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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: 80Date: 2014-2015 March

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: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
Chapter: [0.081] 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: Hydrogen Chloride - Reaction with Ammonia
Chapter: [0.083] 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: Organic Chemistry - 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: Organic Chemistry - 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: Hydrogen Chloride - Acidic Properties of Its Solution
Chapter: [0.083] 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 - Electronegativity
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical

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: Organic Chemistry - 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: Metals and Nonmetals - Concept of Metals and Non-metals
Chapter:

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: Concept of 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: Periodicity on the Basis of Atomic Number for Elements
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[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: Relation Between Atomic Number for Light Elements (Proton Number) and Atomic Mass for Light Elements
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[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: Molar Volume of a Gas at 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: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition 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: Nitric Acid as an Oxidizing Agent.
Chapter: [0.08199999999999999] 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: Alcohols - Concept of Ethanol
Chapter: [0.09] Organic Chemistry

State one relevant observation for the following

When hydrogen sulfide gas is passed through lead acetate solution.

Concept: Hydrogen Chloride - Acidic Properties of Its Solution
Chapter: [0.083] Hydrogen Chloride

State one relevant observation for the following

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

Concept: Burning of Ammonia in Oxygen
Chapter: [0.081] 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 - Purification of Copper
Chapter:
[5]1.5 | Identify the acid which matches the following description

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

Concept: Non-volatile Nature of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

The acid which produces sugar charcoal from sugar

Concept: Sulphuric Acid - Oxidizing Agent When Concentrated
Chapter: [0.084] Sulphuric Acid

The acid which is prepared by catalytic oxidation of ammonia.

Concept: Catalytic Oxidation of Ammonia as the Source of Nitric Acid
Chapter: [0.081] Ammonia

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

Concept: Sulphuric Acid - Oxidizing Agent When Concentrated
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: Hydrogen Chloride - Acidic Properties of Its Solution
Chapter: [0.083] 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 Metallic Oxides
Chapter: [0.07] Metallurgy

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

Concept: Concept of 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: Acids, Bases and Salts as Electrolytes
Chapter:

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: Sulphuric Acid - Behaviour as an Acid When Dilute
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 - Substances Containing Ions Only
Chapter:
[5]1.7
[3]1.7.1

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

 

Concept: Vapour Density and Its Relation to 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: Electrolysis - Electrolytes and Non-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: Concept of Covalent Bond
Chapter: [0.02] Chemical Bonding
[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: Periodicity on the Basis of Atomic Number for Elements
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[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 - Metallic Character
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical

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

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

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

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

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

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

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

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

Concept: Periodic Properties - Metallic Character
Chapter: [0.01] Periodic Properties and Variations of Properties:- Physical and Chemical
[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 (Naoh, Koh) on Certain Metals, Their Oxides and Hydroxides
Chapter: [0.04] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide

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 (Naoh, Koh) on Certain Metals, Their Oxides and Hydroxides
Chapter: [0.04] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide

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 (Naoh, Koh) on Certain Metals, Their Oxides and Hydroxides
Chapter: [0.04] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide

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

Give balanced chemical equations for Ethanoic acid to ethyl ethanoate

Concept: Structure of Compounds with Single, Double and Triple Bonds
Chapter: [0.09] Organic Chemistry

Give balanced chemical equations for Calcium carbide to ethyne.

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

Give balanced chemical equations for Sodium ethanoate to methane.

Concept: Carboxylic Acids - Concept of Acetic Acid
Chapter: [0.09] Organic Chemistry
[2]3.2

Using their structural formulae identify the functional group by circling them

Dimethyl ether

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

Using their structural formulae identify the functional group by circling them

Propanone.

Concept: Organic Chemistry - Simple Nomenclature
Chapter: [0.09] Organic Chemistry
[5]3.3

Name the following:

The process by which ethane is obtained from ethane.

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

Name the following:

A hydrocarbon which contributes towards the greenhouse effect.

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

Name the following:

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

Concept: Carboxylic Acids - Concept of Acetic 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: Concept of Covalent Bond
Chapter: [0.02] Chemical Bonding

Name the following:

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

Concept: Organic Chemistry - 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: Concept of 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: Ions Present in Mineral Acids, Alkalis and Salts and Their Solutions
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: Ions Present in Mineral Acids, Alkalis and Salts and Their Solutions
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: Concept of Coordinate Bond
Chapter: [0.02] Chemical Bonding
[3]4.3

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

Concept: Ammonia - Laboratory Preparation
Chapter: [0.081] Ammonia

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

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

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

Concept: Aqueous Solution of Ammonia
Chapter: [0.081] 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: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
Chapter: [0.05] Mole Concept and Stoichiometry
[5]5.2
[3]5.2.1

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

Cryolite

Concept: Metals and Their Alloys - 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: Metals and Their Alloys - Extraction of Aluminium
Chapter: [0.07] Metallurgy

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

Graphite

Concept: Metals and Their Alloys - 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: Metals and Their Alloys - Extraction of Aluminium
Chapter: [0.07] Metallurgy

Explain why Iron sheets are coated with zinc during galvanization.

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

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

Potassium hydrogen carbonate.

Concept: Non-volatile Nature of Sulphuric Acid
Chapter: [0.084] Sulphuric Acid

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

Sulphur

Concept: Non-volatile Nature 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: Non-volatile Nature 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 - Purification of Copper
Chapter:
[1]6.2.2

Write the equation taking place at the anode

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

 Explain the following:

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

Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate
Chapter: [0.08199999999999999] Nitric Acid

Explain the following:

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

Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate
Chapter: [0.08199999999999999] Nitric Acid

Explain the following:

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

Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate
Chapter: [0.08199999999999999] 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: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
Chapter: [0.083] Hydrogen 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.

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

Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
Chapter: [0.083] Hydrogen Chloride
[2]7.2

An element L consists of molecules.

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

Concept: Concept of 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 Metallic Oxides
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: General Properties of 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: General Properties of 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: General Properties of 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: General Properties of Salts:
Chapter: [0.03] Study of Acids, Bases and Salts

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