Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

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

0.15

0.21

0.24

0.18

2 / 50

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

Mass No

Atomic No

Electron No

Mass Unit

3 / 50

A piece of matter in pure form is termed as _________

Mixture

Matter

Substance

Element

4 / 50

Example of mono atomic molecule is___________

H2

CO2

O2

He

5 / 50

Percentage of Argon in nature is____________

87%

21%

0.9%

47%

6 / 50

Which of the followings are tri-atomic molecule except?

H2O

CO2

H2

O3

7 / 50

The mass of one molecule of water is________

18amu

18mg

18g

18kg

8 / 50

1-gram atom of carbon contains how many moles is_________

12mole

2mole

1mole

6 moles

9 / 50

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

53.12x10(-24)amu

192.64X10(-25)amu

32amu

1.92x10(-25)amu

10 / 50

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

Oxygen

Aluminum

Silicon

Iron

11 / 50

Which one is a physical property?

All of these

Hardness

Smell

Taste

12 / 50

Elements may be_________

Liquid

Gas

Solid

All of these

13 / 50

Formula mass of K₂SO₄ is___________

180amu

145amu

110amu

174amu

14 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

2:3

1:8

3:8

15 / 50

Which one of following is an example of ionic compound?

HCl

NaCl

CH4

H2O

16 / 50

Brass is a mixture of___________

Cu & Al

Cu & Zn

Al & Fe

Cu & Sn

17 / 50

Empirical formula of glucose is______

C2 HO

CHO

CHO2

C H2 O

18 / 50

Structure of atom is studied in which branch of chemistry?

Nuclear

Organic

Inorganic

Physical

19 / 50

Value of Avogadro number is________

6.00x10(24)

1.32x10(23)

6.02x10(23)

6.6x10(-20)

20 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24) mg

1.66 x 10(-24)kg

1.66.x10(-24)g

1.66 x 10(-23)g

21 / 50

Which type of molecular ions are present in plasma?

Both a & b

Anionic

Cationic

Neutral

22 / 50

Which one is extremely reactive species?

H2

N2+

Na

CH3

23 / 50

The molar mass of H₂S0₄ is__________

98g

9.8amu

9.8g

98amu

24 / 50

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of N2

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

25 / 50

1-gram formula of NaCl contains grams________

100g

49g

32g

58.5g

26 / 50

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

12.04 x 10(23)

6.02 x 10(23)

6.2 x 10(-23)

6.20 x 10(24)

27 / 50

Mass of 3 moles of oxygen atoms is ___________

48g

64g

16g

32g

28 / 50

Valency of carbon is___________

3

1

4

2

29 / 50

Nuclear Chemistry has application in__________

Metallurgy

Medical Treatment

Ecology

Agriculture

30 / 50

40g of H₃PO₄ contains number of moles__________

0.408g

0.58g

4.8g

5.8g

31 / 50

Example of covalent compound is _________

HCl

NaCl

KNO3

KCl

32 / 50

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

Mixture

Radical

Compound

Element

33 / 50

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

1.66x10(-23)

None of these

6.02x10(23)

6.02x10(24)

34 / 50

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

3.01x10(23)

1.66x10(-24)

6.02x10(24)

6.02x10(23)

35 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

CH

CHO

C H2 O

36 / 50

Empirical formula of sand is________

SiO3

Si2O3

SiO2

SiO4

37 / 50

Example of heterogeneous mixture is ___________

Air

ice cream

gasoline

Soil

38 / 50

Mixture can be separated by method_________

Physical

Nuclear

All of these

Chemical

39 / 50

Formation of which of the following is affected by light_________

Free Radical

Atom

Molecule

Ion

40 / 50

Which one is polyatomic molecule?

All of these

H2 SO4

C6 H2 O6

C H4

41 / 50

The most abundant element occurring in the oceans is_______

Oxygen

Silicon

Hydrogen

Nitrogen

42 / 50

80 percent elements are____________

Non-metals

Metalloids

Metals

None

43 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on economic scale

in the laboratory

on commercial scale

on micro scale

44 / 50

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

Nitrogen

Argon

Carbon monoxide

Oxygen

45 / 50

Fourth state of matter is__________

Solid

Liquid

Plasma

Gas

46 / 50

The valency of Noble Gases is__________

Three

Zero

One

Two

47 / 50

Which compound has same molecular and empirical formula?

C6 H6

H2 O2

C6 H12 O6

H2 O

48 / 50

Atom is electrically______

Positive

Neutral

None

Negative

49 / 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

50 / 50

Valency of oxygen is___________

4

2

3

5

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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