Chemistry Specimen Paper 2024-2025 (English Medium) ICSE Class 10 Question Paper Solution

An aqueous solution of copper sulphate turns colourless on electrolysis.

Which of the following could be the electrodes?

P. anode: copper; cathode: copper

Q. anode: platinum; cathode: copper

R. anode: copper; cathode: platinum

Only P

Only Q

Only R

Both Q and R

A compound P is heated in a test tube with sodium hydroxide solution. A red litmus paper held at the mouth of the test tube turns blue.

Which of the following could compound P be?

Zinc sulphate

Copper sulphate

Ferrous sulphate

Ammonium sulphate

Which of the following would weigh the least?

(Atomic masses C = 12, 0 = 16, Na = 23)

2 gram atoms of oxygen

One mole of sodium

22.4 litres of carbon dioxide at STP

6.023 × 10²² atoms of carbon

The equation below shows the reaction between element ‘X’ and dilute sulphuric acid.

\[\ce{X(s) + H2SO4 (aq.) -> XSO4 (aq.) + H2(g)}\]

Which particles are responsible for conducting electricity in dilute sulfuric acid and compound XSO₄?

Electrons

Only positive ions

Only negative ions

Both positive and negative ions

Assertion (A): Dry hydrogen chloride gas is collected by the upward displacement of air.

Reason (R): Hydrogen chloride gas is lighter than air.

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

The structures of four hydrocarbons are shown below:

How many isomers of butene are there?

1

2

3

4

Element ‘P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of ‘P’ is ______.

2

1

3

4

₁H² is an isotope of hydrogen. In the modern Periodic Table it will ______.

be placed before hydrogen

be placed after hydrogen

be placed at the same position as hydrogen

not have any position in the Periodic Table

A nitrate, which forms a precipitate with ammonium hydroxide and is also soluble in excess of ______.

ferrous nitrate

ferric nitrate

lead nitrate

copper nitrate

Which of the following electronic configuration represents the most electropositive element?

2,1

2, 8, 1

2, 2

2, 8, 2

Assertion (A): Alkali metals do not form dipositive ions.

Reason (R): After loss of one electron alkali metals achieve a stable electronic configuration of noble gases.

Both A and R are true and R is the correct explanation of A

Both A and are true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

The ratio between the volumes occupied by 4.4 grams of carbon dioxide and 2 grams of hydrogen gas is ______.

22:1

1:2.2

1:10

10:1

Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solutions in excess, except:

aqueous potassium chloride aqueous sodium sulphate dilute sulphuric acid sodium hydroxide solution

aqueous sodium sulphate

dilute sulphuric acid

sodium hydroxide solution

Which of the following about oxides is correct?

A basic oxide is an oxide of a non-metal

Acidic oxides contain ionic bonds

Amphoteric oxides contain a metal

Basic oxides are always gases

A student takes Cu, Al, Fe and Zn strips, separately in four test tubes labeled as I, II, III and IV respectively. He adds 10 ml of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.

He would observe a black residue in the test tubes:

(I) and (II)

(I) and (III)

(II) and (III)

(II) and (IV)

Electroplating steel objects with silver involves a three-step process.

Step 1: A coating of copper is applied to the object.

Step 2: A coating of nickel is applied to the object.

Step 3: The coating of silver is applied to the object.

1. 1. A diagram of the apparatus used for step 1 is shown
      
      
      1. The chemical process taking place on the surface of the object is \[\ce{Cu^2+(aq) + 2e- ->Cu(s)}\]
         What is the observation seen on the surface of the object?
      2. Explain why the concentration of copper ions in the electrolyte remains constant throughout step 1.
2. Give two changes which would be needed in order to coat nickel on to the object in step 2.
3. Write down the reaction taking place at the positive electrode during step 3.

Match the following Column A with Column B.

If an element has one electron in the outermost shell, then it is likely to have the ______ atomic size amongst all the elements in the same period.

smallest

largest

______ does not form an acid salt.

Sulphuric acid

Hydrochloric acid

A ______ coloured precipitate is formed when ammonium hydroxide is added to a solution of ferrous chloride.

Reddish brown

Dirty green

Alkynes undergo ______ reactions.

Addition

Substitution

An ______ solution will turn methyl orange solution pink or red.

Alkaline

Acidic

Identify the following:

A bond formed between two atoms by sharing of a pair of electrons, with both electrons being provided by the same atom.

Identify the following:

A salt formed by the complete neutralization of an acid by a base.

Identify the following:

A reaction in which the hydrogen of an alkane is replaced by a halogen.

Identify the following:

The energy required to remove an electron from a neutral gaseous atom.

Identify the following:

A homogenous mixture of two or more metals or a metal and a non-metal in a definite proportion in their molten state.

Draw the structural diagram for the following compound.

propanoic acid

Draw the structural diagram for the following compound.

pentan-2-ol

Draw the structural diagram for the following compound.

2,2 dibromo butane

Give the IUPAC name of the following organic compound:

\[\begin{array}{cc}
\phantom{..}\ce{H\phantom{...}H\phantom{...}OH}\\
|\phantom{....}|\phantom{....}|\\
\ce{H - C - C - C - H}\\
|\phantom{....}|\phantom{....}|\\
\ce{H\phantom{...}H\phantom{...}H}
\end{array}\]

Give the IUPAC name of the following organic compound:

\[\begin{array}{cc}
\ce{H\phantom{...}H\phantom{...}H\phantom{...}H\phantom{...}H}\\
|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\\
\ce{H - C = C - C - C - C - H}\\
\phantom{.........}|\phantom{....}|\phantom{....}|\\
\phantom{.........}\ce{H\phantom{...}H\phantom{...}H}
\end{array}\]

Identify the reactant and write the balanced equation for the following:

Nitric acid reacts with compound Q to give a salt Ca(NO₃)₂, water and carbon dioxide.

What property of Sulphuric acid is exhibited in the following case?

In the preparation of HCI gas when it reacts with Sodium chloride.

What property of Sulphuric acid is exhibited in the following case?

When concentrated Sulphuric acid reacts with Copper to produce Sulphur dioxide gas.

The electron affinity of an element X is greater than that of element Y.

How is the oxidising power of X likely to compare with that of Y?

The electron affinity of an element X is greater than that of element Y.

How is the electronegativity of X likely to compare with that of Y?

The electron affinity of an element X is greater than that of element Y.

State whether X is likely to be placed to the left or to the right of Y in the periodic table.

You are provided with the list of chemicals mentioned below in the box:

Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:

Copper sulphate

You are provided with the list of chemicals mentioned below in the box:

Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:

Sodium zincate

You are provided with the list of chemicals mentioned below in the box:

Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:

Ferric chloride

The following question relate to the extraction of aluminium by electrolysis.
Name the other aluminium containing compound added to alumina and state the significance.

The following question relate to the extraction of aluminium by electrolysis.

Give the equation for the reaction that takes place at the cathode

Pratik heated 11.2 grams of element ‘M’ (atomic weight 56) with 4.8 grams of element 'N' (atomic weight 16) to form a compound. Find the empirical formula of the compound obtained by Pratik.

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

Give a balanced equation for the following:

Oxidation of carbon with conc. Nitric acid.

Give a balanced equation for the following:

Laboratory preparation of ethanol by using chloroethane and aqueous sodium hydroxide.

The diagram given below is a representation of the Industrial preparation of Nitric acid by Ostwald’s process. With respect to the process answer the following questions:

1. Write the temperature and the catalyst required during the catalytic oxidation of ammonia.
2. Give balanced chemical equation for the reaction occurring duringthe conversion of nitrogen dioxide to nitric acid.

Ranjana wants to prove that ammonia is a reducing agent. To demonstrate this, she passes ammonia gas over heated copper oxide. What will she observe?

Ranjana wants to prove that ammonia is a reducing agent. To demonstrate this, she passes ammonia gas over heated copper oxide.

Write a balanced chemical equation for the Black copper oxide changes to a reddish brown/pink copper reaction.

Name the alloy which is made up of Copper, Zinc and Tin.

Name an alloy of lead and tin.

1. Name the coloured gas that evolved when Abhishek heated the salt strongly.
2. Which cation was present in the sample given to Abhishek?
3. Identify the salt given to Abhishek for analysis.

Given below in column A is a schematic diagram of the electrolytic reduction of alumina. Identify the parts labelled as A, B and C with the correct options from the Column B.

column A		column B
	1.	Platinum
	2.	Anode
	3.	Cathode
	4.	Electrolyte mixture
	5.	Bauxite

Element 'X' forms an oxide with the formula X₂O₃ which is a solid with high melting point. ‘X’ would most likely be placed in the group of the Periodic Table as:

Na

Mg

Al

Si

Justify. Element 'X' forms an oxide with the formula X₂O₃ which is a solid with a high melting point. ‘X’ would most likely be placed in the group of the Periodic Table as Al.

A student was asked to perform an experiment in the laboratory based on the instructions given:

Observe picture given below and state one observation for the experiment you would notice on mixing the given solution.

A student was asked to perform an experiment in the laboratory based on the instructions given:

Observe the picture given below and state one observation for the experiment you would notice on mixing the given solution.

Copper sulphate solution is electrolysed using copper electrodes.

Which electrode [cathode or anode] is the oxidizing electrode? Why?

Copper sulphate solution is electrolysed using copper electrodes.

Write the equation for the reaction occurring at the Anode electrode.

X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:

______ is the metallic element.

X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:

Metal atoms tend to have a maximum of ______ electrons in the outermost shell.

X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:

______ is the reducing agent.

One variety of household fuel is a mixture of propane (60%) and butane (40%). If 20 litres of this mixture is burnt, find the total volume of carbon dioxide added to the atmosphere. The combination reactions can be represented as:

\[\ce{C3H8 + 5O2 -> 3CO2 + 4H2O}\]

\[\ce{2C4H10 +13O2 -> 8CO2 + 10H2O}\]

Rohit has solution X, Y and Z that has pH 2, 7 and 13 respectively.

Which solution will liberate sulphur dioxide gas when heated with sodium sulphite?

Rohit has solution X, Y and Z that has pH 2, 7 and 13 respectively.

Which solution will liberate ammonia gas when reacted with ammonium chloride?

Rohit has solution X, Y and Z that has pH 2, 7 and 13 respectively.

Which solution will not have any effect on litmus paper?

8.2 grams of calcium nitrate is decomposed by heating according to the equation

\[\ce{2Ca(NO3)2 -> 2CaO + 4NO2 + O2}\]

Calculate the following:

Volume of nitrogen dioxide obtained at STP

[Atomic weights: Ca − 40, N − 14, 0 − 16]

8.2 grams of calcium nitrate is decomposed by heating according to the equation

\[\ce{2Ca(NO3)2 -> 2CaO + 4NO2 + O2}\]

Calculate the following:

Mass of CaO formed

[Atomic weights: Ca - 40 , N - 14, 0 - 16]

State the reasons if:

Zinc and aluminium can be distinguished by heating the metal powder with a concentrated sodium hydroxide solution.

State the giving reasons if:

Calcium nitrate and lead nitrate can be distinguished by adding ammonium hydroxide solution to the salt solution.

Draw an electron dot diagram for the formation of the following. State the type of bonding present in them.

Ammonium ion

Write the equation of the following laboratory preparations:

Ethyne from calcium carbide

Give a balanced equation for the following:

Conversion of acetic acid to ethyl acetate.

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

The structures of six organic compounds are shown:

1. Identify two of the compounds that are members of the same homologous series but are not isomers.
2. Which two compounds are isomers of each other?
3. F can be prepared from D. Give a chemical equation for the reaction.