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Chemistry Science Paper 2 2014-2015 ICSE Class 10 Question Paper Solution

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Chemistry [Science Paper 2]
Marks: 80 Academic Year: 2014-2015
Date: March 2015
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Question 1 is compulsory.

Attempt any four From Question 2 to Question 7


[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

Concept: Chemical Properties of Ammonia
Chapter: [0.08199999999999999] Ammonia

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.

Concept: Chemical Properties of Hydrogen Chloride Gas
Chapter: [0.081] Hydrogen Chloride

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

Concept: Hydrocarbons: Alkynes
Chapter: [0.09] Organic Chemistry

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

Concept: Hydrocarbons: Alkanes
Chapter: [0.09] Organic Chemistry

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.

Concept: General Preparation of Hydrogen Chloride Gas
Chapter: [0.081] Hydrogen Chloride
[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

Concept: Periodic Properties - Periodic Properties: Electronegativity
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties

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.

Concept: Hydrocarbons: Alkenes
Chapter: [0.09] Organic Chemistry

Choose the most appropriate answer of the following:

This is not an alloy of copper:

(A) Brass

(B) Bronze

(C) Solder

(D) Duralumin.

Concept: Types of Elements: Non-metal
Chapter: [0.07] Metallurgy

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

Concept: Coordinate Bond
Chapter: [0.02] Chemical Bonding

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]

 

Concept: Periodic Properties
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties
[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]

 

Concept: Periodic Properties
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties
[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.

Concept: Standard Temperature Pressure (S.T.P.)
Chapter: [0.05] Mole Concept and Stoichiometry
[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.

Concept: Empirical Formula of a Compound
Chapter: [0.05] Mole Concept and Stoichiometry
[5] 1.4

State one relevant observation for the following

When crystals of copper nitrate are heated in a test tube

Concept: Manufacture of Nitric Acid
Chapter: [0.083] Nitric Acid

State one relevant observation for the following

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

Concept: Ethanol
Chapter: [0.09] Organic Chemistry

State one relevant observation for the following

When hydrogen sulfide gas is passed through lead acetate solution.

Concept: General Preparation of Hydrogen Chloride Gas
Chapter: [0.081] Hydrogen Chloride

State one relevant observation for the following

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

Concept: Chemical Properties of Ammonia
Chapter: [0.08199999999999999] Ammonia

State one relevant observation for the following

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

Concept: Applications of Electrolysis
Chapter: [0.06] Electrolysis
[5] 1.5 | Identify the acid which matches the following description

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

Concept: Chemical Properties of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

The acid which produces sugar charcoal from sugar

Concept: Chemical Properties of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

The acid which is prepared by catalytic oxidation of ammonia.

Concept: Chemical Properties of Ammonia
Chapter: [0.08199999999999999] Ammonia

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

Concept: Chemical Properties of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

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

Concept: General Preparation of Hydrogen Chloride Gas
Chapter: [0.081] Hydrogen Chloride
[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

Concept: Reduction of Metal Oxides to Metals
Chapter: [0.07] Metallurgy

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

Concept: The Covalent Bond
Chapter: [0.02] Chemical Bonding

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

Concept: Electrolytes
Chapter: [0.06] Electrolysis

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.

Concept: Chemical Properties of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

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

Concept: Electrolysis
Chapter: [0.06] Electrolysis
[5] 1.7
[3] 1.7.1

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

 

Concept: Relationship Between Vapour Density and Relative Molecular Mass
Chapter: [0.05] Mole Concept and Stoichiometry
[2] 1.7.2

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

Concept: Electrolytes
Chapter: [0.06] Electrolysis
[5] 1.8 | Answer the following questions:
[2] 1.8.1

Explain the bonding in methane molecule using electron dot structure.

Concept: The Covalent Bond
Chapter: [0.02] Chemical Bonding
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[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.

Concept: Periodic Properties
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties
[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).

Concept: Periodic Properties - Periodic Properties: Metallic Character
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties

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

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

Concept: Periodic Properties - Periodic Properties: Metallic Character
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties

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

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

Concept: Periodic Properties - Periodic Properties: Metallic Character
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties

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

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

Concept: Periodic Properties - Periodic Properties: Metallic Character
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties
[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.

Concept: Action of Alkalis on Certain Metals
Chapter: [0.04] Analytical Chemistry

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

Concept: Action of Alkalis on Certain Metals
Chapter: [0.04] Analytical Chemistry

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

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

An amphoteric oxide

Concept: Action of Alkalis on Certain Metals
Chapter: [0.04] Analytical Chemistry

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.

Concept: The Covalent Bond
Chapter: [0.02] Chemical Bonding
[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.

Concept: Periodic Properties - Periodic Properties: Electron Affinity
Chapter: [0.01] Periodic Table, Periodic Properties and Variations of Properties
[10] 3
[3] 3.1

Give balanced chemical equations for Ethanoic acid to ethyl ethanoate

Concept: Isomers
Chapter: [0.09] Organic Chemistry

Give balanced chemical equations for Calcium carbide to ethyne.

Concept: Hydrocarbons: Alkynes
Chapter: [0.09] Organic Chemistry

Give balanced chemical equations for Sodium ethanoate to methane.

Concept: Ethanoic Acid
Chapter: [0.09] Organic Chemistry
[2] 3.2

Using their structural formulae identify the functional group by circling them

Dimethyl ether

Concept: Hydrocarbons: Alkynes
Chapter: [0.09] Organic Chemistry

Using their structural formulae identify the functional group by circling them

Propanone.

Concept: Nomenclature of Organic Compounds (IUPAC)
Chapter: [0.09] Organic Chemistry
[5] 3.3

Name the following:

The process by which ethane is obtained from ethane.

Concept: Hydrocarbons: Alkanes
Chapter: [0.09] Organic Chemistry

Name the following:

A hydrocarbon which contributes towards the greenhouse effect.

Concept: Hydrocarbons: Alkanes
Chapter: [0.09] Organic Chemistry

Name the following:

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

Concept: Ethanoic Acid
Chapter: [0.09] Organic Chemistry

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.

Concept: The Covalent Bond
Chapter: [0.02] Chemical Bonding

Name the following:

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

Concept: Hydrocarbons: Alkenes
Chapter: [0.09] Organic Chemistry
[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

Concept: Coordinate Bond
Chapter: [0.02] Chemical Bonding

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

Concept: Preparation of Insoluble Salts
Chapter: [0.03] Study of Acids, Bases and Salts

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.

Concept: Preparation of Insoluble Salts
Chapter: [0.03] Study of Acids, Bases and Salts
[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)

 

Concept: Coordinate Bond
Chapter: [0.02] Chemical Bonding
[3] 4.3

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

Concept: Laboratory Preparation of Ammonia Gas
Chapter: [0.08199999999999999] Ammonia [0.1] Practical Work

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

Concept: Chemical Properties of Ammonia
Chapter: [0.08199999999999999] Ammonia

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

Concept: Preparation of Aqueous Ammonia
Chapter: [0.08199999999999999] 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]

Concept: Empirical Formula of a Compound
Chapter: [0.05] Mole Concept and Stoichiometry
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[5] 5.2
[3] 5.2.1

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

Cryolite

Concept: Extraction of Aluminium
Chapter: [0.07] Metallurgy

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

Sodium hydroxide

Concept: Extraction of Aluminium
Chapter: [0.07] Metallurgy

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

Graphite

Concept: Extraction of Aluminium
Chapter: [0.07] Metallurgy
[2] 5.2.2

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

Concept: Extraction of Aluminium
Chapter: [0.07] Metallurgy

Explain why Iron sheets are coated with zinc during galvanization.

Concept: Corrosion of Metals and Its Prevention
Chapter: [0.07] Metallurgy
[10] 6
[2] 6.1

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

Potassium hydrogen carbonate.

Concept: Chemical Properties of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

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

Sulphur

Concept: Chemical Properties of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

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

Concept: Chemical Properties of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid
[3] 6.2
[2] 6.2.1

Copy and complete the following table:

  Anode Electrolyte
Purification of copper    
Concept: Applications of Electrolysis
Chapter: [0.06] Electrolysis
[1] 6.2.2

Write the equation taking place at the anode

Concept: Electrolysis
Chapter: [0.06] Electrolysis
[3] 6.3

 Explain the following:

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

Concept: Laboratory Preparation of Nitric Acid
Chapter: [0.083] Nitric Acid

Explain the following:

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

Concept: Laboratory Preparation of Nitric Acid
Chapter: [0.083] Nitric Acid

Explain the following:

An all-glass apparatus is used in the laboratory preparation of nitric acid.

Concept: Laboratory Preparation of Nitric Acid
Chapter: [0.083] Nitric Acid
[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.

Concept: Laboratory Preparation of Hydrogen Chloride Gas
Chapter: [0.081] Hydrogen Chloride [0.1] Practical Work
[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.

Concept: Laboratory Preparation of Hydrogen Chloride Gas
Chapter: [0.081] Hydrogen Chloride [0.1] Practical Work
[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.

Concept: Laboratory Preparation of Hydrogen Chloride Gas
Chapter: [0.081] Hydrogen Chloride [0.1] Practical Work
[2] 7.2

An element L consists of molecules.

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

Concept: The Covalent Bond
Chapter: [0.02] Chemical Bonding

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?

Concept: Reduction of Metal Oxides to Metals
Chapter: [0.07] Metallurgy
[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

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

Concept: Salts
Chapter: [0.03] Study of Acids, Bases and 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

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

Concept: Salts
Chapter: [0.03] Study of Acids, Bases and Salts

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