Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

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

Electron No

Mass Unit

Mass No

Atomic No

2 / 50

Structure of atom is studied in which branch of chemistry?

Organic

Inorganic

Nuclear

Physical

3 / 50

Valency of oxygen is___________

3

5

4

2

4 / 50

In which one of the following pairs has the same number of ions?

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

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

1 mole of NaCl and 1 mole of MgCl2

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

5 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

CH

CHO

C H2 O

6 / 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)

7 / 50

Which one is a physical property?

Smell

All of these

Taste

Hardness

8 / 50

Elements may be_________

Solid

Liquid

Gas

All of these

9 / 50

Value of Avogadro number is________

6.00x10(24)

1.32x10(23)

6.6x10(-20)

6.02x10(23)

10 / 50

Mass of 3 moles of oxygen atoms is ___________

32g

48g

16g

64g

11 / 50

Empirical formula of sand is________

SiO2

Si2O3

SiO4

SiO3

12 / 50

Nuclear Chemistry has application in__________

Medical Treatment

Metallurgy

Ecology

Agriculture

13 / 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)

14 / 50

Which compound has same molecular and empirical formula?

C6 H6

C6 H12 O6

H2 O2

H2 O

15 / 50

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

Element

Compound

Mixture

Radical

16 / 50

The most abundant element occurring in the oceans is_______

Nitrogen

Oxygen

Silicon

Hydrogen

17 / 50

Which of the followings are tri-atomic molecule except?

O3

H2O

H2

CO2

18 / 50

Formation of which of the following is affected by light_________

Ion

Free Radical

Molecule

Atom

19 / 50

Brass is a mixture of___________

Cu & Sn

Al & Fe

Cu & Zn

Cu & Al

20 / 50

Mixture can be separated by method_________

All of these

Nuclear

Physical

Chemical

21 / 50

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

53.12x10(-24)amu

1.92x10(-25)amu

32amu

192.64X10(-25)amu

22 / 50

Which one is extremely reactive species?

N2+

H2

CH3

Na

23 / 50

1-gram formula of NaCl contains grams________

100g

58.5g

49g

32g

24 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on commercial scale

on micro scale

on economic scale

in the laboratory

25 / 50

Atom is electrically______

Neutral

None

Positive

Negative

26 / 50

Fourth state of matter is__________

Solid

Gas

Liquid

Plasma

27 / 50

80 percent elements are____________

Metals

Metalloids

None

Non-metals

28 / 50

Percentage of Argon in nature is____________

47%

21%

0.9%

87%

29 / 50

Formula mass of K₂SO₄ is___________

180amu

145amu

174amu

110amu

30 / 50

Example of mono atomic molecule is___________

CO2

O2

H2

He

31 / 50

40g of H₃PO₄ contains number of moles__________

4.8g

0.58g

5.8g

0.408g

32 / 50

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

6.20 x 10(24)

12.04 x 10(23)

6.2 x 10(-23)

6.02 x 10(23)

33 / 50

Example of heterogeneous mixture is ___________

gasoline

Air

Soil

ice cream

34 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

1:8

3:8

2:3

35 / 50

Valency of carbon is___________

2

4

1

3

36 / 50

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

0.21

0.24

0.15

0.18

37 / 50

Which one of following is an example of ionic compound?

H2O

HCl

NaCl

CH4

38 / 50

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

Aluminum

Iron

Silicon

Oxygen

39 / 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

40 / 50

Which type of molecular ions are present in plasma?

Cationic

Neutral

Anionic

Both a & b

41 / 50

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

Argon

Carbon monoxide

Oxygen

Nitrogen

42 / 50

The mass of one molecule of water is________

18amu

18g

18kg

18mg

43 / 50

Which one is polyatomic molecule?

H2 SO4

C6 H2 O6

C H4

All of these

44 / 50

A piece of matter in pure form is termed as _________

Element

Matter

Mixture

Substance

45 / 50

Example of covalent compound is _________

KNO3

HCl

NaCl

KCl

46 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24)kg

1.66.x10(-24)g

1.66 x 10(-24) mg

1.66 x 10(-23)g

47 / 50

Empirical formula of glucose is______

C H2 O

CHO

C2 HO

CHO2

48 / 50

The valency of Noble Gases is__________

Two

Three

One

Zero

49 / 50

1-gram atom of carbon contains how many moles is_________

2mole

12mole

6 moles

1mole

50 / 50

The molar mass of H₂S0₄ is__________

9.8g

98g

98amu

9.8amu

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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