Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

CH

CHO

C H2 O

2 / 50

The ratio of carbon and oxygen in CO₂ ________

2:3

1:8

3:8

1:2

3 / 50

How many molecules of water will be present in half mole of water?

6.02x10(23)

6.02x10(24)

1.66x10(-24)

3.01x10(23)

4 / 50

Fourth state of matter is__________

Plasma

Solid

Liquid

Gas

5 / 50

In which one of the following pairs has the same number of ions?

1/2 mole of NaCl and 1/3 mole of MgCl2

1/3 mole of NaCl and 1/2 mole of MgCl2

1/2 mole of NaCl and 1/2 mole of MgCl2

1 mole of NaCl and 1 mole of MgCl2

6 / 50

One amu (atomic mass unit) is equivalent to_______

1.66.x10(-24)g

1.66 x 10(-23)g

1.66 x 10(-24)kg

1.66 x 10(-24) mg

7 / 50

Which of the followings are tri-atomic molecule except?

O3

H2

CO2

H2O

8 / 50

The mass of one molecule of water is________

18mg

18kg

18g

18amu

9 / 50

Which one is polyatomic molecule?

C H4

H2 SO4

All of these

C6 H2 O6

10 / 50

How many number of moles are equivalent to 8 grams of CO₂?

0.21

0.24

0.18

0.15

11 / 50

Which one of following is an example of ionic compound?

CH4

H2O

HCl

NaCl

12 / 50

Nuclear Chemistry has application in__________

Medical Treatment

Metallurgy

Ecology

Agriculture

13 / 50

1-gram atom of carbon contains how many moles is_________

6 moles

1mole

2mole

12mole

14 / 50

Elements may be_________

Solid

All of these

Liquid

Gas

15 / 50

Valency of oxygen is___________

5

2

4

3

16 / 50

Mixture can be separated by method_________

Physical

Nuclear

All of these

Chemical

17 / 50

Which one of the following is molar mass of O₂ in amu?

53.12x10(-24)amu

192.64X10(-25)amu

1.92x10(-25)amu

32amu

18 / 50

Which one of the following elements is found in most abundance in the earth's crust?

Aluminum

Iron

Silicon

Oxygen

19 / 50

Which one is extremely reactive species?

CH3

Na

N2+

H2

20 / 50

How many atoms are present in one-gram atomic mass of a substance?

None of these

6.02x10(24)

1.66x10(-23)

6.02x10(23)

21 / 50

Example of covalent compound is _________

HCl

KNO3

KCl

NaCl

22 / 50

Empirical formula of glucose is______

C2 HO

CHO2

C H2 O

CHO

23 / 50

Formula mass of K₂SO₄ is___________

145amu

174amu

110amu

180amu

24 / 50

Which one of the following pairs has the same mass?

1 mole of O2 and 1 mole of N2

1 mole of CO and 1 mole of N2

1 mole of CO and 1 mole of CO2

1 mole of O2 and 1 mole of CO2

25 / 50

Mass of 3 moles of oxygen atoms is ___________

64g

16g

48g

32g

26 / 50

Example of mono atomic molecule is___________

O2

H2

CO2

He

27 / 50

Formation of which of the following is affected by light_________

Free Radical

Ion

Molecule

Atom

28 / 50

The molar mass of H₂S0₄ is__________

9.8g

9.8amu

98g

98amu

29 / 50

Which type of molecular ions are present in plasma?

Neutral

Both a & b

Anionic

Cationic

30 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on commercial scale

on micro scale

on economic scale

in the laboratory

31 / 50

Which one is a physical property?

Hardness

Smell

Taste

All of these

32 / 50

Which compound has same molecular and empirical formula?

C6 H6

C6 H12 O6

H2 O

H2 O2

33 / 50

Atom is electrically______

None

Negative

Positive

Neutral

34 / 50

Value of Avogadro number is________

6.02x10(23)

6.00x10(24)

6.6x10(-20)

1.32x10(23)

35 / 50

A piece of matter in pure form is termed as _________

Element

Substance

Mixture

Matter

36 / 50

Which one of the following can be separated by physical-means?

Compound

Mixture

Radical

Element

37 / 50

Structure of atom is studied in which branch of chemistry?

Nuclear

Organic

Physical

Inorganic

38 / 50

How many atoms are present in one-gram atomic mass of a substance?

6.02 x 10(23)

6.2 x 10(-23)

12.04 x 10(23)

6.20 x 10(24)

39 / 50

1-gram formula of NaCl contains grams________

58.5g

49g

100g

32g

40 / 50

The third abundant gas found in the earth's crust is_______

Argon

Nitrogen

Carbon monoxide

Oxygen

41 / 50

Brass is a mixture of___________

Al & Fe

Cu & Zn

Cu & Sn

Cu & Al

42 / 50

40g of H₃PO₄ contains number of moles__________

0.58g

4.8g

5.8g

0.408g

43 / 50

80 percent elements are____________

Metals

Non-metals

None

Metalloids

44 / 50

Valency of carbon is___________

2

1

3

4

45 / 50

Empirical formula of sand is________

SiO4

SiO2

SiO3

Si2O3

46 / 50

The most abundant element occurring in the oceans is_______

Oxygen

Nitrogen

Silicon

Hydrogen

47 / 50

Example of heterogeneous mixture is ___________

gasoline

ice cream

Air

Soil

48 / 50

The valency of Noble Gases is__________

Two

Zero

Three

One

49 / 50

Percentage of Argon in nature is____________

47%

87%

0.9%

21%

50 / 50

Number of protons in the nucleus of an atom is called ________

Atomic No

Mass Unit

Mass No

Electron No

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Chemistry Notes, Problems for Class 9th

Chemistry, a new subject for 9th Class, having a lot of concepts, starting from a single definition of the smallest particle of our universe which is called ‘atom’. In the 8th grade usually, we have to study only one book of science that combines chemistry, physics, and biology. But as, we got into 9th class and with every passing day things starts to get more complex now. similarly we got three books instead of just one science book, chemistry class 9 chapter 1.

And, if you any student of 9th Class feeling difficult to understand the concept of chemistry. Then, these chemistry notes for class 9 are enough. by Understanding chemistry Notes for 9th class means remembering a lot of concepts. Consider that particular subject important in which you want to study for your whole life. And, read more than just the textbook about that particular subject. If you think you want to study chemistry for your whole life that’s great, our country also need chemists.

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Chapter wise PDF Notes / Problems / Solution of Chemistry 9th Class

                     Chapter-01 – Fundamentals of Chemistry

                     Chapter-02 – Structure of Atoms 

                     Chapter-03 – Periodic Table and Periodicity of Properties

                     Chapter-04 – Structure of Molecules 

                     Chapter-05 – Physical States of Matter 

                     Chapter-06 – Solutions 

                     Chapter-07 – Electrochemistry 

                     Chapter-08 – Chemical Reactivity 

                     Pairing Scheme for 2021 – Chemistry 9th Class