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

Why are anti-oxidants added to fat and oil containing food items?

To prevent oxidation

to increase oxidation

to prevent reduction

all of these

2 / 25

Identify the reducing agent in the following reactions: Fe₂O₃ + 3CO → 2Fe + 3CO₂

CO

Fe

CO₂

Fe₂O

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

Calcium phosphate is present in tooth enamel. Its nature is:

Basic

Acidic

Neutral

Amphoteric

7 / 25

To preserve tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

Acidic

Neutral

Basic

Corrosive

8 / 25

Which of the following substances will not give carbon dioxide on treatment with dilute acid?

Marble

Limestone

Baking soda

Lime

9 / 25

What types of ions are formed when an acid is dissolved in water ?

H+ ions are formed

H<sub>2</sub>0 +

OH- ions

None

10 / 25

On strong heating, blue coloured copper sulphate crystals turns

purple

red

white

blue

11 / 25

Which of the following declaration about the modern periodic table is accurate?

It has 18 horizontal rows known as periods.

It has 7 vertical columns rows known as periods

It has 18 vertical columns known as groups.

It has 7 horizontal rows known as groups.

12 / 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

13 / 25

Arrange the following elements in sequence of their increasing non-metallic character Li, O, C, Be and F.

F < O < C < Be < Li

Li < Be < C < O < F

F < O < C < Be < Li

F < O < Be < C < Li

14 / 25

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

F < N < Be < Li.

F < N < Li < Be.

Li < F < Be < N.

15 / 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

16 / 25

The I.U.P.A.C name of CH₃CH₂CH=CH₂ is?

3-Butene

Prop-1-ene

But-1-ene

Butyne

17 / 25

Cation is formed when:

Atom gains electrons

Atom loses electrons

Proton is lost by the atom

Atom shares electrons

18 / 25

The compounds formed by the sharing of electron pairs between two atoms.

covalent compounds

ionic compounds

both 1 & 2

none

19 / 25

Saturated hydrocarbons contains

double covalent bonds

three covalent bonds

four covalent bonds

single covalent bonds

20 / 25

The molecular formula of the fourth member of alkane series.

C₅H₁₀

C₄H₁₀

C₆H₁₀

C₇H₁₀

21 / 25

An aluminium strip is retained immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change state is that:

Green solution slowly turns brown

Lower end of test tube becomes slightly warm

A colourless gas with the smell of burning sulphur is observed

Light green solution changes to blue

22 / 25

Which of the consecutive are not ionic compounds?

KCl

HCl

CCl₄

NaCl

2 and 3

1 and 2

1 and 3

3 and 4

23 / 25

Which metal can be displaced by copper from its salt solution?

Silver & zinc

Silver & mercury

Iron & silver

Iron & mercury

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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