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

Argon

Nitrogen

Oxygen

2 / 50

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

53.12x10(-24)amu

32amu

1.92x10(-25)amu

192.64X10(-25)amu

3 / 50

Empirical formula of glucose is______

CHO

CHO2

C2 HO

C H2 O

4 / 50

Valency of carbon is___________

1

3

2

4

5 / 50

Empirical formula of sand is________

SiO3

SiO4

SiO2

Si2O3

6 / 50

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

0.18

0.15

0.24

0.21

7 / 50

1-gram formula of NaCl contains grams________

49g

32g

100g

58.5g

8 / 50

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

1.66x10(-24)

6.02x10(24)

6.02x10(23)

3.01x10(23)

9 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

1:8

2:3

3:8

10 / 50

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

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

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

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

1 mole of NaCl and 1 mole of MgCl2

11 / 50

Which of the followings are tri-atomic molecule except?

H2O

H2

CO2

O3

12 / 50

Which compound has same molecular and empirical formula?

C6 H6

H2 O2

H2 O

C6 H12 O6

13 / 50

Brass is a mixture of___________

Cu & Sn

Al & Fe

Cu & Zn

Cu & Al

14 / 50

Elements may be_________

All of these

Liquid

Solid

Gas

15 / 50

Valency of oxygen is___________

2

5

4

3

16 / 50

The molar mass of H₂S0₄ is__________

98g

9.8amu

98amu

9.8g

17 / 50

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

Mixture

Element

Radical

Compound

18 / 50

Which type of molecular ions are present in plasma?

Neutral

Anionic

Both a & b

Cationic

19 / 50

80 percent elements are____________

Metalloids

None

Metals

Non-metals

20 / 50

Which one is polyatomic molecule?

C H4

C6 H2 O6

H2 SO4

All of these

21 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Organic

Nuclear

Inorganic

22 / 50

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

6.2 x 10(-23)

12.04 x 10(23)

6.20 x 10(24)

6.02 x 10(23)

23 / 50

Example of covalent compound is _________

KNO3

HCl

NaCl

KCl

24 / 50

Which one of following is an example of ionic compound?

CH4

HCl

NaCl

H2O

25 / 50

Value of Avogadro number is________

1.32x10(23)

6.00x10(24)

6.02x10(23)

6.6x10(-20)

26 / 50

Which one is extremely reactive species?

Na

H2

CH3

N2+

27 / 50

The mass of one molecule of water is________

18kg

18amu

18g

18mg

28 / 50

Mass of 3 moles of oxygen atoms is ___________

64g

48g

16g

32g

29 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

CHO

C H2 O

None of these

CH

30 / 50

The valency of Noble Gases is__________

Zero

Two

One

Three

31 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on economic scale

on micro scale

on commercial scale

in the laboratory

32 / 50

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of CO2

1 mole of CO and 1 mole of CO2

1 mole of O2 and 1 mole of N2

33 / 50

A piece of matter in pure form is termed as _________

Substance

Element

Mixture

Matter

34 / 50

1-gram atom of carbon contains how many moles is_________

2mole

6 moles

1mole

12mole

35 / 50

Formula mass of K₂SO₄ is___________

180amu

110amu

145amu

174amu

36 / 50

Example of mono atomic molecule is___________

O2

CO2

He

H2

37 / 50

Fourth state of matter is__________

Plasma

Liquid

Solid

Gas

38 / 50

40g of H₃PO₄ contains number of moles__________

0.408g

4.8g

5.8g

0.58g

39 / 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

40 / 50

Which one is a physical property?

Smell

All of these

Hardness

Taste

41 / 50

Mixture can be separated by method_________

All of these

Chemical

Physical

Nuclear

42 / 50

Formation of which of the following is affected by light_________

Molecule

Ion

Atom

Free Radical

43 / 50

The most abundant element occurring in the oceans is_______

Nitrogen

Oxygen

Silicon

Hydrogen

44 / 50

Percentage of Argon in nature is____________

0.9%

21%

47%

87%

45 / 50

Example of heterogeneous mixture is ___________

Soil

gasoline

Air

ice cream

46 / 50

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

Mass Unit

Atomic No

Mass No

Electron No

47 / 50

Atom is electrically______

None

Neutral

Positive

Negative

48 / 50

Nuclear Chemistry has application in__________

Metallurgy

Agriculture

Medical Treatment

Ecology

49 / 50

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

6.02x10(24)

None of these

6.02x10(23)

1.66x10(-23)

50 / 50

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

Iron

Aluminum

Silicon

Oxygen

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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