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Question Paper Solutions - Chemistry 2013 - 2014 ICSE Class 10

SubjectChemistry
Year2013 - 2014 (March)

Question 1 is compulsory

Attempt any four From Question 2 to Question 7


Marks: 80
[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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

 

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

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

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

Choose the correct answer from the options given below:

The IUPAC name of acetylene is

A. Propane

B. Propyne

C. Ethene

D. Ethyne

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

Fill in the blanks from the choices given within brackets:

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

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

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).

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

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).

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

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).

Chapter: [8.02] Ammonia
Concept: Aqueous Solution of 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 ___________.

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

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

Give one word or phrase for the following:

Formation of ions from molecules

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

Give one word or phrase for the following:

Electrolytic deposition of a superior metal on a baser metal

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

Give one word or phrase for the following:

Hydrocarbons containing a  functional group

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

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.

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

 

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

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

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

Write balanced equations for Action of warm water on magnesium nitride

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

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 equations for Action of dilute hydrochloric acid on sodium sulfide

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

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

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

Chapter: [8.02] Ammonia
Concept: Aqueous Solution of 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)

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

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

Sodium nitrate and sodium sulphite (using dilute sulphuric acid)

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

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

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

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

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

Ethane and ethene (using alkaline potassium permanganate solution)

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

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

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.

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

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

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

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

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

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

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

Chapter: [8.02] Ammonia
Concept: Aqueous Solution of Ammonia

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

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

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Density and Solubility of Hydrogen Chloride (Fountain Experiment)
[2]2.3

Name the other ion formed when ammonia dissolves in water.

Chapter: [8.02] Ammonia
Concept: Aqueous Solution of Ammonia

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

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

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

Catalytic hydrogenation of ethyne

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

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

Preparation of ethyne from ethylene dibromide

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

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

Catalytic oxidation of ammonia to nitric oxide

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

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

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

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

State the main components of the following alloys:

Brass

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

State the main components of the following alloys:

Duralumin

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

State the main components of the following alloys:

Bronze

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

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

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

Give the structural formula of Ethanol

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

Give the structural formula of 1-propanal

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

Give the structural formulae of Ethanoic acid

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

Give the structural formula for 1, 2-dichloroethane

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

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

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

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

State the inference drawn from the following observations:

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

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

State the inference drawn from the following observations

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

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

State the inference drawn from the following observations:

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

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

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

Chapter: [1] Understanding Metals and Non-Metals
Concept: Occurrence of Metals - Extracting Metals Towards the Top of the Activity Series

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

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

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
[4]5.2

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

Dehydrating property

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

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

Acidic nature

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

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

As a non-volatile acid

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

Give balanced chemical equations to prepare the following salts

Lead sulphate from lead carbonate

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

Give balanced chemical equations to prepare the following salts:

Sodium sulphate using dilute sulphuric acid

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

Give balanced chemical equations to prepare the following salts

Copper chloride using copper carbonate

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

State Avogadro's Law

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

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]

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

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

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

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

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

Name the kind of particles present in Sodium hydroxide solution

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

Name the kind of particles present in Carbonic acid

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

Name the kind of particles present in the Sugar solution

Chapter: [3] Atoms and Molecules
Concept: Molecule - Concept of Molecule
[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?

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

Chapter: [1.03] Metals and Non Metals
Concept: Occurrence of Metals - Extracting Metals in the Middle of the Activity Series
S