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

Give an example of decomposition reaction taking place in our body.

reproduction

digestion

blood circulation

respiration

2 / 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

3 / 25

Mention whether it is physical or chemical changes: Sublimation of solid ammonium chloride

physical

chemical

Both 1 & 2

none of these

4 / 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₊

5 / 25

which of the subsequent chemical equations do the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

2H₂(l) + O₂(l) → 2H₂O(g)

2H₂(g) + O₂(l) → 2H₂O(g)

2H₂(g) + O₂(g) → 2H₂O(l)

2H₂(g) + O₂(g) → 2H₂O(g)

6 / 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

7 / 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

8 / 25

The chemical formula for methonic acid

H2COH

HOOCH

HCOOH

None

9 / 25

Antacid are

Acidic in nature

Basic in nature

both

none

10 / 25

What types of ions are formed when a base is dissolved in water ?

H+ ions are formed

OH- ions

allof these

11 / 25

Organise the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al:

Cl > Si > Al > Mg > Na

Na > Mg > Al > Si > Cl

Na > Al > Mg > Cl > Si> Ca > Mg

Al > Na > Si

12 / 25

Which of the subsequent elements will form an acidic oxide?

An element with atomic number 7

An element with atomic number 3

An element with atomic number 12

An element with atomic number 19

13 / 25

Which of the subsequent set of elements is written in sequence of their increasing metallic character?

Be, Mg, Ca

Na, Li, K

Mg, Al, Si

C, O, N

14 / 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

15 / 25

Arrange the following elements in increasing order of their atomic radii:

F < N < Be < Li.

F < N < Li < Be.

Li < F < Be < N.

16 / 25

Ester is formed by the reaction between:

An acid and an alcohol

An acid and a base

A base and an alcohol

An acid and an alkene

17 / 25

Cation is formed when:

Atom gains electrons

Atom loses electrons

Proton is lost by the atom

Atom shares electrons

18 / 25

Ethane is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

19 / 25

Ethene is

saturated hydrocarbon

unsaturated hydrocarbon

both 1 & 2

none

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

Which of the subsequent quality is generally not shown by metals?

Electrical conduction

Sonorous in nature

Dullness

Ductility

22 / 25

Which one of the following properties is not commonly exhibited by ionic compounds?

Solubility in water

Electrical conductivity in solid state

High melting and boiling points

Electrical conductivity in molten state

23 / 25

Electrical wires have a coating of an insulating material. The material, overall adopted is:

Sulphur

Graphite

PVC

All can be used

24 / 25

In the given reaction, Al₂O₃ + NaOH → …X… + H₂O. What is element X?

NaAlO2

Na3Al

Na2O3

NaAl2O3

25 / 25

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire.

Due to high exothermic hydrogen evolved immediately catches fre

Due to low exothermic hydrogen evolved immediately catches fre

Due to high endothermic hydrogen evolved immediately catches fre

Due to low endothermic hydrogen evolved immediately catches fre

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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