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# Chemistry Set 1 2018-2019 ICSE Class 10 Question Paper Solution

Course
Chemistry [Set 1]
Date: March 2019

1) Attempt all questions from section 1
2) Attempt any four questions from section 2

SECTION - I (40 Marks)
[40]1
[5]1.a
[1]1.a.i

Choose the correct answer from the options given below :
An electrolyte which completely dissociates into ions are :

Alcohol

Carbonic acid

Sucrose

Sodium hydroxide

Concept: Ions Present in Mineral Acids, Alkalis and Salts and Their Solutions
Chapter: [0.03] Study of Acids, Bases and Salts
[1]1.a.ii

Choose the correct answer from the options given below :
The most electronegative element from the following elements is :

Magnesium

Chlorine

Aluminium

Sulphur

Concept: Periodicity on the Basis of Atomic Number for Elements
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]1.a.iii

Choose the correct answer from the options given below :
The reason for using Aluminium in the alloy duralium is :

Aliminium is brittle

Aliminium gives strength

Aluminium brings lightness

Aluminium lowers melting point

Concept: Metals and Their Alloys - Extraction of Aluminium
Chapter: [0.07] Metallurgy
[1]1.a.iv

Choose the correct answer from the options given below :
The drying agent used to dry HCl gas is :

Conc. H2SO

ZnO

Al2O

CaO

Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
Chapter: [0.083] Hydrogen Chloride
[1]1.a.v

Choose the correct answer from the options given below :
A hydrocarbon which is a greenhouse gas is

Acetylene

Ethylene

Ethane

Methane

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [0.09] Organic Chemistry
[5]1.b
[1]1.b.i

Fill in the blanks with the choices given in brackets :
Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of_________ (dehydration / dehydrogenation / dehydrohalogenation

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [0.09] Organic Chemistry
[1]1.b.ii

When sodium chloride is heated with concentrated sulphuric acid below 200°C, one of the products formed is ________ .

sodium hydrogen sulphate

sodium sulphate

Chlorine

Concept: Hydrogen Chloride - Reaction with Ammonia
Chapter: [0.083] Hydrogen Chloride
[1]1.b.iii

Fill in the blank From the correct choices give below :
Ammonia reacts with excess chlorine to form __________

nitrogen

nitrogen trichloride

ammonium chloride

Concept: Ammonia - Uses of Ammonia
Chapter: [0.081] Ammonia
[1]1.b.iv

Fill in the blanks with the choices given in brackets :
Substitution reactions are characteristic reactions of ____________ (alkynes / alkenes / alkanes)

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [0.09] Organic Chemistry
[1]1.b.v

Fill in the blanks with the choices given in brackets :
In Period 3, the most metallic element is ___________ (sodium / magnesium / aluminium)

Concept: Periodic Properties - Metallic Character
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[5]1.c
[1]1.c.i

Write a balanced chemical equation for each of the following reactions :
(i) Reduction of copper (II) oxide by hydrogen

Concept: Reduction of Metallic Oxides
Chapter: [0.07] Metallurgy
[1]1.c.ii

Write a balanced chemical equation for each of the following reactions :
Action of dilute sulphuric acid on sodium hydroxide.

Concept: Concept of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid
[1]1.c.iii

Write a balanced chemical equation for each of the following reactions :
Action of dilute sulphuric acid on zinc sulphide.

Concept: Concept of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid
[1]1.c.iv

Write a balanced chemical equation for each of the following reactions :
Ammonium hydroxide is added to ferrous sulphate solution.

Concept: Concept of Ammonia
Chapter: [0.081] Ammonia
[1]1.c.v

Write a balanced chemical equation for each of the following reactions :
Chlorine gas is treated with ethane.

Concept: Organic Chemistry - Hydrocarbons - Alkenes,
Chapter: [0.09] Organic Chemistry
[5]1.d
[1]1.d.i

State one observation for each of the following:
(i) Concentrated nitric acid is reacted with sulphur.
(ii) Lead nitrate is heated strongly in a test tube.

Concept: Concept of Nitric Acid
Chapter: [0.08199999999999999] Nitric Acid
[1]1.d.ii

Ammonia gas is passed over heated copper (I) oxide.

Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia
[1]1.d.iii

State one observation for each of the following  :
Copper sulphate solution is electrolysed using copper electrodes.

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [0.07] Metallurgy
[1]1.d.iv

State one observation for each of the following  :
A small piece of zinc is added to dilute hydrochloric acid

Concept: Concept of Acids and Bases
Chapter: [0.03] Study of Acids, Bases and Salts
[1]1.d.v

State one observation for each of the following  :
Lead nitric is heated strongly in a test tube.

Concept: General Properties of Salts:
Chapter: [0.03] Study of Acids, Bases and Salts
[5]1.e
[5]1.e.i

Calculate :
The number of moles in 12g of oxygen gas. [O = 16]

Concept: Refer to the Atomicity of Hydrogen, Oxygen, Nitrogen and Chlorine
Chapter: [0.05] Mole Concept and Stoichiometry

Calculate :

The weight of 1022 atoms of carbon   [C = 12, Avogadro’s No. = 6xx10^23 ]

Chapter: [0.05] Mole Concept and Stoichiometry
[5]1.f
[1]1.f.i

Give the IUPAC name of the following organic compounds :

Concept: Organic Chemistry - Simple Nomenclature
Chapter: [0.09] Organic Chemistry
[1]1.f.ii

What is the special feature of the structure of ethyne?

Concept: Organic Chemistry - Hydrocarbons - Alkynes
Chapter: [0.09] Organic Chemistry
[1]1.f.iii

Name the saturated hydrocarbon containing two carbon atoms.

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [0.09] Organic Chemistry
[1]1.f.iv

Give the structural formula of Acetic acid.

Concept: Carboxylic Acids - Concept of Acetic Acid
Chapter: [0.09] Organic Chemistry
[5]1.g
[1]1.g.i

Give the appropriate term defined by the statements given below :
The formula that represents the simplest ratio of the various elements present in one molecule of the compound.

Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
Chapter: [0.05] Mole Concept and Stoichiometry

The tendency of an atom to attract electrons itself when combined in a covalent compound.

Concept: Periodic Properties - Electronegativity
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]1.g.ii

Give the appropriate term defined by the statements given below :
The substance that releases hydronium ion as the only positive ion when dissolved in water.

Concept: Concept of Acids and Bases
Chapter: [0.03] Study of Acids, Bases and Salts
[1]1.g.iii

The tendency of an atom to attract electrons itself when combined in a covalent compound.

Concept: Periodic Properties - Electronegativity
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]1.g.iv

The covalent bond in which the electrons are shared equally between the combining atoms.

Concept: Concept of Covalent Bond
Chapter: [0.02] Chemical Bonding
[1]1.g.v

The covalent bond in which the electrons are shared equally between the combining atoms.

Concept: Concept of Covalent Bond
Chapter: [0.02] Chemical Bonding
[5]1.h
[1]1.h.i

K, Pb, Ca, Zn (In the increasing order of the reactivity)

Concept: Periodic Properties-chemical Reactivity
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]1.h.ii

Mg2+, Cu2+, Na1+, H1(In the order of preferential discharge at the cathode)

Concept: Periodic Properties - Metallic Character
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]1.h.iii

Li, K, Na, H (In the decreasing order of their ionization potential)

Concept: Periodic Properties - Ionisation Potential
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]1.h.iv

F, B, N, O  (In the increasing order of electron affinity)

Concept: Periodic Properties - Electron Affinity
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]1.h.v

Ethane, methane, ethene, ethyne. (In the increasing order of the molecular weight)

Concept: Concept of Organic Compounds
Chapter: [0.09] Organic Chemistry
SECTION - II (40 Marks) Attempt any four questions from this Section
[10]2
[3]2.a
[1]2.a.i

Draw the electron dot structure of :
Nitrogen molecule [N = 7]

Concept: Structure of Electrovalent Compounds NaCl, MgCl2, CaO
Chapter: [0.02] Chemical Bonding
[1]2.a.ii

Draw the electron dot structure of :
Sodium chloride [Na = 11, Cl = 17]

Concept: Structure of Electrovalent Compounds NaCl, MgCl2, CaO
Chapter: [0.02] Chemical Bonding
[1]2.a.iii

Ammonium ion [N = 7, H = 1]

Concept: Structure of Electrovalent Compounds NaCl, MgCl2, CaO
Chapter: [0.02] Chemical Bonding
[3]2.b
[1]2.b.i

The pH values of three solutions A, B and C are given in the table. Answer the folloiwng questions:

 Solution pH value A 12 B 2 C 7

Which solution will have no effect on litmus solution?

Concept: General Properties of Salts:
Chapter: [0.03] Study of Acids, Bases and Salts
[1]2.b.ii

The pH values of three solutions A, B and C are given in the table. Answer the folloiwng questions:

 Solution pH value A 12 B 2 C 7

Which solution will liberate CO2 when reacted with sodium carbonate?

Concept: General Properties of Salts:
Chapter: [0.03] Study of Acids, Bases and Salts
[1]2.b.iii

The pH values of three solutions A, B and C are given in the table. Answer the folloiwng

 Solution pH value A 12 B 2 C 7

Which solution will  turn red litmus solution blue?

Concept: Use of Litmus and pH Paper to Test for Acidity and Alkalinity
Chapter: [0.03] Study of Acids, Bases and Salts
[4]2.c
[1]2.c.i

Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element.

Which element forms electrovalent compound with G?

Concept: Periodic Properties - Electronegativity
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]2.c.ii

Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element.

The ion of which element will migrate towards the cathode during electrolysis?

Concept: Periodic Properties-chemical Reactivity
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]2.c.iii

Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element.

Which non-metallic element has the valency of 2?

Concept: Periodic Properties - Metallic Character
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[1]2.c.iv

Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element.

Which is an inert gas?

Concept: Periodic Properties and Variations of Properties:- Physical and Chemical
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[10]3
[3]3.a
[1]3.a.i

Name the particles present in :
Strong electrolyte

Concept: General Properties of Salts:
Chapter: [0.03] Study of Acids, Bases and Salts
[1]3.a.ii

Name the particles present in :
Weak electrolyte

Concept: Concept of Acids and Bases
Chapter: [0.03] Study of Acids, Bases and Salts
[3]3.b
[1]3.b.i

Distinguish between the following pairs of compounds using the reagent given in the bracket.
Mangenese dioxide and copper (II) oxide. (using concentrated HCl)

Concept: Concept of Hydrogen Chloride
Chapter: [0.083] Hydrogen Chloride
[1]3.b.ii

Distinguish between the following pairs of compounds using the reagent given in the bracket.
Ferrous sulphate solution and ferric sulphate solution. (Using sodium hydroxide solution)

Concept: Concept of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid
[1]3.b.iii

Distinguish between the following pairs of compounds using the reagent given in the bracket.
Dilute hydrochloric acid and dilute sulphuric acid. (Using lead nitrate solution)

Concept: Concept of Nitric Acid
Chapter: [0.08199999999999999] Nitric Acid
[4]3.c

Choose the method of preparation of the following salts, from the methods given in the list:
[List :  A. Neutralization B. Precipitation  C. Direct combination D. Substitution ]
(ii) Iron (II) sulphate
(iii) Sodium nitrate

(iv) Iron (III) chloride

Concept: Preparation - Laboratory Preparation of Salts (Normal and Acid Salts) – Relevant Laboratory
Chapter: [0.03] Study of Acids, Bases and Salts
[10]4
[3]4.a
[1]4.a.i

Complete the following equations :
S + conc.HNO→

Concept: Concept of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid
[1]4.a.ii

Complete the following equations :
C + cons. H2SO4

Concept: Concept of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid
[1]4.a.iii

Complete the following equations :
S + conc.HNO→

Concept: Concept of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid
[3]4.b
[1]4.b.i

Write a balanced chemical equation for the preparation of :
Ethene from bromoethane

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [0.09] Organic Chemistry
[1]4.b.ii

Write a balanced chemical equation for the preparation of :
Ethyne using calcium carbide

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [0.09] Organic Chemistry
[1]4.b.iii

Write a balanced chemical equation for the preparation of :
Methane from sodium acetate

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [0.09] Organic Chemistry
[10]5
[3]5.a
[1]5.a.i

Give the chemical formula of :
Bauxite

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [0.07] Metallurgy
[1]5.a.ii

Give the chemical formula of :
Cryolite

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [0.07] Metallurgy
[1]5.a.iii

Give the chemical formula of :
Sodium aluminate

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [0.07] Metallurgy
[3]5.b
[1]5.b.i

Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [0.07] Metallurgy
[1]5.b.ii

Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [0.07] Metallurgy
[1]5.b.iii

Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [0.07] Metallurgy
[4]5.c
[1]5.c.i

Match the alloys given in column I to the uses given in column II :

 Column I Column II (i) Duralumin A. Electrical fuse (ii) Solder B. Surgical instruments (iii) Brass C. Aircraft body (iv) Stainless Steel D. Decorative articles

Concept: Position of the Metals (Alkali Metals and Alkaline Earth Metals) in the Periodic Table
Chapter: [0.07] Metallurgy
[10]6
[3]6.a
[1]6.a.i

Identify the substance underlined:
The catalyst used to oxide ammonia.

Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia
[1]6.a.ii

Identify the substance underlined:
The organic compound which when solidified, forms an ice like mass.

Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia
[1]6.a.iii

Identify the substance underlined:
The dilute acid which is an oxidizing agent.

Concept: Nitric Acid as an Oxidizing Agent.
Chapter: [0.08199999999999999] Nitric Acid
[1]6.b

Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation :
2NaOH + CuSO4 → Na2SO4 + Cu (OH)2
(i) What mass of copper hydroxide is precipitated by using 200 gm of sodium hydroxide?
[H = 1, O = 16, Na = 23, S = 32, Cu = 64]

(ii) What is the colour of the precipitate formed?

Concept: Molar Volume of a Gas at S.T.P
Chapter: [0.05] Mole Concept and Stoichiometry
[3]6.c

Find the empirical formula and the molecular formula of an organic compound from the data given below :
C = 75.92%, H = 6.32% and N = 17.76%
The vapour density of the compound is 39.5.
[C = 12, H = 1, N = 14]

Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
Chapter: [0.05] Mole Concept and Stoichiometry
[10]7
[3]7.a
[1]7.a.i

Name the gas evolved in each of the following cases :
Alumina undergoes electrolytic reduction.

Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia
[1]7.a.ii

Name the gas evolved in each of the following cases :
Ethene undergoes hydrogenation reaction.

Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia
[1]7.a.iii

Name the gas evolved in each of the following cases :
Ammonia reacts with heated copper oxide.

Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia
[3]7.b

Study the flow chart given and give balanced equations to represents the reactions A, B and C:
$\ce{Mg3N2 ->[A]NH3⇌[B][C]NH4Cl}$

Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia
[4]7.c

Copy and complete the following table which refers to the industrial method for the preparation of ammonia and sulphuric acid:

 Name of the compoun Name of the process Catalytic equation(with the catalyst) Ammonia (i)__________ (ii) __________ Sulhuric acid (iii) ___________ (iv) __________
Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] Ammonia

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