Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Value of Avogadro number is________

6.02x10(23)

1.32x10(23)

6.00x10(24)

6.6x10(-20)

2 / 50

40g of H₃PO₄ contains number of moles__________

5.8g

0.408g

0.58g

4.8g

3 / 50

Fourth state of matter is__________

Solid

Liquid

Plasma

Gas

4 / 50

Valency of carbon is___________

4

1

3

2

5 / 50

Structure of atom is studied in which branch of chemistry?

Nuclear

Organic

Inorganic

Physical

6 / 50

Nuclear Chemistry has application in__________

Agriculture

Ecology

Medical Treatment

Metallurgy

7 / 50

Which type of molecular ions are present in plasma?

Cationic

Both a & b

Neutral

Anionic

8 / 50

The mass of one molecule of water is________

18amu

18g

18kg

18mg

9 / 50

Example of heterogeneous mixture is ___________

ice cream

Soil

gasoline

Air

10 / 50

Brass is a mixture of___________

Cu & Sn

Cu & Zn

Al & Fe

Cu & Al

11 / 50

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

Radical

Mixture

Element

Compound

12 / 50

Mass of 3 moles of oxygen atoms is ___________

16g

48g

64g

32g

13 / 50

Mixture can be separated by method_________

All of these

Nuclear

Physical

Chemical

14 / 50

1-gram atom of carbon contains how many moles is_________

1mole

12mole

6 moles

2mole

15 / 50

A piece of matter in pure form is termed as _________

Element

Substance

Mixture

Matter

16 / 50

Example of mono atomic molecule is___________

CO2

O2

H2

He

17 / 50

Atom is electrically______

Neutral

Positive

Negative

None

18 / 50

Formula mass of K₂SO₄ is___________

145amu

174amu

180amu

110amu

19 / 50

Formation of which of the following is affected by light_________

Atom

Free Radical

Molecule

Ion

20 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

C H2 O

CHO

None of these

CH

21 / 50

Elements may be_________

Solid

All of these

Liquid

Gas

22 / 50

Valency of oxygen is___________

5

3

4

2

23 / 50

Example of covalent compound is _________

NaCl

KCl

HCl

KNO3

24 / 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 mole of NaCl and 1 mole of MgCl2

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

25 / 50

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

0.18

0.24

0.21

0.15

26 / 50

Empirical formula of sand is________

SiO4

SiO2

Si2O3

SiO3

27 / 50

Which one of the following pairs has the same mass?

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

1 mole of CO and 1 mole of CO2

28 / 50

The ratio of carbon and oxygen in CO₂ ________

2:3

1:2

3:8

1:8

29 / 50

Which one is polyatomic molecule?

H2 SO4

C H4

All of these

C6 H2 O6

30 / 50

Which of the followings are tri-atomic molecule except?

H2

H2O

O3

CO2

31 / 50

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

Aluminum

Silicon

Oxygen

Iron

32 / 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

33 / 50

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

6.02 x 10(23)

6.20 x 10(24)

6.2 x 10(-23)

12.04 x 10(23)

34 / 50

Empirical formula of glucose is______

C H2 O

CHO2

C2 HO

CHO

35 / 50

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

Mass Unit

Electron No

Mass No

Atomic No

36 / 50

The most abundant element occurring in the oceans is_______

Silicon

Hydrogen

Oxygen

Nitrogen

37 / 50

Percentage of Argon in nature is____________

21%

87%

47%

0.9%

38 / 50

1-gram formula of NaCl contains grams________

100g

32g

49g

58.5g

39 / 50

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

Argon

Carbon monoxide

Oxygen

Nitrogen

40 / 50

Which one of following is an example of ionic compound?

HCl

NaCl

H2O

CH4

41 / 50

Which compound has same molecular and empirical formula?

C6 H12 O6

H2 O2

C6 H6

H2 O

42 / 50

Which one is extremely reactive species?

CH3

Na

N2+

H2

43 / 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)

44 / 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

45 / 50

Which one is a physical property?

Hardness

All of these

Taste

Smell

46 / 50

The molar mass of H₂S0₄ is__________

9.8g

9.8amu

98g

98amu

47 / 50

80 percent elements are____________

Non-metals

Metalloids

None

Metals

48 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24)kg

1.66 x 10(-24) mg

1.66.x10(-24)g

1.66 x 10(-23)g

49 / 50

The valency of Noble Gases is__________

One

Three

Two

Zero

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