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?

12.04 x 10(23)

6.2 x 10(-23)

6.20 x 10(24)

6.02 x 10(23)

2 / 50

The ratio of carbon and oxygen in CO₂ ________

3:8

2:3

1:2

1:8

3 / 50

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

1.66x10(-23)

6.02x10(24)

6.02x10(23)

None of these

4 / 50

Empirical formula of glucose is______

C2 HO

CHO

CHO2

C H2 O

5 / 50

Formula mass of K₂SO₄ is___________

180amu

110amu

174amu

145amu

6 / 50

Elements may be_________

Gas

Liquid

All of these

Solid

7 / 50

A piece of matter in pure form is termed as _________

Substance

Element

Mixture

Matter

8 / 50

Fourth state of matter is__________

Plasma

Solid

Gas

Liquid

9 / 50

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

Atomic No

Mass No

Mass Unit

Electron No

10 / 50

Valency of oxygen is___________

4

2

5

3

11 / 50

1-gram formula of NaCl contains grams________

32g

49g

100g

58.5g

12 / 50

The most abundant element occurring in the oceans is_______

Hydrogen

Nitrogen

Oxygen

Silicon

13 / 50

Formation of which of the following is affected by light_________

Free Radical

Molecule

Atom

Ion

14 / 50

Valency of carbon is___________

1

2

3

4

15 / 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 mole of NaCl and 1 mole of MgCl2

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

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

16 / 50

Example of heterogeneous mixture is ___________

gasoline

ice cream

Air

Soil

17 / 50

Which one of following is an example of ionic compound?

H2O

HCl

NaCl

CH4

18 / 50

Which one is extremely reactive species?

CH3

N2+

Na

H2

19 / 50

Structure of atom is studied in which branch of chemistry?

Inorganic

Physical

Organic

Nuclear

20 / 50

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

Compound

Mixture

Radical

Element

21 / 50

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

192.64X10(-25)amu

53.12x10(-24)amu

32amu

1.92x10(-25)amu

22 / 50

Mixture can be separated by method_________

All of these

Physical

Nuclear

Chemical

23 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-23)g

1.66.x10(-24)g

1.66 x 10(-24)kg

1.66 x 10(-24) mg

24 / 50

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

1.66x10(-24)

6.02x10(23)

3.01x10(23)

6.02x10(24)

25 / 50

Which type of molecular ions are present in plasma?

Anionic

Both a & b

Neutral

Cationic

26 / 50

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

0.15

0.21

0.24

0.18

27 / 50

Which compound has same molecular and empirical formula?

C6 H12 O6

H2 O

C6 H6

H2 O2

28 / 50

Which one of the following pairs has the same mass?

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

1 mole of CO and 1 mole of CO2

29 / 50

Percentage of Argon in nature is____________

87%

0.9%

47%

21%

30 / 50

40g of H₃PO₄ contains number of moles__________

0.408g

4.8g

0.58g

5.8g

31 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

CH

CHO

None of these

C H2 O

32 / 50

Which one is polyatomic molecule?

C H4

All of these

C6 H2 O6

H2 SO4

33 / 50

80 percent elements are____________

Metalloids

Metals

Non-metals

None

34 / 50

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

Carbon monoxide

Nitrogen

Argon

Oxygen

35 / 50

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

Oxygen

Silicon

Iron

Aluminum

36 / 50

The molar mass of H₂S0₄ is__________

9.8amu

9.8g

98amu

98g

37 / 50

Atom is electrically______

Positive

Neutral

None

Negative

38 / 50

Example of mono atomic molecule is___________

CO2

H2

He

O2

39 / 50

Nuclear Chemistry has application in__________

Ecology

Metallurgy

Agriculture

Medical Treatment

40 / 50

Brass is a mixture of___________

Al & Fe

Cu & Sn

Cu & Al

Cu & Zn

41 / 50

Empirical formula of sand is________

Si2O3

SiO4

SiO3

SiO2

42 / 50

The mass of one molecule of water is________

18mg

18kg

18g

18amu

43 / 50

Value of Avogadro number is________

6.02x10(23)

6.00x10(24)

6.6x10(-20)

1.32x10(23)

44 / 50

Example of covalent compound is _________

KCl

NaCl

HCl

KNO3

45 / 50

Mass of 3 moles of oxygen atoms is ___________

48g

32g

16g

64g

46 / 50

Which of the followings are tri-atomic molecule except?

O3

H2

H2O

CO2

47 / 50

The valency of Noble Gases is__________

Three

Zero

One

Two

48 / 50

Which one is a physical property?

All of these

Smell

Taste

Hardness

49 / 50

1-gram atom of carbon contains how many moles is_________

12mole

6 moles

2mole

1mole

50 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on economic scale

on micro scale

in the laboratory

on commercial scale

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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