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.Write the chemical name of the black precipitate formed.

hydrogen sulphide

copper sulphide.

hydrogen sulphate

none of these

2 / 25

Which of the following is not a physical change?

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefed Petroleum Gas

3 / 25

Which of the following gases can be used for the storage of fresh sample of an oil for a long duration?

Carbon dioxide or oxygen

Nitrogen or oxygen

Carbon dioxide or helium

Helium or nitrogen

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

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

6 / 25

Which of the consequent will turn phenolphthalein pink?

NaOH(aq)

HCl(aq)

CH₃COOH(aq)

H₂O

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 subsequent phenomena occur, when a slight amount of acid is added to water?

It turns lime water milky

It extinguishes a burning splinter.

It dissolves in a solution of sodium hydroxide.

It has a pungent odour

1 and 3

1 and 2

2 and 3

2 and 4

9 / 25

The source of citric acid is

lemon

vinegar

orange

none

10 / 25

On strong heating, blue coloured copper sulphate crystals turns

purple

red

white

blue

11 / 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

12 / 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

13 / 25

Arrange these elements in increasing order of their atomic radii

Carbon Nitrogen Oxygen Fluorine

Fluroine oxygen Nitrogen Oxygen

Nitrogen Oxygen Carbon Fluroine

Oxygen Nitrogen Fluroine Carbon

14 / 25

Why does atomic radius decreases as we move from left to right in a period

due to increase in nuclear charge which tends to pull the electrons closer to the nucleus.

due to decrease in nuclear charge which tends to pull the electrons closer to the nucleus.

due to no change in nuclear charge which tends to pull the electrons closer to the nucleus.

none of these

15 / 25

How many metals are present in second period of periodic table?

10

6

8

2

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

How many number of carbon atoms are joined in a spherical molecule of buckminsterfullerene?

30

60

90

120

18 / 25

Which of the following statements about graphite and diamond is true?

They have the same crystal structure

They have the same degree of hardness

They have the same electrical conductivity

They can undergo the same chemical reactions

19 / 25

Molecular formula of Methane

CH₆

CH₄

CH₅

CH₃

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

Which one of the following four metals would be replaced from the solution of its salts by the other three metals?

Mg

Ag

Zn

Cu

24 / 25

The poorest conductor of heat among metals is

Lead

Mercury

Calcium

Sodium

25 / 25

Name one non-metal that exist in liquid state at room temperature.

bromine

mercury

Ballium

gold

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CBSE Class X – Science Chemistry Exam (Full Syllabus)

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