Chemistry Official 2022-2023 (English Medium) ICSE Class 10 Question Paper Solution

An element in period 3, whose electron affinity is zero:

Sulphur

Sulphur

Neon

Argon

An element with the largest atomic radius among the following is ______.

Carbon

Nitrogen

Lithium

Beryllium

The compound that is not an ore of aluminum is ______.

Cryolite

Corundum

Fluorspar

Bauxite

The vapour density of CH₃OH is ______. (At. Wt. C = 12, H = 1, O = 16)

32

18

16

34

Which of the following reactions takes place at the anode during the electroplating of an article with silver?

\[\ce{Ag - 1e^{-} -> Ag^{1+}}\]

\[\ce{Ag + 1e^{-} -> Ag^{1-}}\]

\[\ce{Ag - 1e^{-} -> Ag}\]

None of the above

The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is ______.

Fe(OH)₂

Cu(OH)₂

Ca(OH)₂

Fe(OH)₃

An example of a cyclic organic compound is ______.

Propene

Pentene

Butene

Benzene

In the laboratory preparation, HCl gas is dried by passing through ______.

Dilute nitric acid

Concentrated sulphuric acid

Dilute sulphuric acid

Acidified water

The nitrate, which undergoes one thermal decomposition, leaves behind a residue that is yellow when hot and white when cold.

Lead nitrate

Ammonium nitrate

Copper nitrate

Zinc nitrate

The salt is formed when concentrated sulphuric acid reacts with KNO₃ above 200°C.

K₂SO₄

K₂SO₃

KHSO₄

KHSO₃

The property exhibited by concentrated sulphuric acid when it is used to prepare hydrogen chloride gas from potassium chloride is ______.

Dehydrating property

Drying property

Oxidising property

Non-volatile acid property

The hydrocarbon is formed when sodium propionate and soda lime are heated together.

Methane

Ethane

Ethene

Propane

The acid which does not form acid salt by a basic radical.

H₂CO₃

H₃PO₄

H₂SO₄

CH₃COOH

The general formula of hydrocarbons with single covalent bonds is ______.

C_nH_2n+2

C_nH_2n

C_nH_2n–2

C_nH_2n–6

The indicator that changes to pink colour in an alkaline solution is ______.

Blue Litmus

Methyl Orange

Red Litmus

Phenolphthalein

Match the Column A with Column B:

The following sketch illustrates the process of conversion of Alumina to Aluminium:

1. Name the constituent of the electrolyte mixture which has a divalent metal in it.
2. Name the powdered substances ‘X’ sprinkled on the surface of the electrolyte mixture.
3. What is the name of the process?
4. Write the reactions taking place at the electrodes ‘Y’ (anode) and ‘Z’ (cathode), respectively.

Metals are good ______.

Oxidising agents

Reducing agents

Non-polar covalent compounds are ______ conductors of heat and electricity.

Good

Bad

Higher the pH value of a solution, the more ______ it is.

Acidic

Alkaline

______ is a white precipitate that is soluble in excess of Ammonium hydroxide solution.

Silver chloride

Lead chloride

Conversion of ethene to ethane is an example of ______.

Hydration

Hydrogenation

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.

Give one word/a phase/term/process for the following statement:

The tendency of an element to form chains of identical atoms.

State the terms/process for the following:

The name of the process by which Ammonia is manufactured on a large scale.

State the terms/process for the following:

A type of salt formed by partial replacement of hydroxyl radicals with an acid radical.

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 the structural formula of the following organic compound:

2-chlorobutane

Give the structural formula of the following organic compound:

Methanal

Give the structural formula of the following organic compound:

But-2-yne

Give the IUPAC name of the following organic compound:

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

Give the IUPAC name of the following organic compound:

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

Identify the cation in the following case:

Ammonium hydroxide solution when added to Solution B gives a white precipitate which does not dissolve in excess of ammonium hydroxide solution.

Identify the cation in the following case:

Sodium hydroxide solution when added to Solution C gives a white precipitate which is insoluble in excess of sodium hydroxide solution.

During electrolysis, the compound ______ in its molten state, liberates reddish brown fumes at the anode.

NaCl

PbBr₂

The ion which could be discharged most readily during electrolysis is ______.

Fe²⁺

Cu²⁺

Arrange the following as per the instruction given in the bracket:

Al, K, Mg, Ca (decreasing order of its reactivity)

Arrange the following as per the instruction given in the bracket:

N, Be, O, C (increasing order of non-metallic character)

Arrange the following as per the instruction given in the bracket:

P, Si, F, Be (decreasing order of valence electrons)

Complete and balance the following equation:

\[\ce{NH4Cl + Ca(OH)2 ->}\]

Complete and balance the following equation:

\[\ce{CuSO4 + NH3OH ->}\]

Complete and balance the following equation:

\[\ce{Cu + Conc{.} HNO3 ->}\]

State a relevant reason for the following:

Hydrogen chloride gas cannot be dried over quick lime.

State a relevant reason for the following:

Ammonia gas is not collected over water.

Name the alloys for the given composition:

Magnesium + Manganese + Aluminium + Copper

Identify the alloy in the given composition.

iron, nickel, chromium, carbon

Solve the following numerical problem:

Ethane burns in oxygen according to the chemical equation:

\[\ce{2C2H6 + 7O2 -> 4CO2 + 6H2O}\]

If 80 ml of ethane is burned in 300 ml of oxygen, find the composition of the resultant gaseous mixture when measured at room temperature.

The following question pertains to the laboratory preparation of Ammonia gas from Magnesium nitride:

Write a balanced chemical equation for its preparation.

The following question pertains to the laboratory preparation of Ammonia gas from Magnesium nitride:

Why is the method seldom used?

The following question pertains to the laboratory preparation of Ammonia gas from Magnesium nitride:

How do you identify the gas that formed?

Write one use of the following alloy:

Bronze

Write one use of the following alloy:

Fuse metal

Draw the electron dot structure for the following:

Ammonium ion

[At. No. : N = 7, H = 1]

Draw the electron dot structure for the following:

A molecular nitrogen

[At. No. : N = 7, H = 1]

Write balanced equations to show the preparation of the following:

Ethene from ethanol

Write balanced equations to show the preparation of the following:

Ethyne from Calcium carbide

Give a balanced chemical equation for the following conversion with condition:

Monochloromethane from methane

Study the following observation and name the anion present in the reaction:

When a crystalline solid 'P' is warmed with concentrated H₂SO₄ and copper turnings a reddish brown gas is released.

Study the following observation and name the anion present in the reaction:

When few drops of dilute sulphuric acid is added to Salt 'R' and heated, a colourless gas is released which turns moist lead acetate paper silvery black.

Study the following observation and name the anion present in the reaction:

When few drops of barium nitrate solution is added to the salt solution 'Q', a white precipitate is formed which is insoluble in HCl.

Define the term Electronegativity.

State Gay-Lussac's law of combining volumes.

The Empirical formula of an organic compound is CHCl₂.

If its relative molecular mass is 168, what is its molecular formula?

[At. Wt. C = 12, H = 1, Cl = 35.5]

The metal that will not produce hydrogen gas when reacted with dilute acids.

Iron

Lead

Magnesium sulphite

Ferric chloride

Zinc 

Copper

Sodium sulphide

Ferrous sulphate

The compound that will produce sulphur dioxide gas when reacted with dilute HCl.

Iron

Lead

Magnesium sulphite

Ferric chloride

Zinc

Copper

Sodium sulphide

Ferrous sulphate

The solution of this compound produces dirty green precipitate with NaOH.

Iron

Lead

Magnesium sulphite

Ferric chloride

Zinc

Copper

Sodium sulphide

Ferrous sulphate

State one relevant observation for the following:

To the copper nitrate solution, initially, few drops of sodium hydroxide solution is added and then added in excess.

State one relevant observation for the following:

Burning of ammonia in excess of oxygen.

State one relevant observation for the following:

Dry ammonia gas is passed over heated PbO.

Name the following:

Organic compounds with same molecular formula but different structural formula.

Name the following:

Group of organic compounds where the successive members follow a regular structural pattern, successive compounds differ by a 'CH₂' group.

Give reason for the following:

Ionisation potential decreases down a group.

Give reason for the following:

Ionic compounds do not conduct electricity in solid state.

Find the percentage of phosphorus in the fertilizer superphosphate Ca(H₂PO₄)₂.

Calculate:

Write the empirical formula of C₈H₁₈.

Answer the following question with reference to the electrorefining of copper:

What is the anode made of?

Answer the following question with reference to the electrorefining of copper:

What do you observe at the cathode?

Answer the following questions with reference to the electrorefining of copper:

Write the reaction taking place at the cathode.

Arrange the following according to the instruction given in bracket:

C₂H₂, C₃H₆, CH₄, C₂H₄ (In the increasing order of the molecular weight)

Arrange the following according to the instruction given in bracket:

Cu²⁺, Na⁺, Zn²⁺, Ag⁺ (The order of Preferential discharge at the cathode)

Differentiate between the following pair based on the criteria given in the bracket:

Cane sugar and hydrated copper sulphate [using concentrated H₂SO₄]

Differentiate between the following pair based on the criteria given in the bracket:

Sulphuric acid and hydrochloric acid [type of salts formed]

Convert the following reaction into a balanced chemical equation:

Ammonia to nitric oxide using oxygen and platinum catalyst.

Convert the following reaction into a balanced chemical equation:

Sodium hydroxide to sodium sulphate using sulphuric acid.

Convert the following reaction into a balanced chemical equation:

Ferrous sulphide to hydrogen sulphide using hydrochloric acid.

A compound which undergoes thermal dissociation.

CCl₄

PbO

NaCl

CuO

NH₄Cl

An amphoteric oxide.

CCl₄

PbO

NaCl

CuO

NH₄Cl

A compound which is a non-electrolyte.

CCl₄

PbO

NaCl

CuO

NH₄Cl