Oxidizing agent
B. Dehydrating agent
C. Non volatile acid


Match the following equations 1 to 3 to the above chemical properties of sulphuric acid.
1. KNO₃ + H₂SO₄ → KHSO₄ + HNO₃
2. C₁₂H₂₂O₁₁ → 12C + 11H₂O
3. S + 2H₂SO₄ → 2H₂O + 3SO₂

Solution

(iv) Study and complete the following table:

Solution