Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Elements may be_________

Liquid

Gas

All of these

Solid

2 / 50

Which one is extremely reactive species?

CH3

N2+

Na

H2

3 / 50

Example of covalent compound is _________

HCl

KCl

KNO3

NaCl

4 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on micro scale

on economic scale

in the laboratory

on commercial scale

5 / 50

Fourth state of matter is__________

Gas

Solid

Liquid

Plasma

6 / 50

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

6.02x10(23)

6.02x10(24)

1.66x10(-24)

3.01x10(23)

7 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-23)g

1.66 x 10(-24)kg

1.66 x 10(-24) mg

1.66.x10(-24)g

8 / 50

40g of H₃PO₄ contains number of moles__________

5.8g

0.58g

4.8g

0.408g

9 / 50

A piece of matter in pure form is termed as _________

Substance

Element

Mixture

Matter

10 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

CHO

None of these

C H2 O

CH

11 / 50

80 percent elements are____________

None

Metalloids

Metals

Non-metals

12 / 50

Brass is a mixture of___________

Cu & Sn

Cu & Zn

Al & Fe

Cu & Al

13 / 50

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

Radical

Mixture

Element

Compound

14 / 50

Mixture can be separated by method_________

Nuclear

Physical

All of these

Chemical

15 / 50

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

Nitrogen

Argon

Oxygen

Carbon monoxide

16 / 50

Empirical formula of sand is________

Si2O3

SiO3

SiO2

SiO4

17 / 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 N2

1 mole of O2 and 1 mole of CO2

1 mole of CO and 1 mole of CO2

18 / 50

The valency of Noble Gases is__________

Three

One

Two

Zero

19 / 50

The ratio of carbon and oxygen in CO₂ ________

2:3

1:2

1:8

3:8

20 / 50

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

Mass Unit

Mass No

Atomic No

Electron No

21 / 50

Example of mono atomic molecule is___________

H2

He

O2

CO2

22 / 50

Atom is electrically______

Neutral

Positive

Negative

None

23 / 50

1-gram formula of NaCl contains grams________

100g

58.5g

32g

49g

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 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

25 / 50

Which one is a physical property?

Hardness

Smell

All of these

Taste

26 / 50

Example of heterogeneous mixture is ___________

Air

Soil

gasoline

ice cream

27 / 50

Which one of following is an example of ionic compound?

H2O

HCl

CH4

NaCl

28 / 50

The molar mass of H₂S0₄ is__________

98g

9.8amu

98amu

9.8g

29 / 50

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

Silicon

Iron

Oxygen

Aluminum

30 / 50

Which type of molecular ions are present in plasma?

Neutral

Anionic

Cationic

Both a & b

31 / 50

Percentage of Argon in nature is____________

87%

0.9%

21%

47%

32 / 50

Which compound has same molecular and empirical formula?

H2 O2

C6 H12 O6

C6 H6

H2 O

33 / 50

Mass of 3 moles of oxygen atoms is ___________

48g

32g

16g

64g

34 / 50

Value of Avogadro number is________

6.00x10(24)

6.6x10(-20)

1.32x10(23)

6.02x10(23)

35 / 50

Valency of carbon is___________

4

2

1

3

36 / 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

37 / 50

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

0.21

0.24

0.18

0.15

38 / 50

Empirical formula of glucose is______

C2 HO

CHO

CHO2

C H2 O

39 / 50

Formula mass of K₂SO₄ is___________

174amu

180amu

110amu

145amu

40 / 50

Nuclear Chemistry has application in__________

Agriculture

Ecology

Medical Treatment

Metallurgy

41 / 50

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

6.02x10(23)

None of these

6.02x10(24)

1.66x10(-23)

42 / 50

Which one is polyatomic molecule?

H2 SO4

All of these

C6 H2 O6

C H4

43 / 50

Structure of atom is studied in which branch of chemistry?

Organic

Nuclear

Inorganic

Physical

44 / 50

Formation of which of the following is affected by light_________

Free Radical

Ion

Molecule

Atom

45 / 50

Which of the followings are tri-atomic molecule except?

H2

H2O

CO2

O3

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)

12.04 x 10(23)

6.02 x 10(23)

47 / 50

1-gram atom of carbon contains how many moles is_________

2mole

12mole

1mole

6 moles

48 / 50

Valency of oxygen is___________

3

2

5

4

49 / 50

The mass of one molecule of water is________

18kg

18mg

18amu

18g

50 / 50

The most abundant element occurring in the oceans is_______

Oxygen

Silicon

Nitrogen

Hydrogen

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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