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# Question Paper Solutions - Chemistry 2016 - 2017 ICSE Class 10

SubjectChemistry
Year2016 - 2017 (March)

Question 1 is compulsory

Attempt any four questions from Question 2  to Question 7

Marks: 80
[40]1
[5]1.1 | Fill in the blanks from the choices given in brackets:

The energy required to remove an electron from a neutral isolated gaseous atom and convert it into a positively charged gaseous ion is called ____________. (electron affinity, ionization potential,
electronegativity)

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

The compound that does not have a lone pair of electrons is __________. (water, ammonia, carbon tetrachloride)

Chapter: [2] Chemical Bonding
Concept: Characteristic Properties of Electrovalent Compounds

When a metallic oxide is dissolved in water, the solution formed has a high concentration of ____________ ions (H+, h3O+, OH-)

Chapter: [4] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide
Concept: Certain Metals and Their Oxides

Potassium sulfite on reacting with hydrochloric acid releases _______ gas. (Cl2, SO2, H2S)

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Acidic Properties of Its Solution

The compound formed when ethene reacts with Hydrogen is ________. (CH4, C2H6, C3H8)

Chapter: [9] Organic Chemistry
Concept: Alcohols - Concept of Ethanol
[5]1.2

Choose the correct answer from the options given below:

A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide is:

1) Calcium chloride

2) Ferrous chloride

3) Ferric chloride

4) Copper chloride

Chapter: [4] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide
Concept: On Solution of Salts - Special Action of Ammonium Hydroxide on Solutions of Copper Salt

Choose the correct answer from the options given below:

If the molecular formula of an organic compound is C10H18 it is:

1) alkene

2) alkane

3) alkyne

4) Not a hydrocarbon

Chapter: [9] Organic Chemistry
Concept: Organic Chemistry - Hydrocarbons - Alkynes

Choose the correct answer from the options given below:

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

1) high melting point

2) consists of molecules

3) always soluble in water

4) Conducts electricity when it is in the molten state

Chapter: [2] Chemical Bonding
Concept: Characteristic Properties of Covalent Compounds

Choose the correct answer from the options given below

To increase the pH value of a neutral solution, we should add:

1) an acid

2) an acid salt

3) an alkali

4) a salt

Chapter: [3] Study of Acids, Bases and Salts
Concept: Use of Litmus and pH Paper to Test for Acidity and Alkalinity

Choose the correct answer from the options given below:

Anhydrous iron(III) chloride is prepared by:

1) direct combination

2) simple displacement

3) decomposition

4) neutralization

Chapter: [1] Understanding Metals and Non-Metals
Concept: Metals and Nonmetals - Concept of Metals and Non-metals
[5]1.3

Identify the substance underlined, in the following case

Cation that does not form a precipitate with ammonium hydroxide but forms one with sodium hydroxide

Chapter: [4] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide
Concept: On Solution of Salts - Sodium Hydroxide on Ammonium Salts

Identify the substance underlined, in the following case

The electrolyte used for electroplating an article with silver.

Chapter: [6] Electrolysis
Concept: Applications of Electrolysis - Electroplating with Nickel and Silver

Identify the substance underlined, in the following case

The particles present in a liquid such as kerosene, that is a nonelectrolyte.

Chapter: [6] Electrolysis
Concept: Electrolysis - Electrolytes and Non-Electrolytes

Identify the substance underlined, in the following case

An organic compound containing – COOH functional group

Chapter: [9] Organic Chemistry
Concept: Concept of Organic Compounds

Identify the substance underlined, in the following case

A solid formed by reaction of two gases, one of which is acidic and the other basic in nature

Chapter: [3] Study of Acids, Bases and Salts
Concept: General Properties of Salts:
[5]1.4

Write a balanced chemical equation for the following:

Action of cold and dilute Nitric acid on Copper

Chapter: [8.03] Nitric Acid
Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate

Write a balanced chemical equation for the following:

Reaction of Ammonia with heated copper oxide.

Chapter: [8.02] Ammonia
Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine

Write a balanced chemical equation for the following:

Preparation of methane from iodomethane.

Chapter: [3] Study of Acids, Bases and Salts
Concept: Preparation - Laboratory Preparation of Salts (Normal and Acid Salts) – Relevant Laboratory

Write a balanced chemical equation for the following:

Action of concentrated sulphuric acid on Sulphur.

Chapter: [8.04] Sulphuric Acid
Concept: Sulphuric Acid - Oxidizing Agent When Concentrated

Write a balanced chemical equation for the following:

Laboratory preparation of ammonia from ammonium chloride.

Chapter: [8.02] Ammonia
Concept: Ammonia - Laboratory Preparation
[5]1.5

State one relevant observation for given reactions:

Addition of ethyl alcohol to acetic acid in the presence of concentrated Sulphuric acid

Chapter: [8.04] Sulphuric Acid
Concept: Sulphuric Acid - Oxidizing Agent When Concentrated

State one relevant observation for given reactions:

Action of dilute Hydrochloric acid on iron (II) sulfide.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Acidic Properties of Its Solution

State one relevant observation for given reactions:

Action of Sodium hydroxide solution on ferrous sulfate solution.

Chapter: [4] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide
Concept: On Solution of Salts - Sodium Hydroxide on Ammonium Salts

State one relevant observation for given reactions:

Burning of ammonia in air.

Chapter: [8.02] Ammonia
Concept: Burning of Ammonia in Oxygen

State one relevant observation for given reactions:

Action of concentrated Sulphuric acid on hydrated copper sulfate

Chapter: [8.04] Sulphuric Acid
Concept: Sulphuric Acid - Oxidizing Agent When Concentrated
[5]1.6

Draw the structural formula for 2, 3 – dimethyl butane

Chapter: [9] Organic Chemistry
Concept: Organic Chemistry - Simple Nomenclature

Draw the structural formula for Diethyl ether

Chapter: [9] Organic Chemistry
Concept: Concept of Organic Compounds

Draw the structural formula for Propanoic acid

Chapter: [9] Organic Chemistry
Concept: Organic Chemistry - Simple Nomenclature

Select the process from the following which matches the given description.
(calcination, roasting, pulverisation, smelting)

Crushing of the ore into a fine powder.

Chapter: [7] Metallurgy
Concept: Metals and Their Alloys - Common Ores of Iron, Aluminium and Zinc

Select the process from the following which matches the given description.
(calcination, roasting, pulverisation, smelting)

Heating of the ore in the absence of air to a high temperature.

Chapter: [7] Metallurgy
Concept: Metals and Their Alloys - Common Ores of Iron, Aluminium and Zinc
[5]1.7

Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Relation Between Atomic Number for Light Elements (Proton Number) and Atomic Mass for Light Elements

Calculate the percentage of water of crystallization in CuSO4.5H2O

(H = 1, O = 16, S = 32, Cu = 64)

Chapter: [5] Mole Concept and Stoichiometry
Concept: Mole Concept

A compound of X and Y has the empirical formula XY2. Its vapor density is equal to its empirical formula weight. Determine its molecular formula.

Chapter: [5] Mole Concept and Stoichiometry
Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
[5]1.8

Match the atomic number 2, 4, 8, 15 and 19 with each of the following

1) A solid non metal belonging to the third period.

2) A metal of valency 1.

3) A gaseous element with valency 2.

4) An element belonging to Group 2

5) A rare gas.

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodicity on the Basis of Atomic Number for Elements
[10]2
[4]2.1

Arrange the following as per the instruction given in the brackets:

He, Ar, Ne (Increasing order of the number of electron shells)

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

Arrange the following as per the instruction given in the brackets:

Na, Li, K (Increasing Ionisation Energy)

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

Arrange the following as per the instruction given in the brackets :

F, Cl, Br (Increasing electronegativity)

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodic Properties - Electronegativity

Arrange the following as per the instruction given in the brackets:

Na, K, Li (Increasing atomic size)

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodic Properties - Atomic Size
[2]2.2

State the type of Bonding in the following molecules:

Water

Chapter: [2] Chemical Bonding
Concept: Concept of Covalent Bond

State the type of Bonding in the following molecules:

Calcium oxide

Chapter: [2] Chemical Bonding
Concept: Concept of Electrovalent
[2]2.3 | Answer the following questions:

How will you distinguish between Ammonium hydroxide and Sodium hydroxide using copper sulphate solution?

Chapter: [4] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide
Concept: On Solution of Salts - Special Action of Ammonium Hydroxide on Solutions of Copper Salt

How will you distinguish between dilute hydrochloric acid and dilute sulphuric acid using lead nitrate solution?

Chapter: [8.04] Sulphuric Acid
Concept: Sulphuric Acid - Behaviour as an Acid When Dilute
[2]2.4

Identify the salts P and Q from the observations given below:

On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in Ammonium hydroxide solution.

Chapter: [4] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide
Concept: Formation and Colour of Hydroxide Precipitated for Solutions of Salts of Ca, Fe, Cu, Zn and Pb

When dilute HCl is added to a salt Q, a brisk effervescence is produced and the gas turns lime water milky.

When NH4OH solution is added to the above mixture (after adding dilute HCl), it produces a white precipitate which is soluble in excess NH4OH solution.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Density and Solubility of Hydrogen Chloride (Fountain Experiment)
[10]3
[4]3.1

Draw an electron dot diagram to show the formation of each of the following compounds:

Methane

[H = 1, C = 6, Mg = 12, Cl = 17]

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

Draw an electron dot diagram to show the formation of each of the following compounds:

Magnesium Chloride

[H = 1, C = 6, Mg = 12, Cl = 17]

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodic Properties - Electron Affinity
[4]3.2

State the observations at the anode and at the cathode during the electrolysis of fused lead bromide using graphite electrodes

Chapter: [6] Electrolysis
Concept: Electrolysis - Electrolytes and Non-Electrolytes

State the observations at the anode and at the cathode during the electrolysis of copper sulphate solution using copper electrodes.

Chapter: [6] Electrolysis
Concept: Electrolysis - Electrolytes and Non-Electrolytes
[2]3.3

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions given below:

SO_4^(2-) , NO_3^- and OH^-

Chapter: [6] Electrolysis
Concept: Electrolysis - Substances Containing Ions Only

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions given below:

Pb^(2+) , Ag^+ and Cu^(2+)

Chapter: [6] Electrolysis
Concept: Electrolysis - Substances Containing Ions Only
[10]4
[5]4.1

Certain blank spaces are left in the following table and these are labelled as A, B, C, D
and E. Identify each of them

 Lab preparation of Reactants used Products formed Drying Agent Method ofcollection 1 HCl gas NaCl + H2SO4 conc. H2SO4 2 NH3 gas Mg(OH)2 NH3

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
[3]4.2

Write balanced chemical equations to show : The oxidizing action of conc. Sulphuric acid on carbon

Chapter: [8.04] Sulphuric Acid
Concept: Sulphuric Acid - Oxidizing Agent When Concentrated

Write balanced chemical equations to show The behavior of H2SO4 as an acid when it reacts with Magnesium

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Acidic Properties of Its Solution

Write balanced chemical equations to show The dehydrating property of conc. Sulphuric acid with sugar.

Chapter: [8.04] Sulphuric Acid
Concept: Sulphuric Acid - Dehydrating Agent
[2]4.3

Write balanced chemical equations to show how SO3 is converted to Sulphuric acid in the contact process.

Chapter: [8.04] Sulphuric Acid
Concept: Non-volatile Nature of Sulphuric Acid
[10]5
[4]5.1

Propane burns in air according to the following equation:

C3H8 + 5O2 → 3CO2 + 4H2O

What volume of propane is consumed on using 1000 cm3 of air, considering only 20% of air contains oxygen?

Chapter: [5] Mole Concept and Stoichiometry
Concept: Gay Lussac’s Law of Combining Volumes

The mass of 11.2 litres of a certain gas at s.t.p. is 24 g. Find the gram molecular mass of the gas

Chapter: [5] Mole Concept and Stoichiometry
Concept: Molar Volume of a Gas at S.T.P
[4]5.2

A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure

1) Find the number of moles of hydrogen present.

2) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H = 1, C = 12, O = 16)

3) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder under the same conditions of temperature and pressure.

4) State the law that helped you to arrive at the above result.

Chapter: [5] Mole Concept and Stoichiometry
Concept: Mole Concept
[2]5.3

Write a balanced chemical equation for the preparation of the following salts

Copper carbonate

Chapter: [3] Study of Acids, Bases and Salts
Concept: Preparation - Laboratory Preparation of Salts (Normal and Acid Salts) – Relevant Laboratory

Write a balanced chemical equation for the preparation of the following salts

Ammonium sulphate crystals

Chapter: [8.02] Ammonia
Concept: Ammonia - Laboratory Preparation
[10]6
[4]6.1

Give a balanced chemical equation for Action of conc. Nitric acid on Sulphur

Chapter: [8.03] Nitric Acid
Concept: Nitric Acid as an Oxidizing Agent.

Give a balanced chemical equation for Catalytic oxidation of Ammonia

Chapter: [8.02] Ammonia
Concept: Catalytic Oxidation of Ammonia as the Source of Nitric Acid

Give a balanced chemical equation for Laboratory preparation of Nitric acid.

Chapter: [8.03] Nitric Acid
Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate

Give a balanced chemical equation for Reaction of Ammonia with Nitric acid

Chapter: [8.02] Ammonia
Concept: Catalytic Oxidation of Ammonia as the Source of Nitric Acid
[4]6.2

Identify the term or substance based on the descriptions given below

Ice like crystals formed on cooling an organic acid sufficiently.

Chapter: [9] Organic Chemistry
Concept: Carboxylic Acids - Concept of Acetic Acid

Identify the term or substance based on the descriptions given below:

Hydrocarbon containing a triple bond used for welding purposes.

Chapter: [9] Organic Chemistry
Concept: Structure of Compounds with Single, Double and Triple Bonds

Identify the term or substance based on the descriptions given below:

The property by virtue of which the compound has the same molecular formula but different structural formulae.

Chapter: [5] Mole Concept and Stoichiometry
Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound

The compound formed where two alkyl groups are linked by  group.

Chapter: [9] Organic Chemistry
Concept: Organic Chemistry - Hydrocarbons - Alkynes
[2]6.3

Give a balanced chemical equation for Preparation of ethane from Sodium propionate

Chapter: [9] Organic Chemistry
Concept: Alcohols - Concept of Ethanol

Give a balanced chemical equation for Action of alcoholic KOH on bromethane

Chapter: [9] Organic Chemistry
Concept: Alcohols - Concept of Ethanol
[10]7
[4]7.1

Name the following :

The process of coating of iron with zinc

Chapter: [6] Electrolysis
Concept: Choice of Electrolyte for Electroplating

Name the following:

An alloy of lead and tin that is used in electrical circuits.

Chapter: [6] Electrolysis
Concept: Electrolysis - Electrolytes and Non-Electrolytes

Name the following:

An ore of zinc containing its sulphide.

Chapter: [7] Metallurgy
Concept: Metals and Their Alloys - Common Ores of Iron, Aluminium and Zinc

Name the following:

A metal oxide that can be reduced by hydrogen.

Chapter: [7] Metallurgy
Concept: Reduction of Metallic Oxides
[3]7.2

Answer the following questions with respect to the electrolytic process in the extraction of aluminum:

Identify the components of the electrolyte other than pure alumina and the role played by each

Chapter: [7] Metallurgy
Concept: Metals and Their Alloys - Extraction of Aluminium

Answer the following questions with respect to the electrolytic process in the extraction of aluminum:

Explain why powdered coke is sprinkled over the electrolytic mixture.

Chapter: [7] Metallurgy
Concept: Metals and Their Alloys - Extraction of Aluminium
[3]7.3

Complete the following by selecting the correct option from the choices given:

The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________. (Al/Cu/Zn/Fe)

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Acidic Properties of Its Solution

Complete the following by selecting the correct option from the choices given:

The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ____________. (Fe/Mg/Pb/Al)

Chapter: [7] Metallurgy
Concept: Reduction of Metallic Oxides

Complete the following by selecting the correct option from the choices given:

The divalent metal whose oxide is reduced to metal by electrolysis of its fused salt is __________. (Al/Na/Mg/K)

Chapter: [6] Electrolysis
Concept: Acids, Bases and Salts as Electrolytes
S