Chemistry Science Paper 2 2013-2014 (English Medium) ICSE Class 10 Question Paper Solution

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

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

When fused lead bromide is electrolysed, we observe ______.

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

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

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

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

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

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

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

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

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

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

Choose the correct answer from the options given below:

The IUPAC name of acetylene is

A. Propane

B. Propyne

C. Ethene

D. Ethyne

Fill in the blanks from the choices given within brackets:

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

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).

Quicklime is not used to dry \[\ce{HCl}\] gas because _____.

\[\ce{CaO}\] is alkaline.

\[\ce{CaO}\] is acidic.

\[\ce{CaO}\] is neutral.

Ammonia gas is collected by ______.

upward displacement of air

downward displacement of water

downward displacment of air

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 ___________.

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.

Give one word or phrase for the following:

Formation of ions from molecules

Give one word or phrase for the following:

Electrolytic deposition of a superior metal on a baser metal.

Give one word or phrase for the following:

Hydrocarbons containing a  functional group

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.

Match the options A to E with the statements

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

Write balanced equations for action of warm water on magnesium nitride

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

Write balanced equation for action of dilute hydrochloric acid on sodium sulphide

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

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

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

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

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

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

Sodium nitrate and sodium sulphite (using dilute 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)

Distinguish between the given pair of compounds using the test given within bracket:

Ethane and ethene (using alkaline potassium permanganate solution)

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

\[\ce{2C2H2 + 5O2 -> 4CO2 + 2H2O}\]

What volume of ethyne gas at STP required to produce 8.4 dm³ of carbon dioxide at STP?

[H = 1, C = 12, O = 16]

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.

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

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

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

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

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

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.

Name the other ion formed when ammonia dissolves in water.

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

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

Catalytic hydrogenation of ethyne

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

Preparation of ethyne from ethylene dibromide

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

Catalytic oxidation of ammonia to nitric oxide

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

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

State the main components of the following alloys:

Brass

State the main components of the following alloys:

Duralumin

State the main components of the following alloys:

Bronze

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

Give a balanced equation for the preparation of ethanol from monochloroethane and aq. sodium hydroxide.

Give the structural formula of Ethanol

Give the structural formula of 1-propanal

Give the structural formulae of Ethanoic acid.

Give the structural formula for 1, 2-dichloroethane

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

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?

State the inference drawn from the following observations:

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

State the inference drawn from the following observations

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

State the inference drawn from the following observations:

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

Name the following:

The property possessed by metals by which they can be beaten into sheets.

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

Name the following:

An ore of zinc containing its sulphide.

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

Dehydrating property

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

Acidic nature

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

As a non-volatile acid

Give balanced chemical equations to prepare the following salts

Lead sulphate from lead carbonate

Give balanced chemical equation to prepare the following salt:

Sodium sulphate using dilute sulphuric acid.

Give balanced chemical equation to prepare the following salt:

Copper chloride using copper carbonate

State Avogadro's Law.

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]

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

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

Name the kind of particles present in sodium hydroxide solution.

Name the kind of particles present in carbonic acid.

Name the kind of particles present in the sugar solution.

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?

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.