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Chemistry Science Paper 2 2013-2014 ICSE Class 10 Question Paper Solution

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Chemistry
Science Paper 2
2013-2014 March
Marks: 80

Question 1 is compulsory

Attempt any four From Question 2 to Question 7


[40]1
[10]1.1

Choose the correct answer from the options given below:

Ionisation potential increases over a period from left to right because of the

(A) Atomic radius increases and nuclear charge increases

(B) Atomic radius decreases and nuclear charge decreases

(C) Atomic radius increases and nuclear charge decreases

(D) Atomic radius decreases and nuclear charge increases

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

Choose the correct answer from the options given below:

A compound X consists of only molecules. Hence, X will have

A. A crystalline hard structure

B. A low melting point and low boiling point

C. An ionic bond

D. A strong force of attraction between its molecules

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

Choose the correct answer from the options given below:

When fused lead bromide is electrolysed, we observe

A. A silver grey deposit at the anode and a reddish brown deposit at the cathode

B. A silver grey deposit at the cathode and a reddish brown deposit at the anode

C. A silver grey deposit at the cathode and reddish brown fumes at the anode

D. Silver grey fumes at the anode and reddish brown fumes at the cathode

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

Choose the correct answer from the options given below:

The main ore used for the extraction of iron is

A. Haematite

B. Calamine

C. Bauxite

D. Cryolite

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

Choose the correct answer from the options given below:

Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as

A. Smelting

B. Ore-dressing

C. Calcination

D. Bessemerisation

Concept: Corrosion of Iron and Its Prevention
Chapter: [7] Metallurgy

Choose the correct answer from the options given below:

If an element A belongs to Period 3 and Group II, then it will have

A. 3 shells and 2 valence electrons

B. 2 shells and 3 valence electrons

C. 3 shells and 3 valence electrons

D. 2 shells and 2 valence electrons

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

Choose the correct answer from the options given below:

The molecule containing a triple covalent bond is

A. Ammonia

B. Methane

C. Water

D. Nitrogen

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

Choose the correct answer from the options given below:

The electrolyte used for electroplating an article with silver is

A. Silver nitrate solution

B. Silver cyanide solution

C. Sodium argentocyanide solution

D. Nickel sulfate solution

 

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

Choose the correct answer from the options given below:

Aluminum powder is used in thermite welding because

A. It is a strong reducing agent

B. It is a strong oxidizing agent

C. It is corrosion resistant

D. It is a good conductor of heat

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

Choose the correct answer from the options given below:

The IUPAC name of acetylene is

A. Propane

B. Propyne

C. Ethene

D. Ethyne

Concept: Organic Chemistry - Simple Nomenclature
Chapter: [9] Organic Chemistry
[5]1.2

Fill in the blanks from the choices given within brackets:

The basicity of acetic acid is-------- (3, 1, 4).

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

Fill in the blanks from the choices given within brackets:

The compound formed when ethanol reacts with sodium is____ (sodium ethanoate, sodium ethoxide, sodium propanoate).

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

Fill in the blanks from the choices given within brackets

Quicklime is not used to dry HCl gas because_____ (CaO is alkaline, CaO is acidic, CaO is neutral).

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

Fill in the blanks from the choices given within brackets:

Ammonia gas is collected by________ (an upward displacement of air, a downward displacement of water, a downward displacement of air).

Concept: Aqueous Solution of Ammonia
Chapter: [8.01] Ammonia

Fill in the blanks using the appropriate words given below :

(Sulphur dioxide, nitrogen dioxide, Nitric oxide, Sulphuric acid)

Cold, dilute nitric acid reacts with copper to give ___________.

Concept: Nitric Acid as an Oxidizing Agent.
Chapter: [8.02] Nitric Acid
[5]1.3

Give one word or phrase for the following:

The ratio of the mass of a certain volume of gas to the mass of an equal volume of hydrogen under the same conditions of temperature and pressure.

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

Give one word or phrase for the following:

Formation of ions from molecules

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

Give one word or phrase for the following:

Electrolytic deposition of a superior metal on a baser metal

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

Give one word or phrase for the following:

Hydrocarbons containing a  functional group

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

Give one word or phrase for the following:

The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.

Concept: Periodic Properties - Electron Affinity
Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
[5]1.4

Match the options A to E with the statements

A Alkyne 1 No. of molecules in 22.4 dm-3 of carbon
dioxide at STP
B Alkane 2 An element with the electronic configuration 2,8,8,3
C Iron 3 CnH2n + 2
D 6.023 × 1023 4 CnH2n − 2
E Metal 5 The metal which forms two types of ions

 

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [9] Organic Chemistry
[5]1.5

Write balanced equations for Action of heat on a mixture of copper and concentrated nitric acid

Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate
Chapter: [8.02] Nitric Acid

Write balanced equations for Action of warm water on magnesium nitride

Concept: Nitric Acid as an Oxidizing Agent.
Chapter: [8.02] Nitric Acid

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

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

Write balanced equations for Action of dilute hydrochloric acid on sodium sulfide

Concept: Hydrogen Chloride - Acidic Properties of Its Solution
Chapter: [8.03] Hydrogen Chloride

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

Concept: Alcohols - Concept of Ethanol
Chapter: [9] Organic Chemistry
[5]1.6

Distinguish between the given pairs of compounds using the test given within brackets:

Iron (II) sulfate and iron (III) sulfate (using ammonium hydroxide)

Concept: Aqueous Solution of Ammonia
Chapter: [8.01] Ammonia

Distinguish between the given pairs of compounds using the test given within brackets:

A lead salt and a zinc salt (using excess ammonium hydroxide)

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

Distinguish between the given pairs of compounds using the test given within brackets:

Sodium nitrate and sodium sulphite (using dilute sulphuric acid)

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

Distinguish between the given pairs of compounds using the test given within brackets:

Dilute sulphuric acid and dilute hydrochloric acid (using barium chloride solution)

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

Distinguish between the given pairs of compounds using the test given within brackets:

Ethane and ethene (using alkaline potassium permanganate solution)

Concept: Organic Chemistry - Hydrocarbons - Alkanes
Chapter: [9] Organic Chemistry
[5]1.7

Oxygen oxidizes ethyne to carbon dioxide and water as shown by the equation:

2C2H2 + 5O2 → 4CO2 + 2H2O

What is a volume of ethyne gas at STP required to produce 8.4 dm3 of carbon dioxide at STP? [H = 1, C = 12, O = 16]

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

A compound made up of two elements X and Y has an empirical formula X2Y. If the atomic weight of X is 10 and that of Y is 5 and the compound ha a vapor density 25, find its molecular formula.

Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
Chapter: [5] Mole Concept and Stoichiometry
[10]2
[5]2.1

State your observation in given case When dilute hydrochloric acid is added to sodium carbonate crystals

Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
Chapter: [8.03] Hydrogen Chloride

State your observation When excess sodium hydroxide is added to calcium nitrate solution

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

State your observation At the cathode, when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.

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

State your observation When calcium hydroxide is heated with ammonium chloride crystals.

Concept: Aqueous Solution of Ammonia
Chapter: [8.01] Ammonia

State your observation When moist starch iodide paper is introduced into chlorine gas.

Concept: Hydrogen Chloride - Acidic Properties of Its Solution
Chapter: [8.03] Hydrogen Chloride
[3]2.2

Study the figure given below and answer the questions which follow:

1) Identify the gas Y.

2) What property of gas Y does this experiment demonstrate?

3) Name another gas which has the same property and can be demonstrated through this experiment.

Concept: Hydrogen Chloride - Density and Solubility of Hydrogen Chloride (Fountain Experiment)
Chapter: [8.03] Hydrogen Chloride
[2]2.3

Name the other ion formed when ammonia dissolves in water.

Concept: Aqueous Solution of Ammonia
Chapter: [8.01] Ammonia

Give one test which can be used to detect the presence of the ion produced

Concept: Use of Litmus and pH Paper to Test for Acidity and Alkalinity
Chapter: [3] Study of Acids, Bases and Salts
[10]3
[5]3.1

State the conditions required for the given reaction to take place:

Catalytic hydrogenation of ethyne

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

State the conditions required for the given reaction to take place:

Preparation of ethyne from ethylene dibromide

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

State the conditions required for the given reaction to take place:

Catalytic oxidation of ammonia to nitric oxide

Concept: Catalytic Oxidation of Ammonia as the Source of Nitric Acid
Chapter: [8.01] Ammonia

State the conditions required for the given reaction to take place:

Any two conditions for the conversion of sulphur dioxide to sulphur trioxide

Concept: Sulphuric Acid - Dehydrating Agent
Chapter: [8.04] Sulphuric Acid
[3]3.2

State the main components of the following alloys:

Brass

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

State the main components of the following alloys:

Duralumin

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

State the main components of the following alloys:

Bronze

Concept: Metals and Their Alloys - Common Ores of Iron, Aluminium and Zinc
Chapter: [7] Metallurgy
[2]3.3

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

Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate
Chapter: [8.02] Nitric Acid

Give balanced equations for Preparation of ethanol from monochloroethane and aq. sodium hydroxide

Concept: Alcohols - Concept of Ethanol
Chapter: [9] Organic Chemistry
[10]4
[4]4.1

Give the structural formula of Ethanol

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

Give the structural formula of 1-propanal

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

Give the structural formulae of Ethanoic acid

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

Give the structural formula for 1, 2-dichloroethane

Concept: Organic Chemistry - Homologous Series
Chapter: [9] Organic Chemistry
[2]4.2

Draw the structure of the stable positive ion formed when an acid dissolves in water.

Concept: Ions Present in Mineral Acids, Alkalis and Salts and Their Solutions
Chapter: [3] Study of Acids, Bases and Salts
[4]4.3

State the inference drawn from the following observations:

On carrying out the flame test with a salt P, a brick red flame was obtained. What is the cation in P?

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

State the inference drawn from the following observations:

A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.

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

State the inference drawn from the following observations

pH of liquid R is 10. What kind of substance is R?

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

State the inference drawn from the following observations:

Salt S is prepared by reacting dilute sulphuric acid with copper oxide. Identify S.

Concept: Sulphuric Acid - Behaviour as an Acid When Dilute
Chapter: [8.04] Sulphuric Acid
[10]5
[2]5.1

Name the following: The property possessed by metals by which they can be beaten into sheets

Concept: Occurrence of Metals - Extracting Metals Towards the Top of the Activity Series
Chapter: [7] Metallurgy

Name the following: A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminum

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

Name the following:

An ore of zinc containing its sulphide.

Concept: Metals and Their Alloys - Common Ores of Iron, Aluminium and Zinc
Chapter: [7] Metallurgy
[4]5.2

Give one equation to show the following properties of sulphuric acid:

Dehydrating property

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

Give one equation to show the following properties of sulphuric acid:

Acidic nature

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

Give one equation to show the following properties of sulphuric acid:

As a non-volatile acid

Concept: Non-volatile Nature of Sulphuric Acid
Chapter: [8.04] Sulphuric Acid
[4]5.3

Give balanced chemical equations to prepare the following salts

Lead sulphate from lead carbonate

Concept: Salt - Types of Salts
Chapter: [3] Study of Acids, Bases and Salts

Give balanced chemical equations to prepare the following salts:

Sodium sulphate using dilute sulphuric acid

Concept: Salt - Types of Salts
Chapter: [3] Study of Acids, Bases and Salts

Give balanced chemical equations to prepare the following salts

Copper chloride using copper carbonate

Concept: Salt - Types of Salts
Chapter: [3] Study of Acids, Bases and Salts
[10]6
[4]6.1

State Avogadro's Law

Concept: Avogadro’s Law of Volume
Chapter: [5] Mole Concept and Stoichiometry

A cylinder contains 68 g of ammonia gas at STP.

1) What is the volume occupied by this gas?

2) How many moles of ammonia are present in the cylinder?

3) How many molecules of ammonia are present in the cylinder?

[N = 14, H = 1]

Concept: Molar Volume of a Gas at S.T.P
Chapter: [5] Mole Concept and Stoichiometry
[3]6.2

Why do covalent compounds exist as gases, liquids or soft solids?

Concept: Concept of Electrovalent
Chapter: [2] Chemical Bonding

Which electrode—anode or cathode—is the oxidising electrode? Why?

Concept: Concept of Electrovalent
Chapter: [2] Chemical Bonding
[3]6.3

Name the kind of particles present in Sodium hydroxide solution

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

Name the kind of particles present in Carbonic acid

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

Name the kind of particles present in the Sugar solution

Concept: Molecule - Concept of Molecule
Chapter: [3] Study of Acids, Bases and Salts
[10]7
[5]7.1

An element Z has atomic number 16. Answer the following questions on Z:

1) State the period and group to which Z belongs

2) Is Z a metal or a non-metal?

3) State the formula between Z and hydrogen

4) What kind of a compound is this?

Concept: Periodicity on the Basis of Atomic Number for Elements
Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
[5]7.2

M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:

1) What kind of combination exists between M and O?

2)How many electrons are there in the outermost shell of M?

3) Name the group to which M belongs.

4) State the reaction taking place at the cathode.

5) Name the product at the anode.

Concept: Occurrence of Metals - Extracting Metals in the Middle of the Activity Series
Chapter: [7] Metallurgy

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