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Question Paper Solutions - Chemistry 2014 - 2015 ICSE Class 10

SubjectChemistry
Year2014 - 2015 (March)

Question 1 is compulsory.

Attempt any four From Question 2 to Question 7


Marks: 80
[40]1
[5]1.1

Select from the list the gas that matches the description given in case

[ammonia, ethane, hydrogen chloride, hydrogen sulfide, ethyne]

This gas is used as a reducing agent in reducing copper oxide to copper

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

Select from the list the gas that matches the description given in case

[ammonia, ethane, hydrogen chloride, hydrogen sulfide, ethyne]

This gas produces dense white fumes with ammonia gas.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Reaction with Ammonia

Select from the list the gas that matches the description given in case

[ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne]

This gas is used for welding purposes

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

Select from the list the gas that matches the description given in case

[ammonia, ethane, hydrogen chloride, hydrogen sulfide, ethyne]

This gas is also a saturated hydrocarbon

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

Select from the list the gas that matches the description given in case

[ammonia, ethane, hydrogen chloride, hydrogen sulfide, ethyne]

This gas has a characteristic rotten egg smell.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Acidic Properties of Its Solution
[5]1.2

Choose the most appropriate answer of the following:

Among the elements given below, the element with the least electronegativity is:

(A) Lithium

(B) Carbon

(C) Boron

(D) Fluorine

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

Choose the most appropriate answer of the following:

Identify the statement which does not describe the property of alkenes:

(A) They are unsaturated hydrocarbons

(B) They decolorize bromine water

(C) They can undergo addition as well as substitution reactions

(D) They undergo combustion with oxygen forming carbon dioxide and water.

Chapter: [9] Organic Chemistry
Concept: Organic Chemistry - Hydrocarbons - Alkenes,

Choose the most appropriate answer of the following:

This is not an alloy of copper:

(A) Brass

(B) Bronze

(C) Solder

(D) Duralumin.

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

Choose the most appropriate answer of the following:

Bonding in this molecule can be understood to involve coordinate bonding

(A) Carbon tetrachloride

(B) Hydrogen

(C) Hydrogen chloride

(D) Ammonium chloride

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

Choose the most appropriate answer of the following:

Which of the following would weigh the least?

(A) 2-gram atoms of Nitrogen.

(B) 1mole of Silver

(C) 22.4 liters of oxygen gas at 1 atmospheric pressure and 273K

(D) 6.02 x 1023 atoms of carbon.

[Atomic masses: Ag=108, N=14, O=16, C=12]

 

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodicity on the Basis of Atomic Number for Elements
[5]1.3 | Complete the following calculations. Show working for complete credit:
[2]1.3.1

Calculate the mass of Calcium that will contain the same number of the atom as are present in 3.2 gm of Sulphur.

[Atomic masses: S=32, Ca=40]

 

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
[2]1.3.2

If 6 liters of hydrogen and 4 liters of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.

Chapter: [5] Mole Concept and Stoichiometry
Concept: Molar Volume of a Gas at S.T.P
[1]1.3.3

If the empirical formula of a compound is CH and it has a vapor density of 13, find the molecular formula of the compound.

Chapter: [5] Mole Concept and Stoichiometry
Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
[5]1.4

State one relevant observation for the following

When crystals of copper nitrate are heated in a test tube

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

State one relevant observation for the following

When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.

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

State one relevant observation for the following

When hydrogen sulfide gas is passed through lead acetate solution.

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

State one relevant observation for the following

When ammonia gas is burnt in an atmosphere of excess oxygen.

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

State one relevant observation for the following

At the Anode when aqueous copper sulfate solution is electrolysed using copper electrodes.

Chapter: [6] Electrolysis
Concept: Applications of Electrolysis - Purification of Copper
[5]1.5 | Identify the acid which matches the following description

The acid which is used in the preparation of a volatile acid

Chapter: [8.04] Sulphuric Acid
Concept: Non-volatile Nature of Sulphuric Acid

The acid which produces sugar charcoal from sugar

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

The acid which is prepared by catalytic oxidation of ammonia.

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

The acid on mixing with lead nitrate solution produces a white precipitate which is insoluble even on heating

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

The acid on mixing with silver nitrate solution produces a white precipitate which is soluble in excess ammonium hydroxide

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Acidic Properties of Its Solution
[5]1.6

Give appropriate scientific reasons for Zinc oxide can be reduced to zinc metal by using
carbon, but aluminium oxide cannot be reduced by a reducing agent

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

Give appropriate scientific reasons for Carbon tetrachloride does not conduct electricity.

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

Give appropriate scientific reasons for During electrolysis of molten lead bromide, graphite anode is preferred to other electrodes.

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

Give appropriate scientific reasons for The electrical conductivity of acetic acid is less in comparison to the electrical conductivity of dilute sulphuric acid at a given concentration.

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

Give appropriate scientific reasons for Electrolysis is of molten lead bromide is considered to be a redox reaction.

Chapter: [6] Electrolysis
Concept: Electrolysis - Substances Containing Ions Only
[5]1.7
[3]1.7.1

Give balanced chemical equations for the following conversions A, B, and C:

 

Chapter: [5] Mole Concept and Stoichiometry
Concept: Relative Atomic Masses (Atomic Weight) and Relative Molecular Masses (Molecular Weights)
[2]1.7.2

Differentiate between the terms strong electrolyte and weak electrolyte. (stating any two differences)

Chapter: [6] Electrolysis
Concept: Electrolysis - Electrolytes and Non-Electrolytes
[5]1.8 | Answer the following questions:
[2]1.8.1

Explain the bonding in methane molecule using electron dot structure.

Chapter: [2] Chemical Bonding
Concept: Concept of Covalent Bond
[3]1.8.2

The metal of Group 2 from top to bottom arc Be, Mg, Ca, Sr, and Ba.

1) Which one of these elements will form ions most readily and why?

2) State the common feature in the electronic configuration of all these elements.

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 instructions given in the brackets

Cs, Na, Li, K, Rb (increasing order of metallic character).

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

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

Mg, Cl, Na, S, Si (decreasing order of atomic size).

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

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

Na, K, Cl, S, Si (increasing order ionization energy)

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

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

Cl, F, Br, I (increasing order of electron affinity)

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodic Properties - Metallic Character
[4]2.2

Choose the most appropriate answer from the following list of oxides which fit the description

[SO2, SiO2, Al2O3, MgO, CO, Na2O]

A basic oxide.

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

Choose the most appropriate answer from the following list of oxides which fit the description

[SO2, SiO2, Al2O3, MgO, CO, Na2O]

An oxide which dissolves in water forming an acid

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

Choose the most appropriate answer from the following list of oxides which fit the description

[SO2, SiO2, Al2O3, MgO, CO, Na2O]

An amphoteric oxide

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

Choose the most appropriate answer from the following list of oxides which fit the description

[SO2, SiO2, Al2O3, MgO, CO, Na2O]

A covalent oxide of a metalloid.

Chapter: [2] Chemical Bonding
Concept: Concept of Covalent Bond
[2]2.3

Element X is a metal with a valency 2, Y is 3 non- metal with a valency 3.

1) Write an equation to show how Y from an ion.

2) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodic Properties - Electron Affinity
[10]3
[3]3.1

Give balanced chemical equations for Ethanoic acid to ethyl ethanoate

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

Give balanced chemical equations for Calcium carbide to ethyne.

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

Give balanced chemical equations for Sodium ethanoate to methane.

Chapter: [9] Organic Chemistry
Concept: Carboxylic Acids - Concept of Acetic Acid
[2]3.2

Using their structural formulae identify the functional group by circling them

Dimethyl ether

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

Using their structural formulae identify the functional group by circling them

Propanone.

Chapter: [9] Organic Chemistry
Concept: Organic Chemistry - Simple Nomenclature
[5]3.3

Name the following:

The process by which ethane is obtained from ethane.

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

Name the following:

A hydrocarbon which contributes towards the greenhouse effect.

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

Name the following:

The distinctive reaction that takes place when ethanol is treated with acetic acid.

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

Name the following:

The property of element by virtue of which atoms of the element can link to each other in the form of a long chain or ring structure.

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

Name the following:

Reaction when an alkyl halide is treated with alcoholic potassium hydroxide.

Chapter: [9] Organic Chemistry
Concept: Organic Chemistry - Hydrocarbons - Alkenes,
[10]4
[3]4.1

Identify the anion present in the following compounds:

A salt M on treatment with concentrated sulphuric acid produces a gas which fumes in moist air and gives dense fumes with ammonia

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

Identify the anion present in the following compounds:

A salt D on treatment with dilute sulphuric acid produces a gas which turns lime water milky but has no effect on acidified potassium dichromate solution

Chapter: [3] Study of Acids, Bases and Salts
Concept: Ions Present in Mineral Acids, Alkalis and Salts and Their Solutions

Identify the anion present in the following compounds:
When barium chloride solution is added to salt solution E a white precipitate insoluble in dilute hydrochloric acid is obtained.

Chapter: [3] Study of Acids, Bases and Salts
Concept: Ions Present in Mineral Acids, Alkalis and Salts and Their Solutions
[4]4.2

The following table shows the test a student performed on four different aqueous solutions which are X, Y, Z and W. Based on the observations provided, identify the cation present:

Chemical test Observation Conclusion
To solution X, ammonium
hydroxide is added in minimum quantity first and then in excess
A dirty white precipitate is
formed which dissolves in
excess to form a clear solution
(1)
To solution Y ammonium
hydroxide is added in the minimum quantity first and then in excess
A pale blue precipitate is
formed which dissolves in
excess to form a clear inky blue
solution.
(2)
To solution W a small quantity of sodium hydroxide solution is
added and then in excess.
A white precipitate is formed
which remains insoluble.
(3)
To a salt Z calcium hydroxide
the solution is added and then
heated.
A pungent smelling gas turning
moist red litmus paper blue is
obtained.
(4)

 

Chapter: [2] Chemical Bonding
Concept: Concept of Coordinate Bond
[3]4.3

Give balanced chemical equations for Lab preparation of ammonia using an ammonium salt

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

Give balanced chemical equations for Reaction of ammonia with excess chlorine.

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

Give balanced chemical equations for Reaction of ammonia with sulphuric acid.

Chapter: [8.02] Ammonia
Concept: Aqueous Solution of Ammonia
[10]5
[5]5.1

Consider the following reaction and based on the reaction answer the questions that follow:

Calculate:

1) the quantity in moles of (NH4)2Cr2O7 if 63gm of(NH4)2Cr2O7 is heated.

2) the quantity in moles of nitrogen formed.

3) the volume in liters or dm3 of N2 evolved at S.T.P.

4) the mass in grams of Cr2O3 formed at the same time

(Atomic masses: H=1, Cr= 52, N=14]

Chapter: [5] Mole Concept and Stoichiometry
Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
[5]5.2
[3]5.2.1

For the Given substance listed below, describe the role played in the extraction of aluminum.

Cryolite

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

For the Given substance listed below, describe the role played in the extraction of aluminum.

Sodium hydroxide

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

For the Given substance listed below, describe the role played in the extraction of aluminum.

Graphite

Chapter: [7] Metallurgy
Concept: Metals and Their Alloys - Extraction of Aluminium
[2]5.2.2

Explain why In the electrolysis of alumina using the Hall Heroult's Process the electrolyte is covered with powdered coke

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

Explain why Iron sheets are coated with zinc during galvanization.

Chapter: [7] Metallurgy
Concept: Corrosion of Iron and Its Prevention
[10]6
[2]6.1

Give balanced chemical equations for the action of sulphuric acid on the following:

Potassium hydrogen carbonate.

Chapter: [8.04] Sulphuric Acid
Concept: Non-volatile Nature of Sulphuric Acid

Give balanced chemical equations for the action of sulphuric acid on the following:

Sulphur

Chapter: [8.04] Sulphuric Acid
Concept: Non-volatile Nature of Sulphuric Acid

In the contact process for the manufacture of sulphuric acid give the equations for the conversion of sulphur trioxide to sulphuric acid.

Chapter: [8.04] Sulphuric Acid
Concept: Non-volatile Nature of Sulphuric Acid
[3]6.2
[2]6.2.1

Copy and complete the following table:

  Anode Electrolyte
Purification of copper    
Chapter: [6] Electrolysis
Concept: Applications of Electrolysis - Purification of Copper
[1]6.2.2

Write the equation taking place at the anode

Chapter: [6] Electrolysis
Concept: Electrolysis - Substances Containing Ions Only
[3]6.3

 Explain the following:

Dilute nitric acid is generally considered a typical acid but not so in its reaction with metals.

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

Explain the following:

Concentrated nitric add appears yellow when it is left standing in a glass bottle.

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

Explain the following:

An all-glass apparatus is used in the 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
[10]7
[4]7.1
[1]7.1.1

The following are pertaining to the laboratory preparation of hydrogen chloride gas.

Write the equation for its preparation mentioning the condition required.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
[2]7.1.2

The following are pertaining to the laboratory preparation of hydrogen chloride gas.

Name the drying agent used and justify your choice.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
[1]7.1.3

The following are pertaining to the laboratory preparation of hydrogen chloride gas.

State a safety precaution you would take during the preparation of hydrochloric acid.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
[2]7.2

An element L consists of molecules.

What type of bonding is present in the particles that make up L?

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

An element L consists of molecules.

When L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L?

Chapter: [7] Metallurgy
Concept: Reduction of Metallic Oxides
[4]7.3

From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:

[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]

A deliquescent salt

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

From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:

[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]

An insoluble chloride.

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

From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:

[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]

On heating, this salt gives a yellow residue when hot and white when cold

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

From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:

[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]

On heating this salt, a brown colored gas is evolved.

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