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

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

To prevent oxidation

to increase oxidation

to prevent reduction

all of these

3 / 25

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

CO

Fe

CO₂

Fe₂O

4 / 25

In the electrolysis of water, name the gases liberated at anode

H<sub>2</sub>O

Oxygen

Hydrogen

None of these

5 / 25

One of the following does not happen during a chemical reaction.

Breaking of old chemical bonds and formation of new chemical bonds

Formation of new substances with entirely diferent properties

Atoms of one element change into those of another element to form new products

A rearrangement of atoms takes place to form new products

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

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Wash the hand with a saline solution

Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

After washing with plenty of water, apply a solution of sodium hydroxide on the hand

Neutralise the acid with a strong alkali

8 / 25

Which of the following solutions in water does not conduct electricity?

Hydrochloric acid

Sodium chloride

Glucose

Sulphuric acid

9 / 25

On strong heating, blue coloured copper sulphate crystals turns

purple

red

white

blue

10 / 25

The other name of methanoic acid is

Formic acid

sulpuric acid

Hydrochloric acid

none

11 / 25

In Mendeleev’s periodic table, gaps were left for the elements to be discovered later. Which of the subsequent element found a place in the periodic table later?

Germanium

Chlorine

Oxygen

Silicon

12 / 25

Which of the following gives the accurate increasing order of the atomic radii of O, F and N?

O, F, N

N, F, O

O, N, F

F, O, N

13 / 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

14 / 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

15 / 25

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

l < Br < Cl < At

At < Br < I < Cl

Cl < I < Br < At

Cl < Br < I < At

16 / 25

From which of the following substance pencil lead is formed?

Charcoal

Wood

Lead

Graphite

17 / 25

The property of self-linkage among identical atoms to form long chain compounds is known as:

Catenation

Isomerisation

Superposition

Halogenation

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 Ethanol

C₂H₆OH

C₂H₇OH

C₂H₅OH

C₂HOOH

21 / 25

Which among the following Declaration is incorrect for magnesium metal?

It burns in oxygen with a dazzling white fame

It reacts with cold water to form magnesium oxide and evolves hydrogen gas.

It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.

It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

22 / 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

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

What occurs when calcium is treated with water?

It does not react with water.

It reacts violently with water. I

t reacts less violently with water.

Bubbles of hydrogen gas formed stick to the surface of calcium.

3 and 4

1 and 3

2 and 3

1 and 4

25 / 25

Give the formula of the stable binary compounds that would be formed by the combination of following pair of elements: Al and Cl₂

AlCl₄

AlCl₂

AlCI₃

None of these

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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