Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

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

1.66x10(-24)

3.01x10(23)

6.02x10(24)

6.02x10(23)

2 / 50

1-gram atom of carbon contains how many moles is_________

2mole

12mole

1mole

6 moles

3 / 50

Formula mass of K₂SO₄ is___________

110amu

174amu

180amu

145amu

4 / 50

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

Radical

Mixture

Element

Compound

5 / 50

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

6.2 x 10(-23)

12.04 x 10(23)

6.20 x 10(24)

6.02 x 10(23)

6 / 50

A piece of matter in pure form is termed as _________

Mixture

Matter

Substance

Element

7 / 50

Which compound has same molecular and empirical formula?

H2 O

H2 O2

C6 H12 O6

C6 H6

8 / 50

Example of covalent compound is _________

KCl

KNO3

HCl

NaCl

9 / 50

Which of the followings are tri-atomic molecule except?

H2O

H2

O3

CO2

10 / 50

Percentage of Argon in nature is____________

21%

87%

0.9%

47%

11 / 50

Formation of which of the following is affected by light_________

Atom

Ion

Free Radical

Molecule

12 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Organic

Nuclear

Inorganic

13 / 50

Atom is electrically______

Neutral

None

Negative

Positive

14 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on micro scale

on commercial scale

in the laboratory

on economic scale

15 / 50

Nuclear Chemistry has application in__________

Agriculture

Medical Treatment

Metallurgy

Ecology

16 / 50

Valency of oxygen is___________

4

2

3

5

17 / 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

18 / 50

Empirical formula of sand is________

SiO3

SiO2

Si2O3

SiO4

19 / 50

The most abundant element occurring in the oceans is_______

Nitrogen

Hydrogen

Silicon

Oxygen

20 / 50

1-gram formula of NaCl contains grams________

100g

49g

58.5g

32g

21 / 50

Mass of 3 moles of oxygen atoms is ___________

48g

16g

32g

64g

22 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

1:8

2:3

3:8

23 / 50

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

Oxygen

Aluminum

Silicon

Iron

24 / 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

25 / 50

Value of Avogadro number is________

1.32x10(23)

6.00x10(24)

6.6x10(-20)

6.02x10(23)

26 / 50

Fourth state of matter is__________

Liquid

Gas

Solid

Plasma

27 / 50

The mass of one molecule of water is________

18kg

18g

18mg

18amu

28 / 50

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

Mass Unit

Electron No

Mass No

Atomic No

29 / 50

Which one is polyatomic molecule?

C H4

All of these

H2 SO4

C6 H2 O6

30 / 50

Which type of molecular ions are present in plasma?

Cationic

Anionic

Neutral

Both a & b

31 / 50

40g of H₃PO₄ contains number of moles__________

4.8g

5.8g

0.408g

0.58g

32 / 50

Which one is a physical property?

All of these

Taste

Smell

Hardness

33 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-23)g

1.66 x 10(-24) mg

1.66 x 10(-24)kg

1.66.x10(-24)g

34 / 50

Valency of carbon is___________

4

3

1

2

35 / 50

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

0.21

0.24

0.18

0.15

36 / 50

Mixture can be separated by method_________

All of these

Chemical

Physical

Nuclear

37 / 50

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of CO2

1 mole of O2 and 1 mole of CO2

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of N2

38 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

CHO

CH

C H2 O

None of these

39 / 50

Brass is a mixture of___________

Cu & Al

Cu & Zn

Cu & Sn

Al & Fe

40 / 50

80 percent elements are____________

Non-metals

Metalloids

None

Metals

41 / 50

Example of mono atomic molecule is___________

CO2

H2

O2

He

42 / 50

Which one is extremely reactive species?

H2

CH3

N2+

Na

43 / 50

Which one of following is an example of ionic compound?

CH4

HCl

H2O

NaCl

44 / 50

The molar mass of H₂S0₄ is__________

9.8g

98amu

9.8amu

98g

45 / 50

Example of heterogeneous mixture is ___________

Soil

Air

ice cream

gasoline

46 / 50

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

1.92x10(-25)amu

32amu

192.64X10(-25)amu

53.12x10(-24)amu

47 / 50

Elements may be_________

Liquid

All of these

Gas

Solid

48 / 50

Empirical formula of glucose is______

CHO2

CHO

C2 HO

C H2 O

49 / 50

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

Oxygen

Nitrogen

Carbon monoxide

Argon

50 / 50

The valency of Noble Gases is__________

Two

Zero

One

Three

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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