Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

3:8

2:3

1:8

2 / 50

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

Compound

Radical

Element

Mixture

3 / 50

The mass of one molecule of water is________

18mg

18g

18amu

18kg

4 / 50

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

32amu

53.12x10(-24)amu

192.64X10(-25)amu

1.92x10(-25)amu

5 / 50

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

1.66x10(-24)

3.01x10(23)

6.02x10(23)

6.02x10(24)

6 / 50

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

Nitrogen

Carbon monoxide

Oxygen

Argon

7 / 50

The valency of Noble Gases is__________

One

Zero

Three

Two

8 / 50

A piece of matter in pure form is termed as _________

Substance

Matter

Element

Mixture

9 / 50

Example of covalent compound is _________

KCl

KNO3

HCl

NaCl

10 / 50

40g of H₃PO₄ contains number of moles__________

5.8g

0.408g

0.58g

4.8g

11 / 50

Value of Avogadro number is________

6.02x10(23)

6.6x10(-20)

6.00x10(24)

1.32x10(23)

12 / 50

Mixture can be separated by method_________

All of these

Chemical

Physical

Nuclear

13 / 50

Which type of molecular ions are present in plasma?

Neutral

Both a & b

Anionic

Cationic

14 / 50

Fourth state of matter is__________

Liquid

Solid

Plasma

Gas

15 / 50

Formula mass of K₂SO₄ is___________

110amu

174amu

180amu

145amu

16 / 50

Mass of 3 moles of oxygen atoms is ___________

48g

32g

64g

16g

17 / 50

Which one of following is an example of ionic compound?

NaCl

H2O

HCl

CH4

18 / 50

Which compound has same molecular and empirical formula?

H2 O

C6 H12 O6

H2 O2

C6 H6

19 / 50

Which one is polyatomic molecule?

H2 SO4

C6 H2 O6

C H4

All of these

20 / 50

Formation of which of the following is affected by light_________

Atom

Free Radical

Molecule

Ion

21 / 50

Which one of the following pairs has the same mass?

1 mole of O2 and 1 mole of CO2

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 N2

22 / 50

Example of mono atomic molecule is___________

H2

CO2

He

O2

23 / 50

Valency of oxygen is___________

3

5

2

4

24 / 50

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

Mass No

Atomic No

Mass Unit

Electron No

25 / 50

Empirical formula of glucose is______

CHO2

C2 HO

CHO

C H2 O

26 / 50

Which of the followings are tri-atomic molecule except?

H2O

H2

CO2

O3

27 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Organic

Nuclear

Inorganic

28 / 50

Elements may be_________

Gas

All of these

Solid

Liquid

29 / 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 1/3 mole of MgCl2

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

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

30 / 50

Valency of carbon is___________

4

1

3

2

31 / 50

Example of heterogeneous mixture is ___________

Air

gasoline

Soil

ice cream

32 / 50

Which one is extremely reactive species?

N2+

Na

H2

CH3

33 / 50

Atom is electrically______

Positive

Negative

None

Neutral

34 / 50

The molar mass of H₂S0₄ is__________

98g

9.8g

9.8amu

98amu

35 / 50

Empirical formula of sand is________

Si2O3

SiO4

SiO2

SiO3

36 / 50

Which one is a physical property?

All of these

Taste

Hardness

Smell

37 / 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

38 / 50

80 percent elements are____________

Non-metals

Metals

None

Metalloids

39 / 50

Percentage of Argon in nature is____________

21%

87%

0.9%

47%

40 / 50

Brass is a mixture of___________

Al & Fe

Cu & Zn

Cu & Sn

Cu & Al

41 / 50

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

Aluminum

Silicon

Oxygen

Iron

42 / 50

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

None of these

6.02x10(24)

6.02x10(23)

1.66x10(-23)

43 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on economic scale

in the laboratory

on commercial scale

on micro scale

44 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

CHO

CH

C H2 O

45 / 50

1-gram formula of NaCl contains grams________

58.5g

100g

32g

49g

46 / 50

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

6.20 x 10(24)

6.2 x 10(-23)

6.02 x 10(23)

12.04 x 10(23)

47 / 50

The most abundant element occurring in the oceans is_______

Nitrogen

Hydrogen

Oxygen

Silicon

48 / 50

1-gram atom of carbon contains how many moles is_________

1mole

6 moles

12mole

2mole

49 / 50

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

0.18

0.21

0.24

0.15

50 / 50

Nuclear Chemistry has application in__________

Medical Treatment

Metallurgy

Ecology

Agriculture

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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