Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Brass is a mixture of___________

Cu & Al

Al & Fe

Cu & Sn

Cu & Zn

2 / 50

Nuclear Chemistry has application in__________

Medical Treatment

Agriculture

Ecology

Metallurgy

3 / 50

Mixture can be separated by method_________

Chemical

All of these

Physical

Nuclear

4 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

1:8

3:8

2:3

5 / 50

The most abundant element occurring in the oceans is_______

Oxygen

Nitrogen

Hydrogen

Silicon

6 / 50

Which compound has same molecular and empirical formula?

H2 O2

C6 H12 O6

H2 O

C6 H6

7 / 50

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

0.18

0.24

0.15

0.21

8 / 50

Example of mono atomic molecule is___________

O2

H2

He

CO2

9 / 50

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

Aluminum

Iron

Silicon

Oxygen

10 / 50

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

6.02 x 10(23)

12.04 x 10(23)

6.20 x 10(24)

6.2 x 10(-23)

11 / 50

Example of covalent compound is _________

KNO3

HCl

NaCl

KCl

12 / 50

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

Element

Radical

Compound

Mixture

13 / 50

40g of H₃PO₄ contains number of moles__________

0.408g

4.8g

0.58g

5.8g

14 / 50

80 percent elements are____________

Metalloids

None

Non-metals

Metals

15 / 50

The molar mass of H₂S0₄ is__________

9.8g

98amu

98g

9.8amu

16 / 50

Formula mass of K₂SO₄ is___________

110amu

174amu

145amu

180amu

17 / 50

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

1 mole of NaCl and 1 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

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

18 / 50

1-gram formula of NaCl contains grams________

32g

58.5g

100g

49g

19 / 50

Fourth state of matter is__________

Solid

Gas

Liquid

Plasma

20 / 50

Valency of carbon is___________

2

1

3

4

21 / 50

The valency of Noble Gases is__________

One

Two

Zero

Three

22 / 50

Example of heterogeneous mixture is ___________

Soil

ice cream

Air

gasoline

23 / 50

One amu (atomic mass unit) is equivalent to_______

1.66.x10(-24)g

1.66 x 10(-23)g

1.66 x 10(-24)kg

1.66 x 10(-24) mg

24 / 50

The mass of one molecule of water is________

18mg

18kg

18g

18amu

25 / 50

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

Electron No

Mass Unit

Atomic No

Mass No

26 / 50

Which one is polyatomic molecule?

C6 H2 O6

C H4

H2 SO4

All of these

27 / 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

28 / 50

Empirical formula of glucose is______

CHO

C2 HO

CHO2

C H2 O

29 / 50

A piece of matter in pure form is termed as _________

Substance

Mixture

Matter

Element

30 / 50

Value of Avogadro number is________

6.6x10(-20)

6.02x10(23)

6.00x10(24)

1.32x10(23)

31 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

CHO

C H2 O

CH

32 / 50

Which one of following is an example of ionic compound?

CH4

HCl

NaCl

H2O

33 / 50

Which one is a physical property?

All of these

Hardness

Smell

Taste

34 / 50

1-gram atom of carbon contains how many moles is_________

12mole

2mole

6 moles

1mole

35 / 50

Percentage of Argon in nature is____________

0.9%

47%

21%

87%

36 / 50

Elements may be_________

Liquid

Gas

All of these

Solid

37 / 50

Structure of atom is studied in which branch of chemistry?

Inorganic

Physical

Nuclear

Organic

38 / 50

Which one of the following pairs has the same mass?

1 mole of O2 and 1 mole of N2

1 mole of CO and 1 mole of CO2

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of CO2

39 / 50

Which of the followings are tri-atomic molecule except?

H2

O3

CO2

H2O

40 / 50

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

6.02x10(23)

1.66x10(-24)

6.02x10(24)

3.01x10(23)

41 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on micro scale

in the laboratory

on commercial scale

on economic scale

42 / 50

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

Carbon monoxide

Argon

Nitrogen

Oxygen

43 / 50

Empirical formula of sand is________

Si2O3

SiO3

SiO2

SiO4

44 / 50

Valency of oxygen is___________

3

2

4

5

45 / 50

Atom is electrically______

Negative

None

Positive

Neutral

46 / 50

Mass of 3 moles of oxygen atoms is ___________

16g

32g

64g

48g

47 / 50

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

53.12x10(-24)amu

32amu

192.64X10(-25)amu

1.92x10(-25)amu

48 / 50

Which one is extremely reactive species?

H2

N2+

Na

CH3

49 / 50

Which type of molecular ions are present in plasma?

Anionic

Both a & b

Neutral

Cationic

50 / 50

Formation of which of the following is affected by light_________

Atom

Free Radical

Ion

Molecule

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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