Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

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

6.02x10(24)

1.66x10(-23)

6.02x10(23)

None of these

2 / 50

Which type of molecular ions are present in plasma?

Both a & b

Neutral

Anionic

Cationic

3 / 50

The valency of Noble Gases is__________

One

Three

Zero

Two

4 / 50

Example of mono atomic molecule is___________

He

H2

CO2

O2

5 / 50

Value of Avogadro number is________

6.00x10(24)

1.32x10(23)

6.02x10(23)

6.6x10(-20)

6 / 50

Fourth state of matter is__________

Solid

Liquid

Gas

Plasma

7 / 50

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

Electron No

Mass Unit

Atomic No

Mass No

8 / 50

40g of H₃PO₄ contains number of moles__________

0.58g

5.8g

0.408g

4.8g

9 / 50

Percentage of Argon in nature is____________

21%

87%

0.9%

47%

10 / 50

Which compound has same molecular and empirical formula?

H2 O

C6 H6

H2 O2

C6 H12 O6

11 / 50

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

1 mole of NaCl and 1 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

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

12 / 50

Empirical formula of glucose is______

C2 HO

CHO

C H2 O

CHO2

13 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on commercial scale

on economic scale

on micro scale

in the laboratory

14 / 50

Elements may be_________

Gas

Solid

All of these

Liquid

15 / 50

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

0.15

0.21

0.24

0.18

16 / 50

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

Aluminum

Oxygen

Iron

Silicon

17 / 50

Which of the followings are tri-atomic molecule except?

H2

CO2

H2O

O3

18 / 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 N2

1 mole of CO and 1 mole of CO2

1 mole of O2 and 1 mole of CO2

19 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Inorganic

Organic

Nuclear

20 / 50

Formula mass of K₂SO₄ is___________

145amu

174amu

180amu

110amu

21 / 50

80 percent elements are____________

Metals

None

Metalloids

Non-metals

22 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24) mg

1.66 x 10(-23)g

1.66.x10(-24)g

1.66 x 10(-24)kg

23 / 50

Atom is electrically______

Neutral

Negative

None

Positive

24 / 50

Example of covalent compound is _________

KCl

HCl

NaCl

KNO3

25 / 50

The mass of one molecule of water is________

18mg

18kg

18amu

18g

26 / 50

Valency of carbon is___________

2

1

3

4

27 / 50

The ratio of carbon and oxygen in CO₂ ________

1:8

2:3

3:8

1:2

28 / 50

Example of heterogeneous mixture is ___________

Air

gasoline

ice cream

Soil

29 / 50

The molar mass of H₂S0₄ is__________

98g

9.8amu

98amu

9.8g

30 / 50

Which one is polyatomic molecule?

H2 SO4

C6 H2 O6

All of these

C H4

31 / 50

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

53.12x10(-24)amu

1.92x10(-25)amu

192.64X10(-25)amu

32amu

32 / 50

Which one of following is an example of ionic compound?

H2O

NaCl

HCl

CH4

33 / 50

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

12.04 x 10(23)

6.20 x 10(24)

6.2 x 10(-23)

6.02 x 10(23)

34 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

CH

CHO

C H2 O

None of these

35 / 50

The most abundant element occurring in the oceans is_______

Nitrogen

Silicon

Oxygen

Hydrogen

36 / 50

Brass is a mixture of___________

Cu & Zn

Cu & Sn

Al & Fe

Cu & Al

37 / 50

Mixture can be separated by method_________

Physical

All of these

Nuclear

Chemical

38 / 50

Which one is extremely reactive species?

H2

N2+

CH3

Na

39 / 50

Mass of 3 moles of oxygen atoms is ___________

16g

32g

48g

64g

40 / 50

A piece of matter in pure form is termed as _________

Element

Mixture

Substance

Matter

41 / 50

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

Carbon monoxide

Nitrogen

Argon

Oxygen

42 / 50

1-gram formula of NaCl contains grams________

32g

58.5g

100g

49g

43 / 50

Empirical formula of sand is________

SiO4

SiO3

SiO2

Si2O3

44 / 50

Formation of which of the following is affected by light_________

Molecule

Free Radical

Atom

Ion

45 / 50

Valency of oxygen is___________

5

3

4

2

46 / 50

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

Radical

Mixture

Compound

Element

47 / 50

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

6.02x10(24)

1.66x10(-24)

3.01x10(23)

6.02x10(23)

48 / 50

Nuclear Chemistry has application in__________

Medical Treatment

Ecology

Agriculture

Metallurgy

49 / 50

1-gram atom of carbon contains how many moles is_________

6 moles

12mole

2mole

1mole

50 / 50

Which one is a physical property?

Hardness

Taste

Smell

All of these

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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