Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

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

Carbon monoxide

Nitrogen

Argon

Oxygen

2 / 50

Which of the followings are tri-atomic molecule except?

O3

H2O

CO2

H2

3 / 50

Example of covalent compound is _________

NaCl

KNO3

KCl

HCl

4 / 50

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

Aluminum

Iron

Silicon

Oxygen

5 / 50

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

6.02x10(23)

1.66x10(-23)

None of these

6.02x10(24)

6 / 50

1-gram formula of NaCl contains grams________

49g

32g

100g

58.5g

7 / 50

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

1.92x10(-25)amu

53.12x10(-24)amu

192.64X10(-25)amu

32amu

8 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

C H2 O

CHO

CH

9 / 50

Atom is electrically______

Positive

None

Negative

Neutral

10 / 50

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

1.66x10(-24)

3.01x10(23)

6.02x10(24)

6.02x10(23)

11 / 50

Percentage of Argon in nature is____________

47%

21%

87%

0.9%

12 / 50

Brass is a mixture of___________

Cu & Sn

Cu & Zn

Cu & Al

Al & Fe

13 / 50

Formula mass of K₂SO₄ is___________

110amu

174amu

180amu

145amu

14 / 50

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

0.15

0.24

0.21

0.18

15 / 50

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

Radical

Element

Compound

Mixture

16 / 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

17 / 50

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of CO2

1 mole of O2 and 1 mole of CO2

1 mole of O2 and 1 mole of N2

1 mole of CO and 1 mole of N2

18 / 50

Which one of following is an example of ionic compound?

NaCl

CH4

H2O

HCl

19 / 50

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

Atomic No

Electron No

Mass Unit

Mass No

20 / 50

Empirical formula of sand is________

SiO4

SiO3

Si2O3

SiO2

21 / 50

80 percent elements are____________

None

Metalloids

Metals

Non-metals

22 / 50

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

6.2 x 10(-23)

6.02 x 10(23)

12.04 x 10(23)

6.20 x 10(24)

23 / 50

Mass of 3 moles of oxygen atoms is ___________

16g

64g

32g

48g

24 / 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 mole of NaCl and 1 mole of MgCl2

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

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

25 / 50

Elements may be_________

Liquid

Solid

Gas

All of these

26 / 50

Formation of which of the following is affected by light_________

Ion

Free Radical

Atom

Molecule

27 / 50

Which compound has same molecular and empirical formula?

H2 O2

H2 O

C6 H6

C6 H12 O6

28 / 50

Mixture can be separated by method_________

All of these

Nuclear

Chemical

Physical

29 / 50

Fourth state of matter is__________

Liquid

Gas

Plasma

Solid

30 / 50

The molar mass of H₂S0₄ is__________

9.8amu

98g

9.8g

98amu

31 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Inorganic

Nuclear

Organic

32 / 50

Example of heterogeneous mixture is ___________

ice cream

gasoline

Air

Soil

33 / 50

Value of Avogadro number is________

1.32x10(23)

6.02x10(23)

6.00x10(24)

6.6x10(-20)

34 / 50

The most abundant element occurring in the oceans is_______

Silicon

Hydrogen

Nitrogen

Oxygen

35 / 50

1-gram atom of carbon contains how many moles is_________

6 moles

2mole

12mole

1mole

36 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

3:8

1:8

2:3

37 / 50

Which one is polyatomic molecule?

C H4

H2 SO4

C6 H2 O6

All of these

38 / 50

Which type of molecular ions are present in plasma?

Anionic

Cationic

Neutral

Both a & b

39 / 50

Which one is extremely reactive species?

N2+

H2

CH3

Na

40 / 50

Nuclear Chemistry has application in__________

Ecology

Medical Treatment

Agriculture

Metallurgy

41 / 50

Which one is a physical property?

Hardness

Smell

All of these

Taste

42 / 50

Empirical formula of glucose is______

CHO

C2 HO

CHO2

C H2 O

43 / 50

Valency of oxygen is___________

5

4

2

3

44 / 50

The mass of one molecule of water is________

18kg

18g

18amu

18mg

45 / 50

The valency of Noble Gases is__________

Zero

Three

One

Two

46 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on economic scale

on micro scale

in the laboratory

on commercial scale

47 / 50

Example of mono atomic molecule is___________

He

H2

O2

CO2

48 / 50

40g of H₃PO₄ contains number of moles__________

5.8g

0.58g

4.8g

0.408g

49 / 50

Valency of carbon is___________

3

4

2

1

50 / 50

A piece of matter in pure form is termed as _________

Element

Matter

Mixture

Substance

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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