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

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Why does the colour of the solution fades?

due to its reaction with hydrogen sulphide gas and results into the formation of colourless solution of sulphuric acid.

due to its reaction with Copper sulphate gas and results into the formation of colourless solution of sulphuric acid.

Both 1 & 2

all of these

2 / 25

State the reactions are exothermic or endothermic in nature: Decomposition of ferrous sulphate

endothermic reaction

exothermic reaction

Both 1 & 2

all of these

3 / 25

When copper turning are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because copper ?

Displaces silver from the solution

Forms a blue colored complex with AgNO₃

Is oxidized to Cu₂₊

Is reduced to Cu₂₊

4 / 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

5 / 25

Which of the following are combination reactions?

KClO₃ →^(Heat)→ 2KCl + 3O₂

MgO + H₂O → Mg(OH)₂

4Al + 3O₂ → 2Al2O₃

Zn + FeSO₄ →ZnSO₄ + Fe

1 and 4

3 and 4

2 and 4

2 and 3

6 / 25

If 10 mL of H₂SO₄ is mixed with 10 mL of Mg(OH)₂ of the same concentration, the resultant solution will give the following colour with universal indicator:

Red

Yellow

Green

Blue

7 / 25

The chemical formula for plaster of Paris is :

CaSO₄.2H₂O

CaSO₄.H₂O

CaSO₄. 1/2H₂O

2CaSO₄.H₂O

8 / 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

9 / 25

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

The higher the pH, the stronger the acid

The higher the pH, the weaker the acid

The lower the pH, the stronger the base

The lower the pH, the weaker the base

2 and 4

1 and 3

2 and 3

1 and 4

10 / 25

On strong heating, blue coloured copper sulphate crystals turns

purple

red

white

blue

11 / 25

An element X is forming acidic oxide. Its most expected position in the modern periodic table is:

Group 1 and Period 3

Group 16 and Period 3

Group 17 and Period 3

Group 2 and Period 3

12 / 25

An element which is a crucial constituent of all organic compounds belongs to:

Group 1

Group 14

Group 15

Group 16

13 / 25

Which of the following elements would lose an electron with ease?

Mg

Na

K

Ca

14 / 25

The atomic number of an element is 20, its electronic configuration.

2, 8, 4, 2,

2, 8, 8, 2,

4, 8, 8, 2,

8, 8, 2,2

15 / 25

Is calcium?

metal

non metal

both

none of these

16 / 25

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

Methane

Ethane

Propane

Butane

17 / 25

The organic compounds having functional group are known as:

Aldehyde

Ketone

Carboxylic acids

Alcohol

18 / 25

The formula of cyclopentane

C6H10

C4H10

C5H10

C3H10

19 / 25

The compounds have low melting and boiling points.

covalent compounds

ionic compounds

molecular compounds

both 1 & 2

20 / 25

Chemical name of the compound CH₃—CH₂—CH₂—Br

1-Bromo Propane

2-Bromo Propane

3-Bromo Propane

4-Bromo Propane

21 / 25

Non-metals are not lustrous. Which of the following non-metals is lustrous?

Sulphur

Oxygen

Nitrogen

Iodine

22 / 25

The Lustrous non-metal

mercury

iodine

iron

almunium

23 / 25

A Metal that exists in liquid state at room temperature

gold

mercury

sodium

silver

24 / 25

The Most malleable and ductile metal

mercury

sodium

gold

silver

25 / 25

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: K and O₂

K₃O

K₂O

K₄O

None of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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