Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

The mass of one molecule of water is________

18mg

18amu

18g

18kg

2 / 50

The valency of Noble Gases is__________

Three

Two

One

Zero

3 / 50

1-gram formula of NaCl contains grams________

32g

49g

100g

58.5g

4 / 50

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

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

1 mole of NaCl and 1 mole of MgCl2

5 / 50

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of CO2

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of CO2

1 mole of O2 and 1 mole of N2

6 / 50

The molar mass of H₂S0₄ is__________

98g

98amu

9.8g

9.8amu

7 / 50

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

6.20 x 10(24)

6.02 x 10(23)

6.2 x 10(-23)

12.04 x 10(23)

8 / 50

Example of heterogeneous mixture is ___________

gasoline

Air

Soil

ice cream

9 / 50

Which one is extremely reactive species?

N2+

Na

CH3

H2

10 / 50

Example of covalent compound is _________

NaCl

KCl

HCl

KNO3

11 / 50

Elements may be_________

Gas

Solid

Liquid

All of these

12 / 50

Which one is polyatomic molecule?

C6 H2 O6

All of these

C H4

H2 SO4

13 / 50

Formation of which of the following is affected by light_________

Free Radical

Atom

Ion

Molecule

14 / 50

Which compound has same molecular and empirical formula?

C6 H6

C6 H12 O6

H2 O2

H2 O

15 / 50

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

1.66x10(-23)

6.02x10(24)

None of these

6.02x10(23)

16 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on micro scale

in the laboratory

on commercial scale

on economic scale

17 / 50

Example of mono atomic molecule is___________

CO2

H2

He

O2

18 / 50

Value of Avogadro number is________

6.00x10(24)

6.02x10(23)

6.6x10(-20)

1.32x10(23)

19 / 50

Valency of oxygen is___________

3

4

2

5

20 / 50

A piece of matter in pure form is termed as _________

Substance

Mixture

Element

Matter

21 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Organic

Inorganic

Nuclear

22 / 50

Which one of following is an example of ionic compound?

CH4

HCl

H2O

NaCl

23 / 50

Brass is a mixture of___________

Cu & Sn

Cu & Zn

Cu & Al

Al & Fe

24 / 50

Which one is a physical property?

Smell

All of these

Taste

Hardness

25 / 50

Valency of carbon is___________

2

4

3

1

26 / 50

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

1.66x10(-24)

6.02x10(23)

6.02x10(24)

3.01x10(23)

27 / 50

Formula mass of K₂SO₄ is___________

180amu

110amu

145amu

174amu

28 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

CHO

C H2 O

CH

29 / 50

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

Electron No

Atomic No

Mass Unit

Mass No

30 / 50

Percentage of Argon in nature is____________

21%

0.9%

47%

87%

31 / 50

Fourth state of matter is__________

Plasma

Liquid

Solid

Gas

32 / 50

Empirical formula of sand is________

SiO2

SiO4

Si2O3

SiO3

33 / 50

1-gram atom of carbon contains how many moles is_________

6 moles

2mole

1mole

12mole

34 / 50

Which type of molecular ions are present in plasma?

Both a & b

Anionic

Neutral

Cationic

35 / 50

Which of the followings are tri-atomic molecule except?

CO2

H2

O3

H2O

36 / 50

The most abundant element occurring in the oceans is_______

Nitrogen

Oxygen

Hydrogen

Silicon

37 / 50

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

Oxygen

Iron

Silicon

Aluminum

38 / 50

Mixture can be separated by method_________

Nuclear

Chemical

All of these

Physical

39 / 50

80 percent elements are____________

Metals

Non-metals

None

Metalloids

40 / 50

The ratio of carbon and oxygen in CO₂ ________

1:8

1:2

3:8

2:3

41 / 50

Atom is electrically______

None

Neutral

Negative

Positive

42 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24) mg

1.66 x 10(-23)g

1.66 x 10(-24)kg

1.66.x10(-24)g

43 / 50

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

0.18

0.24

0.15

0.21

44 / 50

Nuclear Chemistry has application in__________

Ecology

Medical Treatment

Metallurgy

Agriculture

45 / 50

Mass of 3 moles of oxygen atoms is ___________

64g

16g

48g

32g

46 / 50

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

Carbon monoxide

Argon

Nitrogen

Oxygen

47 / 50

Empirical formula of glucose is______

C H2 O

C2 HO

CHO

CHO2

48 / 50

40g of H₃PO₄ contains number of moles__________

5.8g

0.408g

0.58g

4.8g

49 / 50

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

192.64X10(-25)amu

1.92x10(-25)amu

32amu

53.12x10(-24)amu

50 / 50

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

Radical

Mixture

Element

Compound

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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