CBSE Class X – Science Chemistry Exam (Full Syllabus)

This test is designed based on NCERT Syllabus for Class 10 Topics of Science – Chemistry

Each time random 25 questions will be displaced from the question bank of 500 + Questions
So we recommend you to retake the quiz till you have mastered all the questions

1 / 25

Mention whether it is physical or chemical changes : Heating of an iron rod to red hot

physical

chemical

Both 1 & 2

none of these

2 / 25

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. Identify the brown gas X evolved.

X is nitrogen dioxide gas (NO<sub>2</sub>) that has evolved as brown, choking fumes

X is copper oxide gas that has evolved as brown, choking fumes

X is oxygen gas that has evolved as brown, choking fumes.

none of these

3 / 25

The following reaction is used for the preparation of oxygen gas in the laboratory: 2KClO₃(s) Heat ⎯ → Catalyst ⎯⎯⎯ 2KCl(s) + 3O₂(g) Which of the following statement(s) is/are correct about the reaction?

It is a decomposition reaction and endothermic in nature

It is a combination reaction

It is a decomposition reaction and accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

4 / 25

One of the following processess doesnot require a chemical reaction:

Melting of candle wax when heated

Burning of candle wax when heated

Digestion of food in your stomach

Ripening of banana

5 / 25

Which among the following is (are) double displacement reaction(s)?

Pb + CuCl₂ → PbCl₂ + Cu

Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

C + O₂ → CO₂

CH₄ + 2O₂ → CO₂ + 2H₂O

1 and 4

2

1 and 2

3 and 4

6 / 25

A visually challenged student, has to carryout a lab test to detect the presence of acid in a given solution. The acid-base indicator favoured by him will be:

Blue litmus

Clove oil

Red cabbage extract

Hibiscus extract

7 / 25

Common salt other than being used in kitchen can also be used as the raw material for making:

Washing soda

Bleaching powder

Baking soda

Slaked lime

1 and 3

1 and 2

1, 2 and 3

1, 3 and 4

8 / 25

Which of the following statements is accurate about an aqueous solution of an acid and a base?

Higher the pH, stronger the acid

Higher the pH, weaker the acid

Higher the pH, stronger the base

Lower the pH, weaker the base

1 and 3

2 and 3

2 and 4

1 and 4

9 / 25

Name the acid along present in ant sting

methanoic acid

sulphuric acid

Hydrochloric acid

none

10 / 25

The chemical used in manufacture of soaps

Na₂Co₃

NaOH

NACo₄

Na₂OH

11 / 25

Which of the following are the characteristics of isotopes of an element?

Isotopes of an element have the same atomic masses.

Isotopes of an element have the same atomic number

Isotopes of an element show the same physical properties.

Isotopes of an element show the same chemical properties.

2 and 4

1 and 3

2 and 3

1 and 4

12 / 25

What type of oxide would Eka-aluminium form?

EO₃

E₃O₂

E₂O₃

EO

13 / 25

Which one of the following does not increase while moving down in group of the periodic table?

Atomic radius

Metallic character

Valence

Number of shells in an element

14 / 25

Modern Periodic Law States that

Properties of elements are a periodic function of their atomic masses

Properties of elements are a periodic function of their atomic number

Properties of elements are a periodic function of their atomic size

Properties of elements are a periodic function of their Mass number

15 / 25

The metallic character vary across the period

It moves right to left in peroidic table

It moves left to right in peroidic table

Remains constant

none of these

16 / 25

Which of the followings is the major constituent of the liquefied petroleum gas?

Methane

Ethane

Propane

Butane

17 / 25

What is denatured alcohol?

Ethyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Methyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Alcohol having properties of an acid

Ethyl alcohol containing 60% of water by weight

18 / 25

The ability of an atom to form bonds with other atoms of the same element.

Carbonation

Catenation

Atom combination

Isomerism

19 / 25

The strong electrostatic interactions between ions formed by the transfer of electrons

covalent compounds

ionic compounds

both 1 & 2

none

20 / 25

The next homologue of C₂H₄

C₃H₆

C₄H₅

C₃H₅

C₃H₇

21 / 25

Which of the following is not a property of ionic compounds ?

They are generally solids and somewhat hard.

They have high melting and boiling points

They are soluble in solvents such as kerosene and petrol etc.

They conduct electricity in molten state

22 / 25

Metals are solid in nature. Which one of the Subsequent metals is found in liquid condition at room temperature?

Na

Fe

Cr

Hg

23 / 25

An element A is mushy and can be cut with a knife. This is very reactive to air and cannot be kept in open air. It reacts vigorously with water. Identify the element from the following:

Mg

Na

P

Ca

24 / 25

Shwetha took three beakers A, B and C containing zinc sulphate, silver sulphate and iron (II) sulphate solutions respectively. Copper pieces were added to each beaker. The solution will Become visible blue in the case of:

Beaker A

Beaker B

Beaker C

Beaker B and C

25 / 25

Which of the following Metal have very low melting points?

Gallium

titanium

uranium

copper

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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