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Question Paper Solutions - Chemistry 2015 - 2016 ICSE Class 10

SubjectChemistry
Year2015 - 2016 (March)

Question 1 is Compulsory.

Attempt any four from Question 2 to Question 7


Marks: 80
[40]1
[5]1.1

Metals are good _____________ (oxidizing agents / reducing agents) because they are electron __________ (acceptors / donors).

Chapter: [1.03] Metals and Non Metals
Concept: Metals and Nonmetals - Physical Properties - Metal

Electrovalent compounds have ________________ (high / low) melting points.

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

Higher the pH value of a solution, the more ____________ (acidic / alkaline) it is.

Chapter: [7] Metallurgy
Concept: Position of the Metals (Alkali Metals and Alkaline Earth Metals) in the Periodic Table

_____________ (AgCl / PbCl2), a white precipitate is soluble in excess NH4OH

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

Conversion of ethane to ethane is an example of ____________ (hydration / hydrogenation).

Chapter: [9] Organic Chemistry
Concept: Alcohols - Concept of Ethanol
[5]1.2

Choose the correct answer from the options given below

An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is:

(A) 17

(B) 11

(C) 18

(D) 20

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

Choose the correct answer from the options given below :

The ratio between the number of molecules in 2g of hydrogen and 32g of oxygen is :

(A) 1 : 2

(B) 1:0.01

(C) 1:1

(D) 0.01:1 [Given that H = 1, O = 16]

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

Choose the correct answer from the options given below :

The two main metals in Bronze are:

(A) Copper and zinc

(B) Copper and lead

(C) Copper and nickel

(D) Copper and tin

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

Choose the correct answer from the options given below :

The particles present in strong electrolytes are :

(A) Only molecules

(B) Mainly ions

(C) Ions and molecules

(D) Only atoms

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

Choose the correct answer from the options given below :

The aim of the Fountain experiment is to prove that :

(A) HCl turns blue litmus red

(B) HCl is denser than air

(C) HCl is highly soluble in water

(D) HCl fumes in moist air

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Density and Solubility of Hydrogen Chloride (Fountain Experiment)
[5]1.3

Write balanced chemical equations for Action of warm water on AIN.

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

Write balanced chemical equations for Action of hot and concentrated Nitric acid on copper

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

Write balanced chemical equations for Action of Hydrochloric acid on sodium bicarbonate.

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

Write balanced chemical equations for Action of dilute Sulphuric acid on Sodium Sulphite

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

Write balanced chemical equations for Preparation of ethanol from Ethyl Chloride

Chapter: [9] Organic Chemistry
Concept: Alcohols - Concept of Ethanol
[5]1.4

State your observations when Dilute Hydrochloric acid is added to Lead nitrate solution and the mixture is heated.

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

State your observations when Barium chloride solution is mixed with Sodium Sulphate 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 observations when Concentrated Sulphuric acid is added to Sugar Crystals

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

State your observations when Dilute Hydrochloric acid is added to Copper carbonate

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

State your observations when Dilute Hydrochloric acid is added to Sodium thiosulphate.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Acidic Properties of Its Solution
[5]1.5

Identify the term/substance in the following:

The tendency of an atom to attract electrons to itself when combined in a compound.

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

Identify the term/substance in the following:

The method used to separate ore from gangue by preferential wetting

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

Identify the term/substance in the following:

The catalyst used in the conversion of ethyne to ethane.

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

Identify the term/substance in the following:

The type of reactions alkenes undergo.

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

Identify the term/substance in the following:

The electrons present in the outermost shell of an atom.

Chapter: [2] Chemical Bonding
Concept: Concept of Coordinate Bond
[5]1.6

A gas of mass 32 gms has a volume of 20 liters at S.T.P. Calculate the gram molecular weight of the gas.

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

How much Is Calcium oxide formed when 82g of calcium nitrate is heated? Also, find the volume of nitrogen dioxide evolved :

2Ca(NO3)2 → 2CaO+4NO2+O2

(Ca = 40 , N = 14,O = 16)

Chapter: [5] Mole Concept and Stoichiometry
Concept: Molar Volume of a Gas at S.T.P
[5]1.7

Match the salts given in Column I with their method of preparation given in Column II

  Column I   Column II
1 Pb(NO3)2 from PbO A Simple displacement
2 MgCl2 from Mg B Titration
3 FeCl3 from Fe C Neutralization
4 NaNO3 from NaOH D Precipitation
5 ZnCO3 from ZnSO4 E Combination
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
[5]1.8

Write the IUPAC names of the following:

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

Write the IUPAC names of the following:

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

Write the IUPAC names of the following:

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

Rewrite the following sentences by using the correct symbol > (greater than) or < (less than) in the blanks given

The ionization potential of potassium is _________________ that of sodium.

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

Rewrite the following sentences by using the correct symbol > (greater than) or < (less than) in the blanks given

The electronegativity of iodine is ___________ that of Chlorine

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodic Properties - Electronegativity
[10]2
[4]2.1

Use the letters only written in the Periodic Table given below to answer the questions that Follow :

1) State the number of valence electrons in atom J.

2) Which element shown forms ions with a single negative charge?

3)Which metallic element is more reactive than R?

4) Which element has its electrons arranged in four shells?

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodicity on the Basis of Atomic Number for Elements
[2]2.2 | Fill in the blanks by selecting the correct word from the brackets

If an element has a low ionization energy then it is likely to be ______________ (metallic / non metallic).

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

If an element has seven electrons in its outermost shell then it is likely to have the ______________ (largest / smallest) atomic size among all the elements in the same period.

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodic Properties - Atomic Size
[4]2.3

The following table shows the electronic configuration of the elements W, X, Y, Z:

Element w x y z
Electronic
configurations
2, 8, 1 2, 8, 7 2, 5 1

Answer the following questions based on the table above:

1) What type of Bond is formed between :

a) W and X

b) Y and Z

2) What is the formula of the compound formed between :

a) X and Z

b) W and X

Chapter: [1] Periodic Properties and Variations of Properties:- Physical and Chemical
Concept: Periodicity on the Basis of Atomic Number for Elements
[10]3
[3]3.1

Write a balanced chemical equation for Burning of ethane in the plentiful supply of air.

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

Write a balanced chemical equations for Action of water on Calcium carbide

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

Write a balanced chemical equations for Heating of Ethanol at 170°C in the presence of conc. Sulphuric acid

Chapter: [9] Organic Chemistry
Concept: Alcohols - Concept of Ethanol
[3]3.2

Give the structural formulae of 2-methylpropane.

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

Give the structural formulae of Ethanoic acid

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

Give the structural formulae of Butan – 2 -ol

Chapter: [9] Organic Chemistry
Concept: Structure of Compounds with Single, Double and Triple Bonds
[2]3.3

The equation for the reaction when compound A is bubbled through bromine dissolved in carbon tetrachloride is as follows:

1) Draw the structure of A.

2) State your observation during this reaction.

Chapter: [9] Organic Chemistry
Concept: Concept of Organic Compounds
[2]3.4

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.

Fill in the blanks using the appropriate words given below :

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

Hot, concentrated nitric acid reacts with sulphur to form ______________.

Chapter: [8.03] Nitric Acid
Concept: Nitric Acid as an Oxidizing Agent.
[10]4
[2]4.1

Identify the gas evolved and give the chemical test in the following cases

Dilute hydrochloric acid reacts with sodium sulphite.

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

Identify the gas evolved and give the chemical test in the following cases

Dilute hydrochloric acid reacts with iron (II) sulphide.

Chapter: [8.01] Hydrogen Chloride
Concept: Hydrogen Chloride - Preparation of Hydrogen Chloride from Sodium Chloride
[2]4.2

State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solutions :

1) Copper sulphate solution

2) Zinc sulfate solution.

Chapter: [4] Analytical Chemistry:- Use of Ammonium Hydroxide and Sodium Hydroxide
Concept: On Solution of Salts - Special Action of Ammonium Hydroxide on Solutions of Copper Salt
[4]4.3

Write equations for the reactions taking place at the two electrodes (mentioning clearly the name of the electrode) during the electrolysis of Acidified copper sulphate solution with copper electrodes

Chapter: [6] Electrolysis
Concept: Electrolysis - Substances Containing Both Molecules and Ions

Write equations for the reactions taking place at the two electrodes (mentioning clearly the name of the electrode) during the electrolysis of Molten lead bromide with inert electrodes

Chapter: [6] Electrolysis
Concept: Electrolysis - Substances Containing Both Molecules and Ions
[2]4.4

Name the product formed at the anode during the electrolysis of acidified water using platinum electrodes.

Chapter: [6] Electrolysis
Concept: Electrolysis - Elementary Study of the Migration of Ions

Name the metallic ions that should be present in the electrolyte when an article made of copper is to be electroplated with silver.

Chapter: [6] Electrolysis
Concept: Applications of Electrolysis - Electroplating with Nickel and Silver
[10]5
[2]5.1

A gas cylinder contains 12 x 1024 molecules of oxygen gas.

If Avogadro’s number is 6 x 1023; Calculate:

1)The mass of oxygen present in the cylinder.

2) The volume of oxygen at S.T.P. present in the cylinder. [O = 16]

Chapter: [5] Mole Concept and Stoichiometry
Concept: Avogadro’s Law of Volume
[3]5.2

A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapor density is 29, find its molecular formula. [C = 12, H = 11]

Chapter: [5] Mole Concept and Stoichiometry
Concept: Deduction of Simple (Empirical) and Molecular Formula from the Percentage Composition of a Compound
[3]5.3

The equation 4NH3 + 5O2 → 4NO + 6 H2O, represents the catalytic oxidation of ammonia. If 100 cm3 of ammonia is used calculate the volume of oxygen required to oxidize the ammonia completely

Chapter: [8.02] Ammonia
Concept: Catalytic Oxidation of Ammonia as the Source of Nitric Acid
[2]5.4

By drawing an electron dot diagram show the formation of Ammonium ion [Atomic No.: N = 7 and H = 1]

Chapter: [2] Chemical Bonding
Concept: Concept of Coordinate Bond
[10]6
[2]6.1

Name the gas evolved when the following mixtures are heated:

Calcium hydroxide and Ammonium Chloride

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

Name the gas evolved when the following mixtures are heated:

Sodium Nitrite and Ammonium Chloride

Chapter: [8.03] Nitric Acid
Concept: Nitric Acid - Laboratory Method of Preparation of Nitric Acid from Potassium Nitrate Or Sodium Nitrate
[2]6.2

Write balanced chemical equations for the following:

When the excess of ammonia is treated with chlorine.

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

Write balanced chemical equations for the following:

An equation to illustrate the reducing nature of ammonia.

Chapter: [8.02] Ammonia
Concept: Ammonia - Reactions with Hydrogen Chloride and with Hot Copper (Ii) Oxide and Chlorine
[3]6.3

A, B, C, and D summarize the properties of sulphuric acid depending on whether it is dilute or concentrated.

A = Typical acid property

B = Non volatile acid

C = Oxidizing agent

D = Dehydrating agent

Choose the property (A, B, C or D) depending on which is relevant to each of the following

1) Preparation of Hydrogen chloride gas

2) Preparation of Copper sulphate from copper oxide.

3) An action of conc. Sulphuric acid on Sulphur.

Chapter: [8.04] Sulphuric Acid
Concept: Sulphuric Acid - Behaviour as an Acid When Dilute
[3]6.4

Give reasons why Sodium Chloride will conduct electricity only in the fused or aqueous solution state.

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

Give reasons why In the electroplating of an article with silver, the electrolyte sodium argentocyanide solution is preferred over silver nitrate solution.

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

Give reasons why Although copper is a good conductor of electricity, it is a non-electrolyte.

Chapter: [6] Electrolysis
Concept: Electrolysis - Electrolytes and Non-Electrolytes
[10]7
[5]7.1

Name the solution used to react with Bauxite as a first step in obtaining pure aluminum oxide, in the Baeyer’s process

Chapter: [7] Metallurgy
Concept: Metals and Their Alloys - Chemical Method - NaOH for Purifying Bauxite – Baeyer’s Process

Write the equation for the reaction where the aluminum oxide for the electrolytic extraction of aluminum is obtained by heating aluminum hydroxide.

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

Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.

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

Write the equation for the reaction that occurs at the cathode during the extraction of aluminum by electrolysis.

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

Explain why it is preferable to use a number of graphite electrodes as the anode instead of a single electrode, during the above electrolysis.

Chapter: [6] Electrolysis
Concept: Electrolysis - Substances Containing Both Molecules and Ions
[2]7.2

State what would you observe when Washing Soda Crystals are exposed to the atmosphere

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

State what would you observe when The salt ferric chloride is exposed to the atmosphere

Chapter: [3] Study of Acids, Bases and Salts
Concept: Salt - Types of Salts
[3]7.3

Identify the cations in the following case:

NaOH solution, when added to the Solution (A), gives a reddish brown precipitate

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

Identify the cations in the following case :

NH4OH Solution, when added to the Solution (B), gives white ppt which does not dissolve in excess.

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

Identify the cations in the following case:

NaOH Solution, when added to Solution (C), gives white ppt which is insoluble in excess

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